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My Ubuntu 12.10 box has two network cards, Ethernet card (Eth0) is connected to internal network (192.168.18.0/24) without any internet access, Wireless card (Wlan0) is connected to intranet (10.124.64.0, 255.255.252.0) which has internet access. When I try to access internet, I have to disable Ethernet card (Eth0). Is there any way to config ip route from Ubuntu, something like 0.0.0.0 0.0.0.0 Wlan0, so I can access internet without disable Ethernet 0 card. Thanks for your help.

Kevin

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1 Answer 1

Reset to default
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First use the route command to find out what your current routing table looks like. It will probably look somewhat like this:

$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.18.1    0.0.0.0         UG    0      0        0 eth0
192.168.18.0    *               255.255.255.0   U     1      0        0 eth0
10.124.64.0     *               255.255.255.0   U     1      0        0 wlan0
...

Now you will want to replace the default gateway by a gateway on the 10.124.64/24 net. You can find out its IP by running route when eth0 is disabled or unplugged. Assuming it is the .1, you would then execute:

route del default
route add default gw 10.124.64.1

If you want to automate this, you could add these commands to an up statement in the appropriate stanza in /etc/network/interfaces (see man interfaces).

DISCLAIMER: route is considered old fashioned and I ought to be doing this using the ip route command; the effect however is identical. Also, adding an up statement to /etc/network/interfaces may be perceived by some as pre-historic. I'll be happy to upgrade my knowledge.

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