WLC 2106 CPU ACL Preventing Client from Getting DHCP traffic

Unanswered Question
May 1st, 2007


Here is my portion of ACL List applied on the Controller CPU.

- permit UDP DHCPServer DHCPCLient Any Outbound

- Permit UDP

DHCPClient DHCPServer Any Inbound

The DHCP server is connected to a Cisco Switch on different VLAN.

When I enable the CPU ACL. The client couldn't get any IP address.

But when I disable the CPU ACL. the clients have no problem getting the IP Address.

what could be wrong here?many thanks

I have this problem too.
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jwadleigh Fri, 08/24/2007 - 12:57

If your DHCP server is on a different subnet than your clients, then you'll have to set up a helper address so that clients can cross L3 to reach the DHCP server.

Apply the following command to the router interface facing the client:

ip helper-address


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