Swapping Oracle 7 installation between two network cards

We have an NT server with two network cards for resiliance. We recently tried to swap over to the second card and run Oracle. Oracle started-up ok, but we could not connect to the database from the Aix/PC clients. The tnsnames.ora points to the hostname of the server not a hardcoded address. The hostfile on both clients and server were updated and the server could be pinged. Is there something built into the initialization config, which points to a specific network card? Any help gratefully recieved.

Is the network up? (sudo ifconfig -a). Can you see eth0?
From a terminal session on the server, can you ping localhost, your ip address, gateway?
OL 5.7 boots the Oracle UEK kernel by default. You can also select the original Red Hat Kernel at startup. Does it make any difference?

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