DHCP relay on ASA with DHCP server on far end of L2L tunnel

Unanswered Question
Apr 27th, 2010

I have a Cisco 5505 that makes a L2L tunnel to a concentrator at HQ. The tunnel comes up just fine and can ping DHCP server ip from remote LAN. When I enable the DHCP relay, I can see the packet being forwarded on the ASA, but the packet never gets to dhcp server. My guess is the packet just goes out the outside interface and not accross the tunnel. Has anyone gotten this to work?? With a router instead of the ASA I just used a ip helper-address and it worked fine. What am I missing here??

I have this problem too.
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Federico Coto F... Tue, 04/27/2010 - 16:32


On IOS using the ip helper command or an ASA using the DHCP relay function, you need to include the outside IP of the device in the interesting traffic.

Since the DHCP relay is going to be source from the ASA's outside interface, you should include this IP in the interesting traffic on both ends.



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