Another quick question.

What does the following mean?
arplookup: unable to enter address for 
192.168.100.1@00:50:da:a4:53:25 on ne2 (host is not on local network)
arp info overwritten for 24.XX.XX.1 by 00:09:12:80:90:54
arp info overwritten for 24.XX.XX.1 by 00:09:12:80:90:8c

(I replaced the addresses shown with XX.XX myself)

I noticed this on my console (in dmesg too).  Normally I ssh to my 
box so I didn't see this until the other day.  I've got an internal 
network on 192.168.0.0/24 but it's supposed to be firewalled so it 
shouldn't be going out of my network.