I'm trying to get a second NIC going in my Ubuntu server. I had installed the card and set the IP, etc. unfortunately I must have done it incorrectly. Even though both cards were enabled I was only able to use either or but not both at the same time.

Hopefully someone can help with the following questions:

1) What is the correct way to install multiple NIC's for different subnets in a single Linux machine? I realize this is all encompasing but I'm not sure how to break it up into smaller pieces.

2) If you create a virtual IP on a Linux Machine as opposed to a second NIC I'm assuming it can only listen on the subnet in which the actual non-virtual IP is established?

3) How do you deal with DNS, gateway and host entry's and the like? Does someone have an example of what those items would look like?

TIA for any information you can provide.

TW,

I will give kind of a simple answer.

Yes you can have 2 nics and 2 subnets no problem. Remember you can only have 1 gateway and you need to add some routes to get it to do what you want. If you want both networks to talk to eachother, then you can enable ip forwarding and then it should work.

At home I have a little network. I have a 192.168.1.0 and a 10.10.1.0 network. I am able to go from either side to the other side just by adding routes and ip forwarding. I also block some stuff from going from network to network also for security purposes. it's pretty easy once you get the hang of it

Thanks for the reply.

So, what's the norm with a setup such as this? Do people just ssh or use VNC into the Server?

So you would just not enter Gateway info for one card correct... basically the local LAN card would be my guess. I assume that is because they are on 2 different subnets?

I'm not familiar with setting up routes, do you have an example or some reference I could use.

Thanks,