how can I find the default gateway of an ubuntu box

Question

how can I find the default gateway of an ubuntu box

Answer 1

Classic answer

route

Look for a line that says something like:

default         10.63.3.254     0.0.0.0         UG    0      0        0 eth0

The second column contains the default gateway, and the last column is the interface.

You can also use the ip command:

ip route

which will give you something like

default via 10.63.3.254 dev eth0

Answer 2

You can also use "netstat -nr" (I usually leave the n in the flags, so as to not have to wait for host resolution if there's a DNS issue).

Answer 3

grog:/var/log# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0

You can also check /etc/network/interfaces to see what it'll be on next reboot or networking restart.