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Date:      Mon, 15 Jul 2002 16:53:03 +0900
From:      Shoichi Sakane <sakane@kame.net>
To:        vulture@consult-scs.com
Cc:        freebsd-net@FreeBSD.ORG
Subject:   Re: IPSEC Tunnel
Message-ID:  <20020715165303Y.sakane@kame.net>
In-Reply-To: Your message of "Tue, 09 Jul 2002 22:07:40 -0700" <3D2BC11C.2000508@consult-scs.com>
References:  <3D2BC11C.2000508@consult-scs.com>

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> Is it not possible to have the internal ip addresses of the tunnel 
> machines talk with other internal addresses on the other side of the tunnel?
> Example Set Up:
> Packets from say 192.168.0.2 to 192.168.1.1 and back
> (192.168.0.0/24 Lan)-(192.168.0.1 Internal)->(200.0.0.1 
> Interface)===IPSEC TUNNEL===(200.0.0.2 Inteface)<-(192.168.1.1 
> Internal)-(192.168.0.1/24 Lan)
> 
> I can see the packets from 192.168.0.2->192.168.1.1 under tcpdump of 
> 200.0.0.2 as a (ipip) Packet from 200.0.0.1->200.0.0.2 having 
> 192.168.0.2->192.168.1.1 listed but the packet just seems to disappear 
> after that. It does not show up under lo0 or the internal interface.

because the network behind the gateway 200.0.0.2 is 192.168.0.1/24
as you descirbed.  any packet to 192.168.1.1 can not be routed by
200.0.0.2.

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