Filtering inside IPSec tunnel

[Michael Proto]

2011/10/11 Виталий Владимирович <artemrts at ukr.net>:
>
>  I have the IPSec tunnel FreeBSD <-> CISCO. Tunnel works fine but I can filtering traffic inside tunnel with PF.
>
> pf.conf
>
> ......
>
> ipsec_if="gif0"
>
> .......
> block in all
> block out all
>
> ### EXT_IF_OUT
>
> pass out log quick on $ext_if inet from ($ext_if) to any modulate state
>
> ### EXT_IF_IN
>
> pass in quick on $ext_if inet proto udp from $cisco to ($ext_if) port 500
> pass in quick on $ext_if inet proto {esp ah ipencap} from $cisco to ($ext_if)
>
> ### IPSec VPN INTERFACE
> #pass in quick on $ipsec_if inet from any to $ipsec_if
> #pass out quick on $ipsec_if inet from $ipsec_if to any
> block quick on $ipsec_if
>
> But I still ping the second point of IPSec tunnel.
> Where is my mistake?

IIRC you also need the following in your kernel config:

options         IPSEC_FILTERTUNNEL

(I think it used to be called IPSEC_FILTERGIF, depending on what
version of FreeBSD you're running)


-Proto