From owner-freebsd-hackers Fri Dec 7 9: 3:41 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 B646437B416 for ; Fri, 7 Dec 2001 09:03:39 -0800 (PST) Received: from isi.edu (8k5gtu864wklufzx@hbo.isi.edu [128.9.160.75]) by boreas.isi.edu (8.11.6/8.11.2) with ESMTP id fB7H3KN24353; Fri, 7 Dec 2001 09:03:20 -0800 (PST) Message-ID: <3C10F658.6070001@isi.edu> Date: Fri, 07 Dec 2001 09:03:20 -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: Anders Hagman Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Nat through two DSL References: <5.0.2.1.0.20011207131945.009fe1d0@mail.training.telia.se> 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 Anders Hagman wrote: > I want to load share between two ADSL modems using a NAT/Firewall. > > Computer 1 \ > \ /-- ADSL 1 > \ / > Computer 2 ------ Wireless LAN --- Firewall/NAT - > . / \ > . / \-- ADSL 2 > Computer 10/ > > The ADSL are 500k links and I want to load share on session by session. > Can I do NAT between an inside interface and two outside interfaces > acting in a round robin fashion? This may not be the good idea you'd think on first glance. If one of the paths has a slightly different RTT (and they're pretty much guaranteed to), you'll see out-of-order delivery at the receiver. I remember seeing some study that showed that TCP doesn't react too nicely under such conditions (it works, but not at peak performance). 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