I posted this on another forum but there are some knowledgeable that don't post over there so I am gonna post it here too! I am trying to set up a site to site vpn connection and my knowledge is a bit limited. On one side there is a sonicwall nsa 240. The DSL modem on this side is in bridged mode with the sonicwall doing nat & dhcp. On the other side there is a Zywall 2 plus. I don't even know if this will work the way that the network is set up on this side. The DSL modem is not in bridged mode and is doing NAT & DHCP with a 10.0.0.0/24 network. The dsl modem is doing port forwarding with ports 500, 4500, 443. Then the zywall is doing dhcp as well with a 172.16.17.0/24 subnet. The keys match on both sides and phase1 is set up with Main mode; 3des encryption, sha1 authentication, 28800 SA life time, DH1 key group. phase 2 is using tunnel encapsulation mode, esp active protocol, 3des encryption, sha1 authentication 28800, pfs is not enabled. Nat traversal is currently selected on both sides and I'm not sure if that is right heck I'm not even sure if it it will work at all with the network set up like that. Any tips will be greatly appreciated.