2

I just set up a second IP adress on my Ubuntu server and now I'm trying to change the default outgoing IP adress to the new one with ip route replace default via <old-ip> src <new-ip>.

But whenever I restart the networking service, it gets changed to the old IP adress.

3

Yes, that is because Ubuntu sets the default route dynamically on every startup of the networking service. You can open /etc/network/interfaces and append your command under the interface like this:

post-up ip route replace default via <old-ip> src <new-ip>
0

Do you mean you are trying to change your ip address?

https://help.ubuntu.com/lts/serverguide/network-configuration.html

change the settings in /etc/network/interfaces to set the ip address you would like. Just change eth0 to eth1 or whatever interface is.

auto eth0
iface eth0 inet static
address 10.0.0.100
netmask 255.255.255.0
gateway 10.0.0.1
  • I want to keep both for inbound connections but only the new one for outbound connections. – kevdotcom Sep 22 '16 at 15:23
  • Make sure the correct default gateway is set in the interfaces file, and remove all other gateway directives. – Tero Kilkanen Sep 22 '16 at 22:22

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