Can you have 2 NICs connected to internet at the same time?

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Hi all,

We're changing ISPs and would like to have some servers operate on both networks at the same time. The servers have 2 NIC cards and I was planning to put the second card on the new network.

This seems to work at first when experimenting inside our network, however it turns out that the machines are not accessible from the Internet on their secondary network cards despite the fact that we can access them fine here from another computer plugged into the same switch.

Is it not possible to have a machine operate on two different Internet IP ranges at the same time? I know you can only have one default gateway and perhaps this is the problem.

Is there any other way we can somehow get the machine to appear to be on both networks concurrently while we migrate domain names and services to the new IP address? If not, we're going to have to physically duplicate all the services using spare computers which will be extremely time consuming.

Are there any other ways around this problem?

Thanks,

Nick...
.

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