If I'm not mistaken, the 00:01:03 block belongs to 3Com. Check to see if 
you've got any machines with 3Com NICs. Check your DSL modem - it may be 
trying to provide NAT services itself. Otherwise, see if the MAC listed 
is that of your ex0, and make sure the two LANs are physically 
seperated. I don't THINK netbsd will forward ethernet frames across 
interfaces, unless the bridge device is configured and enabled, but... 
perhaps something has changed...

Steven Sartorius wrote:

> On a 1.6.2_RC3 system my message log is getting the following:
> '00:01:03:7c:a1:40 on rtk0 tried to overwrite arp info for 192.168.0.1 on
> lo0'  a couple of times a day.  The rtk0 interface is connected to my DSL
> modem and has a static IP address assigned by my ISP.   As this box serves
> as a firewall/router for my home network I have another NIC (ex0) which has
> the 192.168.0.1 address.  I'm not a sys admin (nor do I play one on TV) so
> I'm not quite sure what this means.  Any thoughts...??
> 
> Thanks,
> 
> Steve
>