tcpip adapter configuration question on an Aix 4.3.3 server

I have a server with 2 ethernet adapters on it.
One is a Gigabit adapter with an assigned ip_adresss and up communicating.
Today I wanted to enable a 2nd interface (10/100) as we wanted to use it to isolate some traffic on just that adapter.
As soon as I provided it with an ip_address and brought it up my server stopped communicating on the primary adapter even though I didn't even have a UTP cable plugged into the second adapter.
I ended up doing an 'rmdev -dl en1' to get rid of the 2nd adapter I'd enabled and it finally brought things back to the way it was.

So my question is what did I do wrong? When I review what I'd entered I see I'd used the wrong netmask so could that have been the cuplrit?
I thought I'd be safe by not having anything plugged in but I guess not.

I'll have to try this again and I'm not sure now how to properly setup a 2nd interface on the same subnet with a different ip_address.

MS

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