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Date:      Tue, 30 May 2017 16:22:05 +0000
From:      "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
To:        "Kajetan Staszkiewicz" <vegeta@tuxpowered.net>
Cc:        freebsd-pf@freebsd.org
Subject:   Re: pf not checking traffic from tunnels
Message-ID:  <E08E37F7-F5E3-4079-8A1D-5126AADF1B8A@lists.zabbadoz.net>
In-Reply-To: <1853600.RL7SYQSJBX@energia>
References:  <1853600.RL7SYQSJBX@energia>

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On 30 May 2017, at 16:17, Kajetan Staszkiewicz wrote:

> Hello,
>
> I have a setup where FreeBSD-based routers serving datacenters are 
> connected
> via gif tunnels which are additionally encrypted using transport mode 
> IPsec.
> Each router runs pf and provides firewalling between multiple VLANs. 
> Tunnel
> interfaces were always trusted, though.
..

> Is there any option to check from userspace if the gif interface has 
> pf
> attached in netpfil hook for incoming traffic? Running tcpdump on gif
> interface correctly shows incoming icmp echo request.


What you want to read is
	man 4 enc
I think.

/bz



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