I figured I'd try it, but I can't get my SSH Sentinel client (road-warrior style connection) to even acknowledge that the Smoothwall server does IKE. I'm using Smoothwall GPL with a single VPN:

inside: 192.168.0.9=192.168.0.0/24
outside: 172.16.0.9=0.0.0.0

But of course I've tried smaller outside subnets. No luck. Fixed (shared-secret) keys, by the way. Should I be able to ping the outside interface from the outside? Or will the ipsec "interface" not allow that?