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Date:      Mon, 4 Dec 2000 13:03:12 -0800
From:      Nicholas Esborn <nick@netdot.net>
To:        Jim Thario <jim@thario.com>
Cc:        freebsd-questions@freebsd.org
Subject:   natd + ipsec
Message-ID:  <20001204130312.A26120@carbon.berkeley.netdot.net>

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I have a similar situation with my home network: a network behind NAT, IPSEC
transport between the NAT host and another host (over the Internet in this
case), but hosts behind the NAT host cannot talk to the other host.

I was thinking this is because IPSec only processes packets originating from
the machine it is running on, not packets being gateway'd.  I can't run IPSEC
in tunnel mode because I don't have a security gateway and private network on
the other host.

I've thought of running a ppp tunnel, but haven't worked out the ipfw config
and would prefer a solution less kludgey.

-nick

Jim Thario wrote:

> We have a network here with public and private subnets. The gateway from the
> private to public subnet runs natd. Recently we configured all nodes on the
> public subnet to converse using IPSEC transport mode. This also includes the
> gateway IP on the public subnet.

> Since the addition of IPSEC we are unable to connect to machines on the
> public subnet from the private subnet. It seems as if the packets that are
> NAT'd through the gateway are byassing IPSEC processing and, of course, the
> machines on the public subnet refuse to accept them.

> Anyone else experience this?

> Thanks in advance,
> Jim



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