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DHCP relay through a site-to-site VPN

brokentwig brokentwig is offline
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Join Date: Jun 2007
Posts: 1
I had a very similar issue as above. I couldn't really find an answer on how to relay dhcp requests through a tunnel. I called the TAC and got the answer. Turns out the dhcprelay uses the outside address of the PIX as the source address. You have to add the outside address to the interesting traffic ACL (match address) as well as the nat 0 ACL:

access-list NoNAT permit IP outside_address dhcpserver_address
access-list VPN_Interesting permit IP outside_address dhcpserver_address

And the reverse on the other end. Works like a champ.
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