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By: Stephanie Hamrick
Table of content
So we’ve run into this problem a couple of times. The symptom is DHCP being issued from a Cisco ASA (multiple devices/versions), but not being “accepted” by the DHCP client. The DHCP client I was testing with was a Windows workstation in this case. The other time we saw it, it was a Mac laptop that couldn’t accept the DHCP offer.
So the ASA or DHCP server makes a valid offer to the client. The client “sees” the offer—if you are on the client, and do an “ipconfig”, you see the gateway address get filled out—but then it will lose the information. The client then requests another address; the DHCP server offers the next address in the pool. This continues till the DHCP runs through all available addresses in the pool.
After testing this both on a wired port for the network and across the WiFi network, the symptoms were the same. Here is the debug from the command “debug dhcpd packets 250” command:
What we see is the client requesting an IP address. Getting a valid DHCP offer, accepting the offer, then requesting again. This continues till the pool is fully depleted.
So what is causing the issue? What we found is that the Cisco WLC was having a WLAN that connected to each of the VLANs that were having this problem. On the WLC web console in the Controller > Advanced > DHCP area, it had Enable DHCP Proxy check on.
To fix the issue, you need to turn the Enable DHCP Proxy off and reload the WLC.
Jason Howe, PEI
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