I am currently switching our system from one data provider to another. We are limited on our number of IP address with the new provider, and so our AIX machines are going to be assigned private IP address.

The problem I'm having is setting the different ranges.

IP Address: 192.168.106.*
DNS Server: 65.14.22.35
Gateway: 65.14.22.34

The problem I'm running into is the Gateway. When I hit enter in smit to apply changes, the IP gets set and the DNS gets set. It complains about the destination being unreachable to set the gateway, however.

Is there anyway to manually edit a conf file somewhere to change the Gateway? Or at least some way to make smit let me set the gateway to an IP in a different range than the IP of en0?

Don't really know much about AIX.

However I see you're putting your gateway in a different subnet than your IP. I won't say this isn't possible but I've never done it . It seems to me you'd already have to have a route to the other subnet and it is the gateway that sets your default route so you'd be in a catch 22 situation.

Every gateway I've ever used is in the same subnet as the host's IP.

To then get access to the other subnet (assuming your gateway doesn't have its own route for that) with the route add command.