This document discusses troubleshooting tips for data communications and networking. It covers using utilities like Ping, ARP, Netstat, Nbtstat, Ipconfig, and Tracert to troubleshoot TCP/IP issues. It also discusses using a protocol analyzer like Wireshark to analyze packets and network traffic. The document provides an introduction to troubleshooting hardware and cabling issues, then covers various TCP/IP utilities and their uses in troubleshooting before concluding with a brief overview of packet analysis.

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Troubleshooting
Tips: Data
Communications,
Networking and
TCP/IP
by
Steve Mackay

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Thank You For Your Interest
If you are interested in further training or information,
please visit:
http://www.idc-online.com/slideshare

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Overall Presentation
A quick introduction
to troubleshooting
industrial data
communications
systems from cabling
& hardware; TCP/IP
utilities to protocol
analysis.

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Objectives
• Basics of
troubleshooting
• Focus on TCP/IP Utilities
• Introduction to Protocol
analysis

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Topics
• Overall concept
• Hardware & Cabling
• TCP/IP Utilities
• Packet Analysis

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1.0 Introduction

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Overall Concept

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Tools of the trade
• Cable tester
• TCP/IP (and other third party) Utilities
• Protocol Analyzer (e.g. Wireshark)

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2.0 Hardware & Cabling

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Hardware and Physical Cabling
• Check cable on both sides of connection
• Switch lights
• Incorrect wire type and components
• Straight versus cross over cable
• Excessive untwists
• Damaged RJ-45 connector
• Electrical noise and shielding

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3.0 TCP/IP Utilities

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Utilities
• Ping
• Arp
• Netstat
• Nbtstat
• Ipconfig
• Tracert

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Ping -t
• Easiest ways to test connectivity across the network and
confirm that an IP address is reachable

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Arp -a
• Displays hardware and IP address mapping
• http://e-spohn.com/blog/2012/05/26/wep-cracking-automated/arp-request-replay/

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Netstat-e
• Displays activities since
last reboot
• Useful data on any
problems

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Nbtstat
• Protocol Stats & TCP/IP connections
• http://www.windowsecurity.com/articles-
tutorials/windows_os_security/Profiling-Operating-System-Part4.html

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Ipconfig /all

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Tracert

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4.0 Packet Analysis

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OSI Model

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Packet Structure

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Thank You For Your Interest
If you are interested in further training or information,
please visit:
http://www.idc-online.com/slideshare