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ISP DHCP shutting down internal DHCP

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by longennamer 1 view

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Our ISP just installed a DHCP server (we won't be using it, we have static IP address for internet). Our NT box has two NIC cards, one for local network, the other connected to our cable modem. It has DHCP server running for our local workstationsto get their ip addresses. But it has been shutting down with an error message stating that "The DHCP server is shutting down because another DHCP server with IP address of 172.29.0.2 is active on the network." 172.29.0.2 is our ISP's new DHCP server. How can I get our server to ignore the ISP's DHCP server?

5 replies

by longennamer

I am using the Microsoft DHCP server that came with NT 4.0, and I can't find how to configure it to not listen for requests on the cable NIC. How do I do it?

by curlergirl

Are you certain that your NIC that is connected to the cable modem has a static IP, not just an IP reservation on the ISP's DHCP server? Also, is your internal NIC set to use a static IP address? The only reason I can think of for this to happen is if one of the NIC cards on your server is set to use DHCP rather than a static IP address. BOTH of your server NICs should be set to use static IPs; the DHCP client service on your server should be disabled (assuming this is a WINNT server, not Win2K). Also, are your internal IP's on a private, separate subnet from your external IP address? If not, your DHCP server might have an overlapping scope with your ISP's DHCP server. You want to make sure that your internal address scope is privateso that there will be no conflicts with any external address. Hope this helps!

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