I recently installed internet security and acceleration server on my Win2k server machine. I was using the standard Routing and remote access in NAT mode. I use a modem that spoofd my ip to the ethernet card so that the modem apears to be transparent. this option worked fine under de routing and r..... I got the ip spoofed lease for 10 minutes,when te lease was in use for over 5minutes it was refresht and another 10minutes was added to that lease.this went on a long as the modem and server stayed online. Now when i installed ISA: I got the lease for again 10minutes but after 5minutes,when i normally receive a refresh ,it stayed.Until the 10minute lease was over resulting in the loosing of the ip lease -> NO INTERNET CONNECTION. MY Q IS NOW , am i blocking the traffic for a refresh of dhcp spoofed lease,which protocol and port should I use. WHAT AM I DOING WRONG???? PLEASE HELP!! sorry for my language ,i am dutch!