I've got a CATS board with two de-type ethernet cards configured as
following:

de0: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu
1500
        address: 00:80:c8:46:2b:af
        media: autoselect (10baseT/UTP) status: active
        inet 136.170.145.82 netmask 0xfffff800 broadcast 136.170.151.255
        atalk 6.141 range 1-100 phase 2 broadcast 6.141
de1: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu
1500
        address: 00:80:c8:46:2b:c0
        media: autoselect (10baseT/UTP) status: active
        inet 194.205.192.15 netmask 0xffffff80 broadcast 194.205.192.127
        atalk 65280.145 range 65280-65534 phase 2 broadcast 65280.145

Now, the powers that be have decided that both these cards should be
connected to the same ethernet and thus we are running (logically)
separate IP networks. However, the kernel keeps reporting:

fan82 /netbsd: duplicate IP address 136.170.145.82 sent
from link address 00:80:c8:46:2b:af
fan82 /netbsd: duplicate IP address 136.170.145.82 sent
from link address 00:80:c8:46:2b:c0

Why should this be? Why is interface de1 apparently being configured to
136.170.145.82 as well? 

Stephen Borrill