I have a Pix 501 setup as DHCP server to the LAN. I have a bunch of HP computers with XP SP3 that cannot get an IP address from the Pix. These computers try, but then just go to limited or no connectivity. If I put a static IP on these computers, they work fine. If I plug my vista laptop directly into the Pix, it gets a DHCP address. If I plug my vista laptop into one of the cables that goes to one of the HP computers, my laptop gets a DHCP address. The Pix does a site to site VPN to another network that has a DHCP server as well, but that shouldn't matter as each side of the VPN is on a different subnet. Any ideas?