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W2K Server, DHCP and Superscopes

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5 replies

by mcglinchey

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I have a DHCP server running W2K with a superscope and 5 scopes underneath. The problem is that one scope is down to 3 IP addresses but out of the total 5 scopes, I have a total of 189 IPs available. I can disable the one scope that's down to 3 IP addresses and then DHCP starts handing out from a 2nd scope. Why doesn't DHCP hand out IP addresses evenly across all scopes? I've run into trouble where the one runs out all together and DHCP stops handing out IP addresses. Any thoughts would be appreciated... If you need more information or a clearer explaination, please let me know.

Thanks,
Laura

5 replies

by cg it

well personally if you have a superscope and 5 scopes and your running out of IP addresses, it's really time to think about segmenting the network into smaller more easily manageable networks.

by mcglinchey

Unfortunately, the ip addressing scheme is handled at headquarters. We have a network like this: 172.15.0.0/25 so we have lots of subnets for lots of different office locations. Our office grew faster than others so we were given piecemeal subnets. 172.15.176 low and high, 176.15.233 low, 176.15.234 high and 176.15.235 high. The router is on the 234 subnet. Thats the subnet that runs out of IP addresses and the dhcp server doesn't what to evenly distribute from the other subnets. Any ideas?

Thanks,
Laura

by cg it

if you have many physically seperate office locations and you have DNS servers there [which for log in is a pretty good idea, it's probably best to add a DHCP server on the DNS server and make each office it's own network. Using a Class C in each office gives that DHCP server 253 hosts[with the server IP reserved].

Superscoping is ok but an administrative nightmare. If your running out of IPs and you cant steal anymore bits to create subnets might be time for rethinking the DHCP structure.

by mcglinchey

You are right, it's an administrative nightmare. My current problem, however, is that I have 189 IPs available between all 5 scopes combines but DHCP stops when one particular scope runs out of IPs even though the remaining 4 scopes have plenty of addresses.

by zaferus

Have you considered running a multinet instead? A layer 3 switch could help you with multiple DHCP scopes.

Or run a class "B" subnet and then you should have a lot more IP's opening up to you in your scope (I believe it goes from 254 to 16k per subnet)?

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