4400 Controller Dropping DHCP Packets

Unanswered Question
Jul 30th, 2008

We have a working wireless set up with an external DHCP server. We just tried to set up a new one but we are faced with this issue:

Client DHCP requests are forwarded from the controller to the serve. The server sees the requests and assigns addresses but for some reason the clients aren't able to get them. From what I'm reading around the 'net it looks like it could be an Option 43 setting or that th controlles is dropping the request. If anyone has ideas it would be much appreciated.

Cisco 4400 Controller with software ver.


I have this problem too.
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slapham Wed, 07/30/2008 - 20:31

Do you have an Option 43 setup for the clients, or for the AP's to connect to the controller over a L3 link? In the Interface setup that the WLAN is linked to, did you add or change the IP address to the list of DHCP servers for that link. The controller pretty much forwards everything on to the LAN, but then restricts the packets from the LAN to the WLAN. I hope this helps.

jaharoni Thu, 07/31/2008 - 07:34

Thanx for the response. Actually, it turns out that DHCP prxy had to be disabled and you can only do that thru the CLI apparently.


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