Linux in a Nutshell, 6th Edition

Troubleshooting TCP/IP

The following commands can be used to troubleshoot TCP/IP. For more details on these commands, see Chapter 3:

dig

Query the DNS name service.

ifconfig

Provide information about the basic configuration of the network interface.

ifup and ifdown

On many systems used to start or stop a network interface.

iwconfig, iwlist, and wlancfg

Tools commonly used to configure a wireless network interface.

nc

Read and write data across a network connection.

netstat

Display network status.

ping

Indicate whether a remote host can be reached.

route

Allows you to read and set default gateway information, as well as static routes.

tcpdump

Dump network packet information to the screen or to file.

traceroute

Trace route taken by packets to reach network host.