We have a easy vpn connection between a asa5505 (Client) and a pix515 (server) which works fine except the dhcp-relay. The problem is that the dhcp request from the client behind the asa is blocked on the pix because the asa sends the request with the outside interface ip address. The asa get's the outside ip address dynamically from the ISP over PPPoE. If the dhcp request would be send with the inside interface ip address it would work. I didn't find a way to solve the problem. Is it even possible to solve the problem the way I want it?