Cisco IP helper / DHCP Issue

Posted on 2003-11-04
Last Modified: 2012-05-04
We have a branch (branch C) that will not pull dhcp even though we have setup the ip helper and we have it working at other branches.  Basically the DHCP server is two hops away.  We tried to setup a DHCP server 1 hop away for testing and it would not grab there either.  Any thoughts on where to start??? Since we have it working at other branches we're a bit stumped.

Question by:CameronFrasnelly
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2

Author Comment

ID: 9683734
Another thing... on the remote routers there are two ip addresses bound to the Ethernet interface and the addresses.  We have an additional ip secondary bound to each of our routers ethernet ports.

Expert Comment

ID: 9684684
Try using the "ip dhcp-server" global command with the ip helper-address command on the far remote router.

Router(config)#ip dhcp-server <ip of dhcp server>

Expert Comment

ID: 9684711
Another thought...   Is the scope on the server for branch C correctly configured with a default gateway address of the primary IP address of the ethernet interface of the router.

Author Comment

ID: 9687919
No... it is set to the secondary which works at 3 other branches just not the one we are currently working on.  We are suspecting an older version of Cisco IOS.

Accepted Solution

NicBrey earned 500 total points
ID: 9687970
You need to have the "ip helper-address" under all the ethernet interface configurations along the path.
Is that configured so??
Also, have you tried with the "ip dhcp-server" global command as well?

What version of the IOS is on each of the routers along the path?

Featured Post

Turn Insights into Action

Communication across every corner of your business is essential to increase the velocity of your application delivery and support pipeline. Automate, standardize, and contextualize your communication processes with xMatters.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

While it is possible to put two routes in place with the secondary having a higher metric, this may not always work. In the event of a failure that does not bring down the physical interface on the router the primary route is not removed. There is a…
In the world of WAN, QoS is a pretty important topic for most, if not all, networks. Some WAN technologies have QoS mechanisms built in, but others, such as some L2 WAN's, don't have QoS control in the provider cloud.
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Suggested Courses

695 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question