Filtering on IPSEC

[Bjoern A. Zeeb]

On 11. Jan 2012, at 18:12 , Alex Dupre wrote:

> 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.

Need more input.  A) why are using gif?  B) are you using transport mode?



> 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.

NAT before IPSEC can be done with ipfw, not with pf, don't know about ipfilter.

-- 
Bjoern A. Zeeb                                 You have to have visions!
   It does not matter how good you are. It matters what good you do!