7

I have ubuntu 12.04 and I have configured /etc/network/interfaces like this 

auto eth2
iface eth2 inet dhcp

I also have 

auto eth1
iface eth1 inet static
        address 60.60.60.1 
        netmask 255.255.255.0
        network 60.60.60.0
        broadcast 60.60.60.255

and eth0 is similarly configured.

When I do sudo route I don't see default gw. I just see 60.60.60.0 * 255.255.255.0 eth1 and similarly 

10.0.0.0  *   255.255.255.0   U     0      0        0 eth2

Since the default gw is not present, I have got a proper 10.x.x.x IP address but no way to connect outside . How do I get the default gw automatically setup. I can add it using route add default gw and that works. But when I move locations, then I will have to keep on setting route add at every place manually

roadmr
  • 34,802
doon
  • 221

2 Answers2

5

I found the answer from this link https://serverfault.com/questions/527383/change-default-route-to-dhcp-interface-without-a-route-push I essentially set "post-up route del default dev eth2" and for any other interface on which I did not want the default gw (these were all addresses with static configuration). after doing /etc/init.d/networking restart , ubuntu will automatically pick up the default gw to the dhcp server and that worked. It took me 3+ hours of searching to find this :-)

Community
  • 1
doon
  • 221
2

Basically dhclient appears to only set the default gateway when routers are provided by the server and when a current default gateway is not set. so, as doon mentioned, you can add a "route del default gw" to your network configuration or you can do this manually (or in your own script) before dhclient is called.

gesell
  • 131