Filtering on IPSEC

[VANHULLEBUS Yvan]

Hi.

On Wed, Jan 11, 2012 at 08:14:24PM -0600, David DeSimone wrote:
> Alex Dupre <ale at FreeBSD.org> wrote:
> >
> > 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.
> 
> I've peered with Checkpoint VPN's using FreeBSD but I never needed to
> use gif interfaces to make it happen.  FreeBSD's tunnel-mode IPSEC seems
> to interoperate quite well with Checkpoint's implementation.
> 
> You should be able to match tunneled traffic using SPD's like so:
> 
> spdadd 10.27.37.0/24    172.30.101.0/24  any -P in  ipsec esp/tunnel/192.250.40.23-238.55.55.15/unique;
> spdadd 172.30.101.0/24  10.27.37.0/24    any -P out ipsec esp/tunnel/238.55.55.15-192.250.40.23/unique;
> 
> With the matching 'sainfo' sections in racoon's config:
> 
> sainfo  address  10.27.37.0/24 any   address  172.30.101.0/24 any
> {
>     lifetime            time    1 hour;
> 
>     encryption_algorithm        aes;
>     authentication_algorithm    hmac_sha1;
>     compression_algorithm       deflate;
> }

Just for information, since ipsec-tools 0.7.0, the sainfo for
"incoming SA" is not needed anymore: you just need a sainfo for
"local->peer" traffic.

> sainfo  address  172.30.101.0/24 any   address  10.27.37.0/24 any
> {
>     lifetime            time    1 hour;
> 
>     encryption_algorithm        aes;
>     authentication_algorithm    hmac_sha1;
>     compression_algorithm       deflate;
> }


So this one will be enough.



Yvan.