Linux Networking Commands

Linux Networking Commands Copyright, 2002 © NTM Consulting Inc. TCP/IP Lecture Series Professor Tom Mavroidis

Commands Reviewed Ifconfig dmesg netstat ping route traceroute nslookup arp dig

ifconfig eth0 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

When would you use ifconfig? ,[object Object],[object Object],[object Object]

What should you do if the interface isn’t found? ,[object Object],[object Object],[object Object]

See if the device has been found - use dmesg ,[object Object],[object Object],TIP pipe the dmesg to the less command or the reply will scroll off the screen dmesg | less

Before you have a useable interface ,[object Object],[object Object],[object Object]

Does the localhost respond? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Confirm you have set up the interface correctly. ,[object Object],eth0 Link encap:Ethernet HWaddr 00:04:AC:16:54:4C inet addr: 192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::204:acff:fe16:544c/10 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:116242 errors:0 dropped:0 overruns:0 frame:0 TX packets:123380 errors:0 dropped:0 overruns:0 carrier:0 collisions:9052 RX bytes:39103579 (37.2 Mb) TX bytes:106270739 (101.3 Mb)

route ,[object Object],[object Object],[object Object],[object Object]

route -n ,[object Object],[object Object],[root@localhost root]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth1

route -Cn (display cache table) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

traceroute ,[object Object],Note Traceroute has lost some of its effectiveness since most ISP’s disallow it from running on their networks

arp ,[object Object],[object Object]

arp table ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

/etc/hosts ,[object Object],[root@localhost root]# less /etc/hosts # Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost 192.168.1.1 gatewayout.tcp-ip.ca 192.168.2.75 basement.tcp-ip.ca 192.168.1.101 just_a_node.tcp-ip.ca

arp -a will then resolve ,[object Object],[object Object],[object Object],[object Object],[object Object]

netstat -nr ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

dig - supercharged nslookup ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

dig - better than nslookup ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

References ,[object Object],[object Object]

Linux Networking Commands

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