Why is this 10.x.x.x address hitting port 68?

[manywele]

Can any networking gurus explain to me what's going on here?

I'm in a house with 4 people. We have cable that goes to a modem and then to a switch and we get 4 public IP addresses. If I traceroute to my friend (who is in the house) it passes through 10.184.80.1 and then gets to him. When I look at my firewall logs I see this same address hitting port 68 every couple of minutes.

What is this address and why is it hitting port 68 every couple of minutes?
What is port 68? /etc/services says it is BOOTP client and google isn't very forthcoming on the subject of what this is.

[dice]

BOOTP was the predacessor to DHCP, they use the same port. That 10net address is probably some box belonging to your ISP, back when I used to have Sprint I always used to see these ICMPs from 10net addresses hitting my firewall (I'd blocked all incoming traffic from RFC 1918 addresses), took me a while to figure out that was the mysterious invisible server that was two hops out from my firewall.

If you're DHCPing your addresses I'd use tcpdump or ethereal to take a look at that traffic and figure out if it's trying to update lease times on your DHCP address or something.