From owner-freebsd-net@FreeBSD.ORG Wed May 17 00:55:48 2006 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id BB6EB16A400 for ; Wed, 17 May 2006 00:55:48 +0000 (UTC) (envelope-from jmg@hydrogen.funkthat.com) Received: from hydrogen.funkthat.com (gate.funkthat.com [69.17.45.168]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5B8CB43D46 for ; Wed, 17 May 2006 00:55:48 +0000 (GMT) (envelope-from jmg@hydrogen.funkthat.com) Received: from hydrogen.funkthat.com (y6zelx1trthhkinu@localhost.funkthat.com [127.0.0.1]) by hydrogen.funkthat.com (8.13.4/8.13.3) with ESMTP id k4H0tlfQ018614; Tue, 16 May 2006 17:55:47 -0700 (PDT) (envelope-from jmg@hydrogen.funkthat.com) Received: (from jmg@localhost) by hydrogen.funkthat.com (8.13.4/8.13.3/Submit) id k4H0tkGR018613; Tue, 16 May 2006 17:55:46 -0700 (PDT) (envelope-from jmg) Date: Tue, 16 May 2006 17:55:46 -0700 From: John-Mark Gurney To: Unix-Solutions - Steven Message-ID: <20060517005546.GJ65555@funkthat.com> Mail-Followup-To: Unix-Solutions - Steven , freebsd-net@freebsd.org References: <001301c67946$604b7f70$aa00000a@cloe> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <001301c67946$604b7f70$aa00000a@cloe> User-Agent: Mutt/1.4.2.1i X-Operating-System: FreeBSD 5.4-RELEASE-p6 i386 X-PGP-Fingerprint: B7 EC EF F8 AE ED A7 31 96 7A 22 B3 D8 56 36 F4 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ X-Resume: http://resnet.uoregon.edu/~gurney_j/resume.html Cc: freebsd-net@freebsd.org Subject: Re: /31 on 2 interfaces X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: John-Mark Gurney List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 May 2006 00:55:48 -0000 Unix-Solutions - Steven wrote this message on Wed, May 17, 2006 at 02:10 +0200: > I have 2 servers with both 2x 'em' interfaces in it. > I configged a /31 on both interfaces > em0 in box 1 = 10.0.0.1 > em0 in box 2 = 10.0.0.2 As someone else mentioned even if you did a /31, those addresses aren't on the same network... 254 & 1 == 0 254 & 2 == 2 Hence different networks.. the other thing is that you can't have a /31 due to the fact that one ip w/ all the node bits set is the broadcast for the network causing other sorts of troubles... the smallest usable network is a /30... -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."