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Date:      Thu, 24 Apr 2008 18:10:35 +0000
From:      Baldur Gislason <baldur@foo.is>
To:        Steve Bertrand <iaccounts@ibctech.ca>
Cc:        freebsd-net@freebsd.org
Subject:   Re: IPIP tunnel behind NAT
Message-ID:  <20080424181035.GC66873@gremlin.foo.is>
In-Reply-To: <481078F6.9010108@ibctech.ca>
References:  <4808A15E.4030007@ibctech.ca> <20080418133417.GA66873@gremlin.foo.is> <481078F6.9010108@ibctech.ca>

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You need to do do a one-to-one NAT, so protocol 94 (IPIP) packets get forwarded.
It's not TCP or UDP, so no ports there.
Alternatively, you can set up a NAT traversing IPSEC-in-UDP tunnel, but that requires a kernel patch.

Baldur

On Thu, Apr 24, 2008 at 08:11:34AM -0400, Steve Bertrand wrote:
> Baldur Gislason wrote:
> >It'll work fine. I've done this several times before.
> 
> Hmmm. I still can't seem to get this setup to work. The FreeBSD box is 
> in behind a Fortigate 200 unit.
> 
> >However I've also had NAT implementations which didn't work this way but
> >this one should definitely work.
> 
> Are there any ports that need to be opened on the Fortigate to allow the 
> tunnel traffic through? There appears to be no place in the Fortigate to 
> pass protocol 41 traffic.
> 
> Thanks,
> 
> Steve
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