6 Replies Latest reply on Apr 4, 2013 11:56 AM by noor

    How to expand dhcp range using ip helper address on 3430

    ovation766 New Member

      I have one working dhcp scope on a windows server, and have added another scope, different subnet, to try to resolve dwindling ip addresses.

      I have two netvanta 3430 routers, and one vlan,  I've added a secondary ip representing the new scope onto the 3430.  It's

      "connected".  I've created a superscope on the windows server, and it's handing out new addresses from the new scope.  Those addresses

      are not working however and I understand that a udp ip helper address might solve the problem.  I tried setting up the helper address on the

      netvanta, using bootps and domain ports.  I'm sure that i'm clear on whether I need another vlan, or if i'm using the correct ip's to make this

      work successfully. thanks in advance for any ideas.

        • Re: How to expand dhcp range using ip helper address on 3430

          ovation766 - Thanks for posting your question on the forum!


          If possible, can you post your configuration to the thread? Please remember to remove any information that may be sensitive to your network.


          I believe you are on the right track with setting up UDP forwarding for the second scope. However, it would be helpful to review your configuration before offering any suggestions on what may be going wrong.


          Please do not hesitate to let us know if you have any further questions.




            • Re: How to expand dhcp range using ip helper address on 3430
              ovation766 New Member

              Hello Noor - thanks for the reply.  In response to your question, it's a flat network using a T1 running between 2 3430 adtran routers, a bunch of windows servers connecting to one router,  printers, wkstns connected to other router.with a  windows dc running active directory and acting as the only dhcp server.   

              The second scope is  in the C range with a /24 mask, as was the first scope.  and, which

              would expand the number of addresses to roughly 510.  This is temporary fix, because we don't want 1 large

              broadcast domain.  From what I understand, the superscope really just pools all the addresses together,  and hands them out in order, first scope, second scope etc.  It apparently doesn't resolve the issue of addresses in a different

              subnet being able to communicate with the rest of the network, hence the ip helper address requirement.   My question i guess is whether this will actually work with a single lan card in the dc, and secondary ip addresses both on the router and on the dc, and one vlan.  And second question is whether it's even worth messing with all this when I could delete the scopes and just expand the mask to /23 on the dhcp server.