DHCP nack

After adding a 1394 connection between two XP Pro PC's on
my home network, one of the PC's can no longer get a DHCP
address from the MN720 base station for its internet
connection. They were working receiving DHCP addresses
previously. Now the troublesome one gets a DHCPNACK
response no matter what I do. To summarize what I've
tried:
- I've reset the base station
- I tried assigning IP addresses to the two 1394 cards
- I've removed them from the network bridge

Is DHCP an issues for the MN 720?

Thanks