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DHCP over Frame-Relay

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by jheath

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I have 34 sites with up to 40 users at each site. I have Cisco 1750 & 3610 routers going over frame relay. All sites have different subnets (ex. 128.1.22.X and 128.1.92.X) with router outside interface addresses of 172.16.22.1 and 172.16.92.1. I am trying to centralize all servers at corporate location and am having trouble getting dhcp to work over frame. DHCP server is at corporate location. I eventually will want to be able to see all workgroups and servers in company from any site. I can ping any sites individual pcs or servers from corporate or telnet into the individual routers but nothing else is coming together. How do I get the DHCP server to work over frame and get it to supply the ip address schemes that exist in the individual sites? I am missing some major detail.

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by ckilday

Do you have an IP HELPER-ADDRESS on the ethernet interfaces of the routers that points back to the ip address of your dhcp server? When we implemented dhcp at our shop, we created the individual ranges on the server that matched the network configurations for the ethernet segments (i.e. network address and subnet mask); added the server's ip address to the ethernet interface on each site's router as the "ip helper-address", and then sent desktop technicians out to reconfigure each pc to enablethem for dhcp and remove their fixed addresses. Once the pc configuration is changed and the unit rebooted, it will send out a broadcast looking for a dhcp server. The cisco router will receive the broadcast and forward it across the network to your server based upon the ip helper-address statement. Your server will receive the broadcast and respond with an address from the appropriate range based upon the network source address from the router. I don't believe your frame relay network is at fault as long as it is passing data normally. Hope this helps.
Best wishes,
-ck

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