Filtering on IPSEC

[Alex Dupre]

Hi All,
I've setup my first IPSEC VPN beetween FreeBSD 8.2 and CheckPoint VPN-1. 
I've used a gif interface for the tunnel, setkey for security policies 
and racoon for ikev1. All is working fine, but I get a strange behavior: 
outgoing packets go via enc0, while incoming packets arrive in gif0. To 
be precise, setting to '3' all the net.enc.* sysctls and sending a ping 
via vpn, I see the echo request, the encapsulated echo request, the 
encapsulated echo reply on enc0 and the echo reply on gif0. Is it 
correct? I expected to see all 4 packets on enc0, and perhaps the 2 
clear packets also on gif0. The current behavior makes impossibile to 
use firewall stateful filtering.

I have also another question (about NAT before IPSEC), but it's 
partially related to this first issue, so I'll wait for a clarification 
before exposing it.

-- 
Alex Dupre