Here's something strange. Got a console message today with:

pineapple /netbsd: arp info overwritten for 89ef0115 by 00:00:c0:56:4b:af
pineapple /netbsd: arp info overwritten for 89ef0115 by 00:47:43:22:35:24
pineapple /netbsd: arp info overwritten for 89ef0115 by 00:00:c0:56:4b:af

with datestamps.  There's a second as-yet unconfigured A2065 card in
the machine <A3000, lots of drives, it's a fileserver>, alongside the
configured one hooked up to the LAN - this is something to do with
the ARP cache, isn't it?  In which case - is the cache stored
*inside* the kernel?  <Hence the use of 'overwritten' and '/netbsd'?>