>My PDC NT 4.0 Server died and I had to promote a backup. Now that the back up has been promoted and the nic for the DSL line installed, my IP address issued from my ISP keeps expiring.
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>The support people are clueless. I only get a 6 hour lease of the ip address and I must reboot the server inorder to get a new lease.
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>I try the ipconfig /renew MTC301 but it comes back saying that the DHCP server could not be found.
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>Ideas?

Your former BDC needs to act as a DHCP server and Proxy server, and needs to insulate your LAN from the DSL interface. I'd suggest that you look at Deerfield's WinGate product to manage the connection; it can provide proxy, DHCP, DNS and a good deal more; I use it both here and at several client sites in preference to the MS-provided services. www.deerfield.com