Route
From Linuxintro
Revision as of 01:42, 14 April 2009 by imported>ThorstenStaerk
The command route lets you view and modify your computer's network routing table. You can use it when troubleshooting network problems or when you have more than one network card.
If you just call route, you get a list of routing rules, like this:
# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 * 255.255.255.0 U 0 0 0 eth1 link-local * 255.255.0.0 U 0 0 0 eth1 loopback * 255.0.0.0 U 0 0 0 lo default 192.168.0.1 0.0.0.0 UG 0 0 0 eth1
The first blue line means: If there is any IP package for an IP address 192.168.0.*, just send it over network device eth1. The second blue line means: Every IP package that has not been handled yet, send over network device eth1 to the default gateway 192.168.0.1.
Removing a rule
# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth1 # route delete -net 192.168.0.0 netmask 255.255.255.0 eth0 # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth1
