Nat report

,

SIX WEEKS INDUSTRIAL TRAINING
REPORT
On
“CCNA”

In partial fulfillment of the degree of Bachelor of Technology in Electronics and
communication Engineering

AT

“NETMAX TECHNOLOGIES PATIALA”

Submitted to

Guided by Submitted by
Mr. Barinder Singh

DEPARTMENT OF ELECTRONICS AND COMMUNICATION
ENGINEERING
RIMT-INSTITUTE OF ENGINEERING AND TECHNOLOGY
MANDI GOBINDGARH-147301
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ACKNOWLEDGEMENT

While presenting this report I would like to express my deep sense of gratitude to entire

NETMAX staff that were indispensable part of my training giving me unending guidance,

inspiration, encouragement and providing me excellent environment throughout my training at

NETMAX TECHNOLOGIES. The training was an extremely productive & enriching

experience, not only technically but also from providing some practical skills.

I am extremely thankful to Mr.Barinder Singh who had devoted a lot of time in guiding and

supervising me during my training.

I must place my gratitude towards Prof. Rajneesh Talwar (H.O.D. of E.C.E. Dept.) for their

valuable advice and guidance in carrying out this enjoyable and productive experience, which

provided me a great opportunity to search new horizons.

Ashima Malhotra

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PREFACE

Technology has rapidly grown in past two-three decades. An engineer without practical
knowledge and skills cannot survive in this technical era. Theoretical knowledge does matter but
it is the practical knowledge that is the difference between the best and the better. Organizations
also prefer experienced engineers than fresher ones due to practical knowledge and industrial
exposure of the former. The practical training is highly conductive for solid foundation for:-

1. Knowledge and personality

2. Exposure to industrial environment.

3. Confidence building.

4. Enhancement of creativity.

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TABLE OF CONTENTS

Sr. No. DESCRIPTION PAGE NO.

1. COMPANY PROFILE 32

2. INTRODUCTION TO CCNA 35

3. BASIC 35

4. IP ADDRESS V4 49

5. IP ROUTING 51

6. LAN SWITCHING 63

7. ACL 68

8. NAT 72

9. PROJECT 76

10. REFERCENCES 83

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INTRODUCTION

NETMAX TECHNOLOGIES,
SCO 52, 2ND FLOOR LEELA BHAWAN PATIALA .

COMPANY PROFILE

NETMAX TECHNOLOGIES as an organization is established in 2001 in the field of Network
Support, Network training, Software training and Embedded systems.
In Education, we have strategic alliance with Pearson VUE and Prometric. We are authorized
Testing Partner of REDHAT & CISCO. We are also NOVELL EDUCATION PARTNER with
which we provide NOVELL and SUSE LINUX courses. NetMax Technologies also conduct
courses in CADENCE based design tools.

NETMAX TECHNOLOGIES also provide Technical Research & Development support and
consultancy to some electronics companies.
Our clients for R&D support in field of embedded systems:
 Recorders and Medicare Ltd Chandigarh.
 TELEBOX India Ltd.
 Lotus Machines Pvt. Ltd. Chandigarh.
 Impearl Electronics Pvt. Ltd. Chandigarh.
 KANTA Electrical Ltd. Mohali.

The partial list of our client for network field is as below:
 CEDTI, Mohali
 Premier ISP, Chandigarh
 Innovative solutions, Chandigarh
 Emmtel ISP, Chandigarh
 NIPER, Mohali
 Navik Technologies, Chandigarh
 Software Technology Parks India, Mohali
 Glide Internet Services
 Rana Group
 IDS
 HFCL Infotel Ltd.
 Targus Technologies Pvt Ltd
 STPI, Mohali
 BBMB
 The Tribune

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 Ind Swift

OUR TEAM

We are a strong technical team of certified professionals for catering to these solutions and have
presence in Chandigarh and Punjab. We have skilled team of engineers who are experienced in
design, programming. We are having more than 15 engineers who are having prestigious
certifications like CCNA, CCNP, CCSP, CCSA, MCSE, RHCE,C++,C,JAVA & PhP, MySql
Programming.

Support Area (network solutions):
 LINUX / UNIX networks
 SUN networks
 CISCO devices (Routers, Switches, Firewalls, Cache Engine, RAS etc)
 Bandwidth Manager software and hardware
 Radio Links
 Security Solutions

NETMAX TECHNOLOGIES provide the following Courses in IT & Embedded Systems given
below:

Network Training:
 CISCO CCNA, CCNP
 RED HAT LINUX 5
 WINDOWS 2000, 2003 (MCP,MCSA & MCSE)
 MCITP 2008.

Software Training:
 C++
 C
 JAVA ( CORE JAVA & ADVANCE JAVA)
 ASP.NET
 PHP My sql Programming.

We provide Technical support and consultancy to electronics companies in the field
of Embedded micro controllers like 8 bit and 16 bit family based embedded system design,
analog systems design(including signal conditioning circuits, filter design, etc) ,precision signal
amplifier design for applications like ECG, low power design, precision temperature
measurement etc .Power electronics including dc/dc converters, ac/dc converters,thyristor firing
based circuit, battery charging and monitor circuits etc. Application of Embedded systems and
analog control systems in industrial as well as home automation.
Our core strengths are our commitment, technical expertise and cost effective solutions.
We ensure high service levels and prompt support availability leading to lower downtime.

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NETMAX TECHNOLOGIES is a leader in education services and developer of innovative
embedded solutions. To meet the demands of Post PC era, NeTmax provides complete solutions
as well as design-to-order services to satisfy our customers.

NETMAX TECHNOLOGIES:

 BARINDER SINGH, 9914713373
 HARPREET SINGH, 9814900118

HEAD OFFICE:

NETMAX TECHNOLOGIES, SCO 58-59, Sector 34A, Chandigarh.
0172-4644644

Branch Office:

NETMAX TECHNOLOGIES, SCO 52 2ND FLOOR LEELA BHAWAN PATIALA.
0175- 5018351,9914713373, 9814900118.

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INTRODUCTION TO CCNA

What is Network?

In one network more than one computer connected with each other through centralized device.
They can share files and resources with each other.
LAN
LAN stands for Local Area Network. The scope of the LAN is within one building, one school
or within one lab. In LAN (Hub), media access method is used CSMA/CD in which each
computer sense the carrier before sending the data over the n/w. if carrier is free then you can
transmit otherwise you have to wait or you have to listen. In multiple access each computer have
right that they can access each other. If two computers sense the carrier on same time then the
collision occur. Each computer, in the network, aware about the collision. Now this stop
transmitting and they will use back off algorithm. In which random number is generated. This
number or algorithm is used by each computer. Who has short number or small number, he has
first priority to transmit the data over the network and other computers will wait for their turn.
WAN
WAN stands for Wide Area Network, in which two local area networks are connected through
public n/w. it may be through telecommunication infrastructure or dedicated lines. For e.g: -
ISDN lines, Leased lines etc.
In which we can use WAN devices and WAN technology. You can also connect with your
remote area through existing Internetwork called Internet.

Devices
Hub
Hub is centralized device, which is used to connect multiple workstations. There are two types of
Hub: -
(i) Active Hub
(ii) Passive Hub

it has no special kind of memory. It simply receives the frame (data) and forwards it to all its
nodes except the receiving node. It always performs broadcasting. In case of hub, there is one
collision domain and one broadcast domain. In case of hub, the media access method is used
CSMA/CD (Carrier Sense Multiple Access/Collision Detection).

(i) Active Hub
In Active hub, it receives the frame regenerate and then forward to all its nodes.
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(ii) Passive Hub
In Passive hub, it simply receives the frame and forward to all its connected nodes.

You cannot perform LAN segmentation using hub.

Switch
Switch is also used to connect multiple workstations. Switch is more intelligent than hub. It has
special kind of memory called mac address/filter/lookup table. Switch reads mac addresses.
Switch stores mac addresses in its filter address table. Switch when receives frame, it reads the
destination mac address and consult with its filter table. If he has entry in its filter table then he
forwards the frame to that particular mac address, if not found then it performs broadcasting to
all its connected nodes.
Every port has its own buffer memory. A port has two queues one is input queue and
second is output queue. When switch receives the frame, the frame is received in input queue and
forward from output queue. So in case of switch there is no chance or place for collisions. In case
of switch, the media access method is used CSMA/CA (Carrier Sense Multiple Access/ Collision
Avoidance). Switches provide more efficiency, more speed and security.
There are two types of switches: -
(i) Manageable switches (can be configured with console cable).
(ii) Non-manageable switches.
We can perform LAN segmentation by using switches.
Bridge
Bridge is a hardware device, which is used to provide LAN segmentation means it is used for
break the collision domain. It has same functionality as performed by switch. We can use bridge
between two different topologies. It has fewer ports. Each port has a own buffer memory. It
works on Data Link Layer of OSI model. It also read mac address and stores it in its filter table.
In case of bridge there is one broadcast domain.
Router
Router is hardware device, which is used to communicate two different networks. Router
performs routing and path determination. It does not perform broadcast information. There are
two types of routers: -
(i) Hardware Routers are developed by Cisco, HP.
(ii) Software Routers is configured with the help of routing and remote access. This feature is
offered by Microsoft. This feature is by default installed, but you have to enable or configure it.
Hardware routers are dedicated routers. They are more efficient.
But in case of software routers, it has less features, slow performance. They are not very much
efficient.

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Lan Card
Lan card is media access device. Lan card provide us connectivity in the network. There is a
RJ45 (Registered Jack) connector space on the Lan card. RJ45 is used in UTP cable. There is
another led which is also called heartbeat of Lan card. When any activity occur it may be
receiving or transmitting any kind of data. This led start blinking and also tell us the status of lan
card.

LAN Topologies

BUS Topology

Cable Type – Coaxial
Connector Type – BNC (Bayonet Neill-Concelman), T type, Terminator
Coaxial – Thick Maximum length – 500 meters
N/w devices 100
Coaxial – Thin Maximum length – 185 meters
N/w devices 30

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Star Topology
Cable type - UTP
Connector type - RJ45
Maximum Length – 100 meters (with proper color coding)

UTP (Unshielded Twisted Pair)

STP (Shielded Twisted Pair)

In case of hub media access method will be CSMA/CD.

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Ring Topology
Cable - UTP

There is token ring method used, so there is no collision chance.

Ethernet Family

Speed Base band
10 Base 2 200-meter Coaxial cable
10 Base 5 500-meter Thick Coaxial cable
10 Base T 100 meter Twisted Pair (UTP)
10/100(present) Base TX 100 meter UTP
100 Base T4 100 meter UTP 4 Pairs used
100 Base FX up to 4 kms Fiber Optic
1000(Server) Base TX 100 meter UTP
1000 Base FX up to 10 kms Fiber Optic
10000 Base FX Fiber Optic

Color
Green – Green white
Orange – Orange white
Blue – Blue white
Brown – Brown white

Green cable has maximum twists.

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Pin Configuration

Cross Straight
1 3 1 1
2 6 2 2
3 1 3 3
6 2 6 6

Straight Cable
1 Orange white - Orange white
2 Orange - Orange
3 Green white - Green white
4 Blue - Blue
5 Blue white - Blue white
6 Green - Green
7 Brown white - Brown white
8 Brown - Brown

Cross Cable
1 Orange white - Green white
2 Orange - Green
3 Green white - Orange white
4 Blue - Blue
5 Blue white - Blue white
6 Green - Orange
7 Brown white - Brown white
8 Brown - Brown

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RJ45 Connector

OSI (Open Systems Interconnection) Model
OSI model is the layer approach to design, develop and implement network. OSI provides
following advantages: -
(i) Designing of network will be standard base.
(ii) Development of new technology will be faster.
(iii) Devices from multiple vendors can communicate with each other.
(iv) Implementation and troubleshooting of network will be easy.

(1) Application Layer: -
Application layer accepts data and forward into the protocol stack. It creates user
interface between application software and protocol stack.

(2) Presentation Layer: -
This layer decides presentation format of the data. It also able to performs other function
like compression/decompression and encryption/decryption.

(3) Session Layer: -
This layer initiate, maintain and terminate sessions between different applications. Due to
this layer multiple application software can be executed at the same time.

(4) Transport Layer: -
Transport layer is responsible for connection oriented and connection less
communication. Transport layer also performs other functions like
a. Error checking
b. Flow Control
Buffering
Windowing
Multiplexing
c. Sequencing
d. Positive Acknowledgement
e. Response

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(5) Network Layer

This layer performs function like logical addressing and path determination. Each
networking device has a physical address that is MAC address. But logical addressing is
easier to communicate on large size network.

Logical addressing defines network address and host address. This type of addressing is
used to simplify implementation of large network. Some examples of logical addressing
are: - IP addresses, IPX addresses etc.

(6) Data Link Layer

The functions of Data Link layer are divided into two sub layers
a. Logical Link Control
b. Media Access Control

(i) Logical Link Control defines the encapsulation that will be used by the NIC to
delivered data to destination. Some examples of Logical Link Control are
ARPA (Ethernet), 802.11 wi-fi.
(ii) Media Access Control defines methods to access the shared media and
establish the identity with the help of MAC address. Some examples of Media
Access Control are CSMA/CD, Token Passing.

(7) Physical Layer

Physical Layer is responsible to communicate bits over the media this layer deals with the
standard defined for media and signals. This layer may also perform modulation and
demodulation as required.

Router Architecture

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LAN
Processor
I/O
Controlle WAN
r
Memory
Controller RAM

BIOS
ROM Flash
RAM
Incomplete O/S
IOS
IOS
NVRAM

Startup Configuration

Non-Volatile
RAM

Router Access Modes

When we access router command prompt the router will display different modes. According to
the modes, privileges and rights are assigned to the user.

User mode

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In this mode, we can display basic parameter and status of the router we can test connectivity and
perform telnet to other devices. In this mode we are not enable to manage & configure router.

Privileged mode

In this mode, we can display all information, configuration, perform administration task,
debugging, testing and connectivity with other devices. We are not able to perform here
configuration editing of the router.
The command to enter in this mode is ‘enable’. We have to enter enable password
or enable secret password to enter in this mode. Enable secret has more priority than enable
password. If both passwords are configured then only enable secret will work.

Global configuration

This mode is used for the configuration of global parameters in the router. Global parameters
applied to the entire router.
For e.g: - router hostname or access list of router
The command enter in this mode is ‘configure terminal’.

Line configuration mode

This mode is used to configure lines like console, vty and auxiliary. There are main types of line
that are configured.
(i) Console
router(config)#line console 0

(ii) Auxiliary
router(config)#line aux 0

(iii) Telnet or vty
router(config)#line vty 0 4

Interface configuration mode

This mode is used to configure router interfaces. For e.g:- Ethernet, Serial, BRI etc.
Router(config)#interface <type> <number>
Router(config)#interface serial 1

Routing configuration mode

This mode is used to configure routing protocol like RIP, EIGRP, OSPF etc.

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Router(config)#router <protocol> [<option>]
Router(config)#router rip
Router(config)#router eigrp 10

Configuring Password

There are five types of password available in a router

(1) Console Password
router#configure terminal
router(config)#line console 0
router(config-line)#password <word>
router(config-line)#login
router(config-line)#exit

to erase password do all steps with no command.

(2) Vty Password
router>enable
router(config)#line vty 0 4

(3) Auxiliary Password
router(config)#line Aux 0

(4) Enable Password
router>enable
router(config)#enable password <word>
router(config)#exit

(5) Enable Secret Password
Enable Password is the clear text password.

Router>enable
Router#configure terminal
Router(config)#enable secret <word>
Router(config)#exit

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Encryption all passwords

All passwords other than enable secret password are clear text password. We can encrypt all
passwords using level 7 algorithm. The command to encrypt all password are

Router(config)#service password-encryption

Managing Configuration

There are two types of configuration present in a router
(1) Startup Configuration
(2) Running Configuration

(1) Startup configuration is stored in the NVRAM. Startup configuration is used to save settings
in a router. Startup configuration is loaded at the time of booting in to the Primary RAM.

(2) Running Configuration is present in the Primary RAM wherever we run a command for
configuration, this command is written in the running configuration.

To save configuration

Router#copy running-configuration startup-configuration
Or
Router#write

To display running-configuration

Router#show running-configuration

To display startup configuration

Router#show startup-configuration

To erase old configuration

Router#erase startup-configuration
Configuring HostName

Router#hostname <name>
<name>#exit or end or /z

Configuration Interfaces

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Interfaces configuration is one of the most important part of the router configuration. By default,
all interfaces of Cisco router are in disabled mode. We have to use different commands as our
requirement to enable and configure the interface.

Configuring IP, Mask and Enabling the Interface

Router(config)#interface <type> <no>
Router(config-if)#ip address <ip> <mask>
Router(config-if)#no shutdown
Router(config-if)#exit

To configure Interface description

Router(config-if)#description <line>

To display interface status

Router#show interfaces (to show all interfaces)
Router#show interface <type> <no>

This command will display following parameters about an interface
1) Status
2) Mac address
3) IP address
4) Subnet mask
5) Hardware type / manufacturer
6) Bandwidth
7) Reliability
8) Delay
9) Load ( Tx load
Rx load)
10) Encapsulation
11) ARP type (if applicable)
12) Keep alive

Configuring secondary IP

Router#config terminal
Router(config-if)#IP address 192.168.10.5 255.255.255.0
Router(config-if)#IP address 192.168.10.18 255.255.255.0 secondary
Router(config-if)#no shutdown (to enable the interface because they always shutdown)

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Router#show run (to display secondary IP)

To display commands present in history

Router#show history

To display history size

Router#show terminal

Configuring Banners

Banners are just a message that can appear at different prompts according to the type. Different
banners are: -

Message of the day (motd)
This banner appear at every access method

IP Address v4

IP address is a 32-bit address. It is divided into four octets. Each octet has 8 bits. It has two parts
one is network address and second is host address. in local area network, we can used private IP
address, which is provided by IANA (Internet Assigning Numbering Authority). IP addresses are
divided into five classes.

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Class Range N/w bits Host bits Subnet mask Total IP Valid IP
A 1 – 126 8 24 255.0.0.0 16777216 16777214
B 128 – 191 16 16 255.255.0.0 65536 65534
C 192 – 223 24 8 255.255.255.0 256 254
D 224 – 239 it is reserved for multicast.
E 240 – 255 it is reserved for research/scientific use.

We can use first three classes. IANA provides private IP addresses from first three classes.

Class Private IP Range
A 10.0.0.0 – 10.255.255.255
B 172.16.0.0 – 172.31.255.255
C 192.168.0.0 – 192.168.255.255

Subnet Mask
Subnet mask is also 32-bit address, which tell us how many bits are used for network and how
many bits are used for host address.
In Subnet mask Network bits are always 1 and Host bits are always 0.

IP Addresses invalid or reserve IP Addresses
When we are going to assign IP addresses to our computers then we have to follow some rules.
Rules: -
(1) All Host bits cannot be 0 (10.0.0.0), because it represent network address which is reserved
for router.
(2) All Host bits cannot be 1 (10.255.255.255), because this is broadcast address of that network
(10th network).
(3) All bits cannot be 0 (0.0.0.0), because this address is reserved for Default routing. Default
routing is used in case of Stub n/w (means our network has one exit point).
(4) All bits cannot be 1 (255.255.255.255), because this is reserved for Broadcasting.
(5) 127.0.0.1 - This is Loopback address, which is used for self-communication or
troubleshooting purpose.
C:>ipconfig
C:>ipconfig/all

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It shows all detail.

IP Routing
When we want to connect two or more networks using different n/w addresses then we have to
use IP Routing technique. The router will be used to perform routing between the networks. A
router will perform following functions for routing.
(1) Path determination
(2) Packet forwarding

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(1) Path determination
The process of obtaining path in routing table is called path determination. There are three
different methods to which router can learn path.
i) Automatic detection of directly connected n/w.
ii) Static & Default routing
iii) Dynamic routing

(2) Packet forwarding
It is a process that is by default enable in router. The router will perform packet forwarding
only if route is available in the routing table.

Static Routing

In this routing, we have to use IP route commands through which we can specify routes for
different networks. The administrator will analyze whole internetwork topology and then specify
the route for each n/w that is not directly connected to the router.

Steps to perform static routing

(1) Create a list of all n/w present in internetwork.
(2) Remove the n/w address from list, which is directly connected to n/w.
(3) Specify each route for each routing n/w by using IP route command.

Router(config)#ip route <destination n/w> <mask> <next hop ip>

Next hop IP it is the IP address of neighbor router that is directly connected our router.

Static Routing Example: -

Router#conf ter
Router(config)#ip route 10.0.0.0 255.0.0.0 192.168.10.2

Advantages of static routing

(1) Fast and efficient.
(2) More control over selected path.
(3) Less overhead for router.

Disadvantages of static routing

(1) More overheads on administrator.
(2) Load balancing is not easily possible.
(3) In case of topology change routing table has to be change manually.

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Alternate command to specify static route

Static route can also specify in following syntax: -
Old
Router(config)#ip route 172.16.0.0 255.255.0.0 172.25.0.2
Or
Router(config)#ip route 172.16.0.0 255.255.0.0 serial 0

Default Routing
Default routing means a route for any n/w. these routes are specify with the help of following
syntax: -
Router(config)#ip route 0.0.0.0 0.0.0.0 <next hop>
Or
<exit interface>

To display routing table

Router#sh ip route

To check all the interface of a router

Router#sh interface brief

Dynamic Routing
In dynamic routing, we will enable a routing protocol on router. This protocol will send its
routing information to the neighbor router. The neighbors will analyze the information and write
new routes to the routing table.
The routers will pass routing information receive from one router to other router also. If
there are more than one path available then routes are compared and best path is selected. Some
examples of dynamic protocol are: -
RIP, IGRP, EIGRP, OSPF

Types of Dynamic Routing Protocols

According to the working there are two types of Dynamic Routing Protocols.
(1) Distance Vector
(2) Link State

According to the type of area in which protocol is used there are again two types of protocol: -

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(1) Interior Routing Protocol
(2) Exterior Routing Protocol

Autonomous system

Autonomous system is the group of contiguous routers and n/w, which will share their routing
information directly with each other. If all routers are in single domain and they share their
information directly with each other then the size of routing updates will depend on the no. of
n/w present in the Internetwork. Update for each n/w may take 150 – 200 bytes information.
For example: - if there are 1000 n/ws then size of update will be
200*1000 = 200000 bytes
The routing information is send periodically so it may consume a large amount of bandwidth in
our n/w.
Border
Exterior Routing Routing

Interior Routing
AS
AS 200 AS
Domain
400
500
Protocols

Distance Vector Routing

The Routing, which is based on two parameters, that is distance and direction is called Distance
Vector Routing. The example of Distance Vector Routing is RIP & IGRP.

Operation: -

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(1) Each Router will send its directly connected information to the neighbor router. This
information is send periodically to the neighbors.

(2) The neighbor will receive routing updates and process the route according to following
conditions: -
(i) If update of a new n/w is received then this information is stored in routing table.
(ii) If update of a route is received which is already present in routing table then route will
be refresh that is route times is reset to zero.
(iii) If update is received for a route with lower metric then the route, which is already present
in our routing table. The router will discard old route and write the new route in the routing table.
(iv) If update is received with higher metric then the route that is already present in routing
table, in this case the new update will be discard.

(3) A timer is associated with each route. The router will forward routing information on all
interfaces and entire routing table is send to the neighbor. There are three types of timers
associated with a route.

Configuring RIP
Router#conf ter
Router(config)#router rip
Router(config-router)#network <own net address>
Router(config-router)#network <own net address>
--------------
--------------

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Router(config-router)#exit

172.16.0.6

10.0.0.1 172.16.0.5 175.2.1.1
R
1 200.100.100.12

Router(config-router)#network 10.0.0.0

175.2.0.0 via 172.16.0.6

Configuring IGRP

Router(config)#router igrp <as no>(1 – 65535)
Router(config-router)#network <net address>
Router(config-router)#network <net address>

Serial E1 modem Serial E1

2048 k 2048 k
256 k

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sync

Configuring following options in IGRP as same as in case of RIP: -

(1) Neighbor
(2) Passive interface
(3) Timer
(4) Distance (AD)
(5) Maximum path

Link State Routing

This type of routing is based on link state. Its working is explain as under

(1) Each router will send Hello packets to all neighbors using all interfaces.
(2) The router from which Hello reply receive are stored in the neighborship table. Hello packets
are send periodically to maintain the neighbor table.

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(3) The router will send link state information to the all neighbors. Link state information from
one neighbor is also forwarded to other neighbor.
(4) Each router will maintain its link state database created from link state advertisement
received from different routers.
(5) The router will use best path algorithm to store the path in routing table.

Problems of Link State Routing

The main problems of link state routing are: -
(1) High bandwidth consumption.
(2) More hardware resources required that is processor and memory (RAM)

The routing protocols, which use link state routing are: -
(1) OSPF
(2) EIGRP

Enhanced Interior Gateway Routing Protocol

Features: -
* Cisco proprietary
* Hybrid protocol
Link State
Distance Vector
* Multicast Updates using
Address 224.0.0.10
* Support AS
* Support VLSM
* Automatic Route Summarization
* Unequal path cost load balancing
* Metric (32 bit composite)
Bandwidth
Delay
Load
Reliability
MTU
* Neighbor Recovery
* Partial updates
* Triggered updates
* Backup Route

Configuring EIGRP

Router(config)#router eigrp <as no>
Router(config-router)#network <net addr.>
Router(config-router)#network <net addr.>

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OSPF Terminology
Already known topics in this: -
(1) Hello packets
(2) LSA (Link State Advertisement)
(3) Neighbor
(4) Neighbor table
(5) Topology table (LSA database)

Router ID

Router ID is the highest IP address of router interfaces. This id is used as the identity of the
router. It maintaining link state databases. The first preference for selecting router ID is given to
the Logical interfaces. If logical interface is not present then highest IP of physical interface is
selected as router id.

Highest ip is router id of a router

50.0.0.6

11.0.0.2 13.0.0.1

Area

Area is the group of routers & n/ws, which can share their routing information directly with each
other.

Adjacency

A router is called adjacency when neighbor relationship is established. We can also say
adjacency relationship is formed between the routers.

OSPF Hierarchical Model Area 0

Page | 31

br br br

abr abr abr

asb ar ar ar
r

ar ar ar

Area 20 Area 70 Area 90

Area Router (Autonomous System Border Router – ASBR)

A router, which has all interfaces member of single area, is called area router.

Backbone Area

Page | 32

Area 0 is called backbone area. All other areas must connect to the backbone area for
communication.

Backbone Router

A router, which has all interfaces members of area 0, is called backbone router.

Area Border Router

A router, which connects an area with area 0, is called area border router.

LSA Flooding in OSPF

If there are multiple OSPF routers on multi access n/w then there will be excessive no. of LSA
generated by the router and they can choke bandwidth of the network.

L K M N

A B C D

A B C D

B A A A Neighbor
C C B B
D D D C
L K M N

This problem is solved with the help of electing a router as designated router and backup
designated router.

Designated Router

Page | 33

A router with highest RID (router id) will be designated router for a particular interface. This
router is responsible for receiving LSA from non-DR router and forward LSA to the all DR
router.

Backup Designated Router

This router will work as backup for the designated router. In BDR mode, it will receive all
information but do not forward this information to other non-DR router.

Commands to configure OSPF

Router#conf ter
Router(config)#router ospf <process no>
Router(config-router)#network <net address> <wild mask> area <area id>
Router(config-router)#network <net address> <wild mask> area <area id>

Wild Mask – Complement of subnet mask

Example 255.255.0.0
0.0.255.255

255.255.255.255
- Subnet mask

Wild mask

255.255.255.255
- 255.255.192.0 subnet mask

0.0.63.255 wild mask

Page | 34

Area 0

R 200.100.100.33/30 200.100.100.34/30
R
1 2

200.100.100.66/27 200.100.100.160/26

R1
Router(config)#router ospf 33
Router(config-router)#network 200.100.100.32 0.0.0.3 area 0

R2
Router(config)#router ospf 2

Page | 35

LAN Switching
Ethernet switches are used in LAN to create Ethernet n/ws. Switches forward the
traffic on the basis of MAC address. Switches maintain a Mac Addresse table in
which mac addresses and port no.s are used to perform switching decision.
Working of bridge and switch is similar to each other.

Classification of switches

Switches are classified according to the following criteria: -

Types of switches based on working

(1) Store & Forward
This switch receives entire frame then perform error checking and start
forwarding data to the destination.

(2) Cut through
This switch starts forwarding frame as soon as first six bytes of the frame are
received.

(3) Fragment-free
This switch receives 64 bytes of the frame, perform error checking and then
start forwarding data.

(4) Adaptive cut-through
It changes its mode according the condition. If it see there are errors in many
frames then it changes to Store & Forward mode from Cut through or Fragment-
free.

Types of switches based on management

(1) Manageable switches
(2) Non-Manageable switches
(3) Semi-Manageable switches

Types of switches based on OSI layer

Page | 36

(1) Layer 2 switches (only switching)
(2) Layer 3 switches (switching & routing)

Types of switches based on command mode (only in Cisco)

(1) IOS based
(2) CLI based

Type of switches based on hierarchical model

(1) Core layer switches
(2) Distribution layer switches
(3) Access layer switches

Qualities of switch

- No. of ports
- Speed of ports
- Type of media
- Switching or wire speed or throughput

Basic Switch Administration

IOS based switches are similar to the routers. We can perform following function
on switches in a similar manner as performed on router.
(1) Access switch using console
(2) Commands to enter & exit from different mode
(3) Commands to configure passwords
(4) Manage configuration
(5) Backup IOS and configuration
(6) Configuring and resolving hostnames
(7) Managing telnet
(8) Configuring CDP
(9) Configuring time clock
(10) Configuring Banners
(11) Command line shortcuts and editing shortcuts

Page | 37

(12) Managing history
(13) Configure logging
(14) Boot system commands

Following function and options are not similar in router and switch.
(1) Default hostname is ‘Switch’
(2) Auxiliary port is not present
(3) VTY ports are mostly 0 to 15
(4) By default interfaces are enabled
(5) IP address cannot be assign to interfaces
(6) Routing configuration mode is not present
(7) Interface no. starts from 1
(8) Web access is by default enabled
(9) Configuration registry is not present in similar manner
(10) Flash memory may contain multiple files and startup-configuration is also
saved in flash

Configuring IP and Gateway on switch

We can configure IP address on switch for web access or telnet IP address is
required for the administration of the switch. If we have to access switch from
remote n/w then we will configure default gateway in addition to IP address.
IP address is assigned to the logical interface of switch with following
command:-
Switch(config)#interface vlan 1
Switch(config)#IP address <ip> <mask>
Switch(config)#no sh
Switch(config)#exit

Old Switches

Switch(config)#ip address <ip> <mask>
Switch(config)#exit

Configuring Gateway

Switch(config)#ip default-gateway <ip>

Page | 38

Switch(config)#exit

Breaking Switch Password

(1) Power off switch press mode button present in front of switch then power on
the switch.
(2) Keep mode button press until ‘Switch:’ prompt appears on console.
(3) In switch monitor mode, type following commands: -
flash_init
load_helper
rename flash:config.text flash:<anyname>
dir flash:
boot
(4) After booting switch will prompt to enter in initial configuration dialog. Enter
‘no’ here and type.
Switch>enable
Rename flash:<anyname> Flash:config.text
Configure memory

Change password and save config. Then copy run start_config.

Cisco Hierarchal Model

When we want to create a large sized LAN network then we may face following
problems if we are going design the network in flat model.
(1) High latency
(2) Conjunction between switches
(3) Large broadcast domain

Cisco hierarchal model recommends three layer design of the network
(i) Core layer
(ii) Distribution layer
(iii) Access layer

on each layer there are some rules which we have to follow
(1) Highest performance devices are connected on Core layer
(2) Resources should be placed on Core layer

Page | 39

(3) Polices should not be applied on core layer
(4) On distribution layer, we can implement policies
(5) Distribution and Core devices should be connected with high-speed links.
(6) Access layer devices are basic devices and may be non manageable.

Server

CORE

1 GBps

Distributio Distributio Distributio
n n n
100 MBps

Accesss Accesss Accesss Accesss Point

(Hierarchal model)

After using hierarchal model the most of LAN problem will be solve but one
problem still remain same that is all pc s will be in single broadcast domain. We
have to implement following solution for this problem.
(1) Physical Segmentation
(2) Logical Segmentation
VLAN
Trunking
Page | 40

VTP
Inter VLAN
Pruning

Logical Segmentation of Network

To perform logical segmentation, we have to create VLAN in the network. With
the help of VLAN, we can logically divide the broadcast domain of the network.

VLAN (Virtual LAN)
VLAN provides Virtual Segmentation of Broadcast Domain in the network. The
devices, which are member of same Vlan, are able to communicate with each
other. The devices of different Vlan may communicate with each other with
routing. So that different Vlan devices will use different n/w addresses. Vlan
provides following advantages: -
(1) Logical Segmentation of network
(2) Enhance network security

Creating port based Vlan

In port based Vlan, first we have to create a Vlan on manageable switch then we
have to add ports to the Vlan.

Commands to create Vlan

Switch#config ter
Switch(config)#vlan <no>
[name <word>]
Switch(config)#exit optional

Or

Switch#vlan database
Switch(vlan)#vlan <no>
[name <word>]

Page | 41

Switch(vlan)#exit

Commands to configure ports for a Vlan

By default, all ports are member of single vlan that is Vlan1. we can change vlan
membership according to our requirement.

Switch#conf ter
Switch(config)#interface <type> <no>
Switch(config-if)#switchport access vlan <no>
Switch(config-if)#exit

Commands to configure multiple ports in a vlan

Switch#conf ter
Switch(config)#interface range <type> <slot/port no (space)–(space) port no>
Switch(config-if)#switchport access vlan <no>

Example: - Suppose we want to add interface fast Ethernet 0/10 to 0/18 in vlan5
Switch#config ter
Switch(config)#interface range fastethernet 0/10 – 18
Switch(config-if)#switchport access vlan 5
Switchconfig-if#exit

In 1900 & Compatible switches

Switch#config ter
Switch(config-if)#vlan-membership static <vlan no>

To Disable web access in switch

Switch#config ter
Switch(config)#no ip http server

Page | 42

To display mac address table

Switch#sh mac-address-table

Vlan Mac address type ports
20 00-08-a16-ab-6a-7b dynamic fa0/7

To Display Vlan and port membership

Switch#sh vlan

Trunking

When there are multiple switches then we have to use trunk links to connect one
switch with other. If we are not using trunk links then we have to connect one
cable from each vlan to the corresponding vlan of the other switch.

Normal: -

Vlan 1 7 3 1 3 7
6

In Trunking: - Vlan 1,3,7

1 7 3 1 3 7

Trunk Trunk
Page | 43

Switches will perform trunking with the help of frame tagging. The trunk port will
send data frames by adding a Vlan id information to the frame, at the receiving end
vlan id information is removing from the end and according to the tag data is
delivered to the corresponding vlan. There are two protocols to perform frame
tagging.
(1) Inter switch link (cisco prop)
(2) IEEE 802.1 q

Configuring Trunking

In cisco switches all switch ports may be configured in three modes
(1) Trunk desirable (default)
(2) Trunk on
(3) Trunk off

Switch#conf ter
Switch(config-if)#switchport mode <trunk|access|auto>
Switch(config-if)#exit on off desirable

To configure Vlans allowed on Trunk

By default all Vlans are allowed on Trunk port. We can add/remove a partucular
Vlan from trunk port with following command
Switch#config ter
Switch(config-if)#switchport trunk allowed vlan all
Remove <vlan>
Add <vlan>
Except <vlan>

To display trunk interfaces

Switch#sh interface trunk
Switch#sh interface <type> <no> trunk

Vlan Trunking Protocol (VTP)

Page | 44

With the help of VTP, we can simplify the process of creating Vlan. In multiple
switches, we can configure one switch as VTP server and all other switches will be
configured as VTP client. We will create Vlans on VTP server switch. The server
will send periodic updates to VTP client switches. The clients will create Vlans
from the update received from the VTP server.

VTP server

VTP server is a switch in which we can create, delete or modify Vlans. The server
will send periodic updates for VTP clients.

VTP client

On VTP client, we are not able to create, modify or delete Vlans. The client will
receive and forward vtp updates. The client will create same Vlans as defined in
vtp update.

VTP Transparent

Transparent is a switch, which will receive and forward VTP update. It is able to
create, delete and modify Vlans locally. A transparent will not send its own VTP
updates and will not learn any information from received vtp update.

VTP Domain VTP server
VTP password Vlan 1,3,5,10,20

Vlan Client Client Clinet Vlan 1,3,10,20,40,90
1,3,5,10,20

Client Client Client Client

VTP Transparent

Page | 45

Commands

Switch#conf ter
Switch(config)#vtp domain <name>
Switch(config)#vtp password <word>
Switch(config)#vtp mode <server|client|transparent>
Switch(config)#exit

By default in cisco switches the VTP mode is set as VTP server with no domain
and no password.

To display VTP status

Switch#sh vtp status

VTP Pruning

Pruning is the VTP feature through which a trunk link can be automatically
disable, for a particular Vlan if neighbor switch does not contain ports in that Vlan.
Vlan1 is not prun eligible.

Command to configure VTP Pruning

We have to use only one command on VTP server for VTP Pruning.
Switch#conf ter
Switch(config)#vtp pruning
Switch(config)#exit

Server
Vlan 1,3,5,7

Page | 46

Client Client Client

Vlan 1 3 5 71 3 5 7 1 3 5 7

Inter Vlan Communication

After creating Vlans, each Vlan has own broadcast domain. If we want
communication from one Vlan to another Vlan then we need to perform routing.
There are three methods for inter vlan communication.
(1) Inter Vlan using multi-interface router
(2) Inter Vlan using router on a stick method
(3) Inter Vlan using layer 3 switch
1751, 2621 routers supports Vlan
(1) Inter Vlan using multi-interface router
In this case, we have to connect one interface of router in each Vlan. This
interface will act as gateway for the corresponding vlan. Each Vlan has to use
different n/w addresses. Data from one Vlan to another Vlan will travel by router.

Router
10.0.0.1 E0 E2 12.0.0.1
E1
11.0.0.1

Vlan1 Vlan3
Vlan5
T T
1, 3, T
5

1 3 1 3 5 1 3
5 5
N/w 10.x.x.x 11.x.x.x 12.x.x.x
Gateway 10.0.0.1 11.0.0.1 12.0.0.1
(2) Inter Vlan using router on a stick method
In this method a special router is used for Inter Vlan. In this router, we can
create one interface for each Vlan. The physical interface of router will be

Page | 47

connected on trunk port switch. This router will route traffic on the same interface
by swapping vlan id information with the help of frame tagging protocol.

Router
Fa 0/0.1 – 10.0.0.1 -> Vlan1
Fa 0/0.2 – 11.0.0.1 -> Vlan3
Fa 0/0 Fa 0/0.3 – 12.0.0.1 -> Vlan5

Vlan 1, 3, 5
Trunk
T T
T

T T T
1 3 5 1 3 5 1 3 5

N/w 10.x.x.x 11.x.x.x 12.x.x.x
Gateway 10.0.0.1 11.0.0.1 12.0.0.1

Configuration on Router

Router#config ter
Router(config)#interface fastethernet 0/0
Router(config-if)#no ip address
Router(config-if)#no sh

Router(config)#interface fastethernet 0/0.1
Router(config-if)#encapsulation dot1q 1
Router(config-if)#ip address 10.0.0.1 255.0.0.0

Page | 48




Configuration on Core switch

(1) Configure switch as VTP server
(2) Create Vlans
(3) Configure interface connected to router as Trunk
(4) Configure interfaces connected to other switches as trunk (if required)

Configuration on Distribution layer switches

(1) Configure switch as VTP client
(2) Configure required interface as Trunk (optional)
(3) Add ports to Vlan

Configuration on Pc

Configure IP and Gateway

Spanning Tree Protocol

When we connect multiple switches with each other and multiple path exist from
one switch to another switch then it may lead to the switching loop in the network.

Page | 49

Multiple paths are used to create redundancy in the network. STP is only required
when multiple path exist then there is possibility of loop in n/w.

Packets

Switch Switch Switch

Problems the occur with redundancy path

(1) Multiple copies of the frame will be received by destination.
(2) Frequent changes in the mac address table of switch.
(3) A mac address may appear at multiple ports in a switch.
(4) Packets may enter in the endless loop.

Spanning Tree Protocol will solve this problem by blocking the redundancy
interface. So that only one path will remain active in the switches. If the primary
path goes down then disabled link will become enable and data will be transferred
through that path.

Working of STP

The STP will create a topology database in which one switch will be elected as
Route switch. Path cost is calculated on the basis of bandwidth. The lowest path
cost link will be enable mode and another path will be disable.

Root
Switch

1 Gb 1 Gb
Switch Switch

Page | 50

100 Mb 100 Mb

100 Mb
Switch Switch

Lowest cost
(Disable)

STP terminology

(1) Bridge id
It is the combination of bridge priority and base mac address. In Cisco switches
default priority no. is 32768.

(2) Root Bridge
The Bridge/Switch with lowest Bridge id will become the Route Bridge. Route
Bridge is used as the center point for calculating path cost in topology.

(3) BPDU Bridging Protocol Data Units
It is the STP information, which is exchange between the switches to create
topology and path selection.

(4) STP port mode
An STP is enabled a port may be in one of the following mode.
(i) Listening: - in this mode a port will send/receive BPD.
(ii) Learning: - a port will learn mac address table.
(iii) Forwarding: - the port will forward data based on mac address table.
(iv) Blocking: - the port is block to send/receive data by Spanning Tree
Protocol.
(v) Disable: - the port is administratively disabled.

Path cost calculation

The links in switches will be enable or disabled on the basis of path cost. The path
cost for each link is calculated according to following table.

Old IEEE New IEEE

Speed Cost Cost

Page | 51

10 Mb 100 100
100 Mb 10 19
1 Gb 1 4
10 Gb 1 2

To configure ports for forwarding mode directly

Switch#config ter
Switch(config-if)#switchport host

Configuring port security

In manageable switches, we can restrict the no. of mac addresses that a port can
learn. Even we can specify the mac address statically with a command. With port
security, we can also specify the action to be perform if port security violation is
detected.

Switch#conf ter
Switch(config-if)#switchport port-security
Switch(config-if)#switchport port-security maximum <no. of mac>
Switch(config-if)#switchport port-security violation <shutdown|restrict|reject>
Switch(config-if)#switchport port-security mac-address sticky
Switch(config-if)#switchport port-security mac-address sticky <mac address>

Access Control List
ACL are the basic security feature that is required in any network to control the flow of traffic.
Most of time our network may have servers and clients for which traffic control is required.
We can also use ACL to classify the traffic. ACLs are used in features like QOS (Quality
of Service), Prioritize traffic and interesting traffic for ISDN.

Page | 52

Classification Access Control List: -

Types of ACL based on Protocol: -
(1) IP Access Control List
(2) IPX Access Control List
(3) Appletalk Access Control List

Types of ACL based on Feature: -
(1) Standard ACL
(2) Extended ACL

Types of ACL based on Access mode: -
(1) Numbered ACL
(2) Named ACL

Types of ACL based on Order of rules: -
(1) Deny, permit
(2) Permit, deny

IP Standard ACL (Numbered)
In Standard ACL, we are only able to specify source address for the filtering of packets. The
syntax to create IP standard ACL are: -

Router#conf ter
Router(config)#access-list <no> <permit|deny> <source>
Router(config)#exit

<source> Single pc host 192.168.10.5
192.168.10.5
192.168.10.5 0.0.0.0

N/w 200.100.100.0 0.0.0.255

Subnet 200.100.100.32 0.0.0.15

Applying ACL on interface

Router#conf ter
Router(config-if)#ip access-group <ACL no.> <in|out>

Page | 53

Internet

Router

Router(config)#access-list 25 permit 192.168.10.32 0.0.0.31
Router(config)#access-list 25 permit 192.168.10.64 0.0.0.3
Router(config)#access-list 25 permit 192.168.10.68

Router(config)#interface serial 0
Router(config-if)#ip access-group 25 out

IP Standard ACL (Named)
In Numbered ACL editing feature is not available that is we are not able to delete single rule
from the ACL. In Named ACL editing feature is available.

Router#config ter
Router(config)#ip access-list standard <name>
Router(config-std-nacl)#<deny|permit> <source>
Router(config-std-nacl)#exit

Router#conf ter
Router(config)#ip access-list standard abc
Router(config-std-nacl)#deny 172.16.0.16
Router(config-std-nacl)#permit any

Page | 54

To modify the ACL

Router#conf ter
Router(config)#ip access-list standard abc
Router(config-std-nacl)#no deny 172.16.0.17

IP Extended ACL (Numbered)
Extended ACL are advanced ACL. ACL, which can control traffic flow on the basis of five
different parameters that are: -
(i) Source address
(ii) Destination address
(iii) Source port
(iv) Destination port
(v) Protocol (layer 3/layer 4)

The syntax to create Extended ACL

Router#conf ter
Router(config)#access-list <no> <deny|permit> <protocol> <source> [<s.port>]
<destination> [<d.port>]
router(config)#exit

To display ACL

Router#show access-lists or
Router#show access-list <no>

To display ACL applied on interface

Router#show ip interface

Router#show ip interface <type> <no>
Router#show ip interface Ethernet 0
Time-Based ACLs
In this you can specify a certain time of day and week and then identity that particular period by
giving it a name referenced by a task. The reference function will fall under whatever time
constraints you have dictated. The time period is based upon the router’s clock, but it is highly
recommended that using it in conjunction with Network Time Protocol (NTP) synchronization.

Router#conf ter
Router(config)#time-range no-http

Page | 55

Router(config-time-range)#periodic <Wednesday|weekdays|weekend> 06:00 to 12:00
Router(config-time-range)#exit

Router(config)#time-range tcp-yes
Router(config-time-range)#periodic weekend 06:00 to 12:00
Router(config-time-range)#exit

Router(config)ip access-list extended time
Router(config-ext-nacl)#deny tcp any any eq www time-range no-http
Router(config-ext-nacl)#permit tcp any any time-range tcp-yes

Router(config-ext-nacl)#interface f0/0
Router(config-if)#ip access-group time in
Router(config-if)#do show time-range

Network Address Translation

NAT is the feature that can be enable in a Router, Firewall or a Pc. With the help of NAT, we are
able to translate network layer addresses that are IP addresses of packets. With the help of Port
Address Translation, we are also able to translate port no.s present in transport layer header.

Page | 56

There are two reasons due to which we use NAT: -

(1) Conserve Live IP address
On Internet, there are limited no of IP addresses. If our Pc wants to communicate on Internet
then it should have a Live IP address assigned by our ISP. So that IP address request will depend
on no. of PCs that we want to connect on Internet. Due to this, there will be a lot of wastage in IP
addresses. To reduce wastage, we can share live IP addresses between multiple PCs with the help
of NAT.

(2) NAT enhances the network security by hiding PC & devices behind NAT.

Working of NAT & PAT

10.0.0.5

Internet
10.0.0.6 10.0.0.1 200.100.100.12
Switc NAT
h

10.0.0.7

10.0.0.8

10.0.0.5
200.100.100.1
2
1080

10.0.0.6
200.100.100.1
2
1085
10.0.0.7
200.100.100.1 Port Translation
2 Page | 57
1024

1100

10.0.0.8
200.100.100.1
2
1024

Types of NAT

Static NAT

This NAT is used for servers in which one Live IP is directly mapped to one Local IP. This NAT
will forward on the traffic for the Live IP to the Local PC in the n/w.

Static NAT
200.1.1.5 = 192.168.10.6
Interne
Route t
r
Live 200.1.1.5

Local 192.168.10.6

Dynamic NAT

Dynamic NAT is used for clients, which want to access Internet. The request from multiple
client IPs are translated with the Live IP obtained from the Pool. It is also called Pool Based
Dynamic NAT.

Page | 58

Pool => 200.1.1.8 – 200.1.1.12/28
Local address => 172.16.X.X
Except => 172.16.0.5 Interne
172.16.0.6 ttt
172.16.0.7

Route
r

Web Server DNS Full access 172.16.X.X
172.16.0.5 172.16.0.6 172.16.0.7

Configuring NAT

Router#conf ter
Router(config)#int serial 0
Router(config-if)#ip nat outside
Router(config-if)#int eth 0
Router(config-if)#ip nat inside

Router(config)#ip nat inside source static 172.16.0.7 200.1.1.3
Router(config)#ip nat inside source static tcp 172.16.0.5 80 200.1.1.4 80
Router(config)#ip nat inside source static udp 172.16.0.6 53 200.1.1.4 53

Router(config)#access-list 30 deny 172.16.0.5
Router(config)#access-list 30 permit any
Router(config)#ip nat pool abc 200.1.1.8 200.1.1.12 netmask 255.255.255.240
Router(config)#ip nat inside source list 30 pool abc overload

NAT + PAT

Page | 59

Command for Basic NAT

Router(config)#ip nat inside source list 30 interface serial 0
<exiting interface name>

To display NAT translation

Router#sh ip nat translations
(after ping any address, it shows ping details)

To clear IP NAT Translation

Router#clear ip nat Translation *

SECURING PRIVATE ENVIORNMENT
BY USING NAT

PROJECT REPORT

Page | 60

The project is based on network addressing translation(nat).
The beauty of configuring nat on routers is that it can help
users access internet on private ip address which are
otherwise excluded by internet service provider(isp).
We have used inter VLAN technology to make work efficient
between 3 different and independent organisations. The
vlans have been divided into web servers and internet
clients.

DESCRIPTION
We have three organisations. Org1, org2 and org3.
Each organisation comprises a router, to route the data from
and to isp. There are manageable switches in each

Page | 61

organisation and we have created separate vlans for servers
and internet clients.
If we want the communication between the internet clients
and servers then we configure inter vlan concept on the
router. And if we want to block some internet clients cannot
access our servers then we create acl for that particular user.
These organisations are linked externally to an isp which
provides live(public) ip addresses to each organisation, and
isp also provides the internet connections to others.

CONFIGURATION
FOR ORG1

Page | 62

%SYS-5-CONFIG_I: Configured frROUTER ORG1
Router>en
Router#config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#hostname ORG1
ORG1(config)#line console 0
ORG1(config-line)#password net
ORG1(config-line)#login
ORG1(config-line)#exit
ORG1(config)#line vty 0 4
ORG1(config)#enable password net
ORG1(config)#enable secret net1
ORG1(config)#int f0/0
ORG1(config-if)#no sh

%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

Page | 63

ORG1(config-if)#exit
ORG1(config)#int f0/0.1

%LINK-5-CHANGED: Interface FastEthernet0/0.1, changed state to
upRouter(config-subif)#encapsulation dot1q 2
ORG1(config-subif)#ip nat inside
ORG1(config-subif)#ip address 10.0.0.1 255.0.0.0
ORG1(config-subif)#no sh
ORG1(config-subif)#exit

ORG1(config-subif)#encapsulation dot1q 3
ORG1(config)#int s0/0/0
ORG1(config-if)#ip nat outside
ORG1(config-if)#clock rate 64000
ORG1(config-if)#ip address 200.10.10.5 255.255.255.252

%LINK-5-CHANGED: Interface Serial0/0/0, changed state to down
ORG1(config)#ip route 0.0.0.0 0.0.0.0 serial 0/0/0

We have place our web server in the private area so that the internet client cannot
directly access it. So, we have configured static nat and open port number 80(http)
only.

ORG1(config)#ip nat inside source static tcp 10.0.0.2 80 200.10.10.17 80

In our organisation our clients want to access internet so we will configure
dynamic nat with overload for clients.

Page | 64

ORG1(config)#access-list 20 permit any
ORG1(config)#ip nat pool netmax 200.10.10.18 200.10.10.18 netmask
255.255.255.240
ORG1(config)#ip nat inside source list 20 pool netmax overload
ORG1(config)#exit

ORG1#wr
Building configuration...
[OK]
ORG1#

SWITCH

Switch>en
% Warning: It is recommended to configure VLAN from config mode,
as VLAN database mode is being deprecated. Please consult user
documentation for configuring VTP/VLAN in config mode.
Switch(vlan)#vlan 2 name server
VLAN 2 added:
Name: server
Switch(vlan)#vlan 3 name clients
Page | 65

VLAN 3 added:
Name: clients
Switch(vlan)#exit
APPLY completed.
Exiting....
Switch#config t
Switch(config)#int f0/1
Switch(config)#int range f0/2 - 3
Switch(config-if-range)#switchport access vlan 3
Switch(config-if-range)#exit
Switch(config-if)#switchport mode trunk
Switch(config)#exit
Switch#wr

FOR ORG2
ROUTER
Router>en
Router#config t
Page | 66



ORG2(config)#ip nat inside source static 10.0.0.2 200.10.10.33
255.255.255.240
ORG2(config)#ip nat inside source list 20 pool netmax
ORG2(config)#exit
%SYS-5-CONFIG_I: Configured from console by console
ORG2#wr
[OK]
ORG2#

Page | 67

SWITCH
Switch>en
VLAN 2 added:
Name: server
VLAN 3 added:
Name: clients
Switch(vlan)#exit
APPLY completed.
Exiting....
Switch#config t
Switch(config)#exit
Switch#wr

FOR ORG3
ROUTER
Router>en
Router#config t
Page | 68



ORG3(config)#ip nat inside source static 10.0.0.2 200.10.10.50
Page | 69

255.255.255.240
ORG3(config)#ip nat inside source list 20 pool netmax overload
ORG3(config)#exit
%SYS-5-CONFIG_I: Configured from console by console
ORG3#wr
[OK]
ORG3#

SWITCH

Switch>en
VLAN 2 added:
Name: server
VLAN 3 added:
Name: clients
Switch(vlan)#exit
APPLY completed.
Exiting....
Switch#config t

Page | 70

Switch(config)#exit
Switch#wr

REFERENCES

Wikipedia
Google
www.edu.ac.in
NETMAX TECHNOLOGIES
CISCO

Page | 71

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