From owner-freebsd-net Sat Jun 19 19: 8:41 1999 Delivered-To: freebsd-net@freebsd.org Received: from roma.coe.ufrj.br (roma.coe.ufrj.br [146.164.53.65]) by hub.freebsd.org (Postfix) with ESMTP id 9660114BE5 for ; Sat, 19 Jun 1999 19:08:37 -0700 (PDT) (envelope-from jonny@jonny.eng.br) Received: (from jonny@localhost) by roma.coe.ufrj.br (8.8.8/8.8.8) id XAA02886; Sat, 19 Jun 1999 23:08:32 -0300 (EST) (envelope-from jonny) From: Joao Carlos Mendes Luis Message-Id: <199906200208.XAA02886@roma.coe.ufrj.br> Subject: Re: Multiple ethernet frames for IPX In-Reply-To: <199906161602.JAA00643@walker3.apple.com> from "Justin C. Walker" at "Jun 16, 1999 09:02:28 am" To: justin@apple.com Date: Sat, 19 Jun 1999 23:08:32 -0300 (EST) Cc: freebsd-net@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL54 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org #define quoting(Justin C. Walker) // I understand how routing works. What I'm missing is how the // sending host (whether originator or forwarder) decides how to // encapsulate a frame, i.e., in your case, how to chose which virtual // device to use. Is it the case that the network number determines the // encapsulation? Is ARP used, and if so, does the ARP reply dictate // how to encapsulate? Routing choses interface, interface defines frame. Just think of diferent packet frames as virtual networks, completely isolated from each other. If you need to share traffic, you must use a (one armed) router. // I never bothered to figure out the answers to these questions for // IP (which can be encapsulated in E-2 or 802.3/SNAP). If routing decides to send via E-2 interface, it will receive an E-2 frame, and vice-versa. Note that each frame should have its own subnet, completely independent from each other. // > interface knows about frames. // I guess this is an answer to the question: network numbers // determine encapsulation. Is that true? Yes. Jonny -- João Carlos Mendes Luís jonny@jonny.eng.br Networking Engineer jcml@ieee.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message