Excerpts from netbsd: 15-Jun-98 Re: arping for 127.0.0.1 Ignatios
Souvatzis@theor (599*)

> > For any given interface, 
> > we should only respond to ARP requests for our IP address(es)
> > on _that_ interface.
> 
> Yes. Thats what the code in sys/netinet/if_arp.c:in_arpinput() ensures (or
> at least, tries to).

Hmm. It seems to fail in other situations too. When I put a second
ethernet interface, connected to the same wire, into my machine
and assign it an address, I get these "duplicate IP address sent
from x:y:z..." -- 2 times, one from every interface.

best regards
Matthias