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DHCP Problem with 4400 Controller

I have issues with wireless client receiving DHCP address on a particular VLAN. The DHCP server for this WLAN is also the default gateway (PIX).

Here is my configuration.



SSID: Guest

Dynamic Interface: VLAN990

The Dynamic interface is configured as follows:,, G/W Primary DHCP Server

When I use static address for wireless clients, all works well. When I configure a internal DHCP server, all works well.

The debug message I receive is that a DHCP request received on a directly connected port must be sent to a external DHCP server ( No response from the PIX (DHCP Server).

Can it be the PIX not responsing to the DHCP request since it is a DHCP Relay message?

Your help is appreciated.

Mark Nigh

Cisco Employee

Re: DHCP Problem with 4400 Controller

Hi Mark,

This is a common problem and you are dead on correct with your suspicion: The PIX does not reply to requests from DHCP Relay Agents (which is what the controller is doing). Therefore, you have to either choose an alternate DHCP Server that DOES support requests from a DHCP Relay Agent OR go with the internal scope on the controller.


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