From owner-freebsd-hackers Fri Dec 7 10:34:39 2001 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 B123437B419 for ; Fri, 7 Dec 2001 10:34:35 -0800 (PST) Received: from isi.edu (pkv4yrknlapunj9v@hbo.isi.edu [128.9.160.75]) by boreas.isi.edu (8.11.6/8.11.2) with ESMTP id fB7IYRN26114; Fri, 7 Dec 2001 10:34:27 -0800 (PST) Message-ID: <3C110BB3.7080908@isi.edu> Date: Fri, 07 Dec 2001 10:34:27 -0800 From: Lars Eggert User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:0.9.6) Gecko/20011203 X-Accept-Language: en, de MIME-Version: 1.0 To: Nick Rogness Cc: Steve Ames , Anders Hagman , freebsd-hackers@FreeBSD.ORG Subject: Re: Nat through two DSL References: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit 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 Nick Rogness wrote: > On Fri, 7 Dec 2001, Lars Eggert wrote: >>What prevents you from picking one source address for packets going >>out both interfaces? Your return packets won't be striped then of >>course. (Which could make this scheme ineffective, assuming "client" >>machines receive much more than they send.) >> > > Well, you can. But the upstream provider has to be allowing you > to route the other ADSL's IP through their network....probably not > going to happen...unless you have some sort of BGP arrangement > with them. If you have BGP arrangements with them this would be a > moot point. Good point. I keep assuming that the Internet is a nicer place than it really is. But source-based filtering sounds like one of the things providers would do. You could set up IP tunnels to get around this, but this assumes the peer understands this, which makes it useless in the general case. Lars -- Lars Eggert Information Sciences Institute http://www.isi.edu/larse/ University of Southern California To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message