arp moved from [mac address] to [mac address]

[netgeek at speakeasy.net]

The Internet connection is through AT&T Broadband, using DHCP. When I boot, the DHCP connection is up correctly and all works. Within five minutes a series of messages like

pi /kernel: arp: 66.41.23.107 moved from 00:02:dd:30:0a:00 to 00:02:dd:30:4a:e2 on dc0
pi /kernel: arp: 66.41.23.107 moved from 00:02:dd:30:4a:e2 to 00:02:dd:30:0a:00 on dc0

(The IP and MAC addresses are not accurate, sorry.)

As soon as this happens I cannot access anything on the Internet (IP or domain name), but the link lights stay on and ifconfig reports no change.

Are these related, and if so what is the fix?

This isn't my computer, and I'm 40 minutes away from it, so if this question needs information it might be slow in coming.

-- 
Mike Burns <netgeek at speakeasy.net> <http://netgeek.ws>
"Gentlemen, you can't fight here -- this is the War Room!" - Dr. Strangelove