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Linux in a Nutshell

This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.

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route

route [options] [command]

TCP/IP command. Add or remove entries in the routing tables maintained by routed. route accepts two commands: add, to add a route, and del, to delete a route. The two commands have the following syntax:

add [-net | -host] address [modifiers] del [-net | -host] address [modifiers]

address is treated as a plain route, unless -net is specified or address is found in /etc/networks. -host can be used to specify that address is a plain route whether or not it is found in /etc/networks. Using route modifiers, you can specify the gateway through which to route packets headed for that address, its netmask, TCP mss, or the device with which to associate the route; you can also mask certain routes. Only a privileged user may modify the routing tables.

If no command is specified, route prints the routing tables.

Options

-A family, --family

Specify an address family to use with an add or del command. family may be inet, inet6, ax25, netrom, ipx, ddp, or x25.

-C, --cache

Perform command on the routing cache instead of the forwarding information base (FIB) routing table.

-e, --extend

Use netstat -r format to print routing table. Use twice to print extended information. Same as netstat -ree.

-F, --fib

Perform command on the forwarding information base (FIB) routing table. This is the default behavior.

-h, --help

Print help message, then exit.

-n, --numeric

Show numerical addresses; do not look up hostnames. (Useful if DNS is not functioning properly.)

-v, --verbose

Verbose mode.

-V, --version

Print version and configuration options, then exit.

Route modifiers

[dev] interface

Associate route with specified device. When the interface is given as the last argument on a command line, the word dev is optional.

netmask mask

Use netmask mask.

gw gateway

Route packets through gateway.

metric n

Set routing metric to n.

mss bytes

Set maximum segment size for connections over this route.

reject

Cause route lookup for target to fail. Used to mask out networks from a default route.

Example

Add a default gateway for interface eth0:

route add default gw 192.168.0.1 dev eth0


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