From owner-freebsd-hackers Tue Jun 11 16:40:20 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from boreas.isi.edu (boreas.isi.edu [128.9.160.161]) by hub.freebsd.org (Postfix) with ESMTP id D3D4737B40C for ; Tue, 11 Jun 2002 16:40:04 -0700 (PDT) Received: from isi.edu (fuolfjyujwboblaa@hbo.isi.edu [128.9.160.75]) by boreas.isi.edu (8.11.6/8.11.2) with ESMTP id g5BNe3r08428; Tue, 11 Jun 2002 16:40:03 -0700 (PDT) Message-ID: <3D068A51.1060302@isi.edu> Date: Tue, 11 Jun 2002 16:40:01 -0700 From: Lars Eggert User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.0rc3) Gecko/20020528 X-Accept-Language: en-us, de-de MIME-Version: 1.0 To: John Nielsen Cc: hackers@FreeBSD.ORG Subject: Re: gif(4) tunnel through MSN DSL modem References: <015301c2117d$0db539c0$0900a8c0@max> <3D06761F.7000904@isi.edu> <01c601c2119f$e3e9ae50$0900a8c0@max> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms000506090205020502010201" Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG This is a cryptographically signed message in MIME format. --------------ms000506090205020502010201 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit John Nielsen wrote: >>># "Public" interface -- 192.168.1.2 netmask 255.255.255.252" >>>ifconfig_ed0="DHCP" >>>gif_interfaces="gif0" >>>gifconfig_gif0="DSL.public.ip myend.public.ip" >>>ifconfig_gif0="192.168.6.1 192.168.0.1" >>>static_routes="john" >>>route_john="-net 192.168.0 -interface gif0" >> >>The problem (one part, at least) is that you use the same IP address >>(192.168.6.1) on your xl0 and gif0 interfaces (on both ends). You'll >>want the tunnel addresses to be in a different subnet. > > I have another tunnel set up this way and it works fine. Why should the > tunnel addresses be on a different subnet? Because your routing table will have an entry that says "to reach net X use gateway Y", and there will appear to be multiple ways to reach gateway Y if you have multiple addresses attached to the same subnet. Also, assigning the same IP address to multiple interfaces is usually a bad idea. (It is useful in some setups, but this ain't one.) Add encapsulation, and you've a fine example of black hole due to infinite encapsulation. >>Also, the netmask in the infconfig_xl0 line doesn't match the comment, >>which one is wrong? > > The public interface (ed0) always gets the same address from the DSL modem, > even though it's using DHCP. I think you associated the comment with the > wrong ifconfig line (I've added a break between them to clarify). Oh, you're right, sorry. But then you're assigning the same IP address to THREE interfaces! > I'm starting to think that it would be easier to use ppp/tun and ssh rather > than gif in this instance, even though I'm less familiar with that > arrangement. I'm willing to bet a beer that these problems will dissappear if you pick different subnets and IP addresses for your interfaces. This is a pretty straightforward setup. 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