Problem : no traffic on on a second network interface card

[wp10596728-4]

Hi all,
B 
I have a machine with 4.8 OpenBSD, which I want to use as a gateway.
But I can not get any traffic on the 2nd nic.
Forwarding for inet and inet6 is set =1
It is not a problem of the nics. If I install nic2 first then it works and
nic1
doesn't work.
It is also not a problem of PF, which disabled for testing.
B 
Can anybody tell me what else do I need to mlook at?
B 
B 
Klaus