From owner-freebsd-doc Thu Dec 19 11:34:29 2002 Delivered-To: freebsd-doc@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4550D37B401 for ; Thu, 19 Dec 2002 11:34:28 -0800 (PST) Received: from sccrmhc03.attbi.com (sccrmhc03.attbi.com [204.127.202.63]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9F4D943ED4 for ; Thu, 19 Dec 2002 11:34:27 -0800 (PST) (envelope-from swear@attbi.com) Received: from localhost.localdomain ([12.242.158.67]) by sccrmhc03.attbi.com (sccrmhc03) with ESMTP id <2002121919342100300lpr1je>; Thu, 19 Dec 2002 19:34:21 +0000 Received: from localhost.localdomain (localhost [127.0.0.1]) by localhost.localdomain (8.12.6/8.12.5) with ESMTP id gBJJXb2J006904; Thu, 19 Dec 2002 11:33:37 -0800 (PST) (envelope-from swear@attbi.com) Received: (from jojo@localhost) by localhost.localdomain (8.12.6/8.12.5/Submit) id gBJJXVJW006901; Thu, 19 Dec 2002 11:33:31 -0800 (PST) (envelope-from swear@attbi.com) X-Authentication-Warning: localhost.localdomain: jojo set sender to swear@attbi.com using -f To: "Jeffrey P.Bogert" Cc: freebsd-doc@freebsd.org Subject: Re: FreeBSD Handbook References: <3E01FA5E.87B6FC46@mitre.org> From: swear@attbi.com (Gary W. Swearingen) Date: 19 Dec 2002 11:33:31 -0800 In-Reply-To: <3E01FA5E.87B6FC46@mitre.org> Message-ID: Lines: 30 User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.1 (Cuyahoga Valley) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-freebsd-doc@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org "Jeffrey P.Bogert" writes: > 2) on page 53 in the section "Netmask" > the Class C block should be 192.168.0.0-192.168.0.255 instead of > 192.168.0.0-192.168.255.255 Many understand this better than I, but let me flag this for review. My copy says: Netmask The address block being used for this local area network is a Class C block (192.168.0.0 - 192.168.255.255). The default netmask is for a Class C network (255.255.255.0). All of which is correct, methinks. That 192.168.0.0 - 192.168.255.255 is the Class C block of addresses reserved for private use on a LAN such as is being configured here. In these sub-netting days, the term "block" needn't be limited to a "natural" Class C network of 256 hosts. Users need not use the default netmask, of course, and might want to use more (or less) of the reserved block than 192.168.0.0-192.168.0.255. Moreover, I've read that 192.168.0.* (and 192.168.255.*) shouldn't even be used, because they are not reliably handled. I'm not sure why; maybe many old routers were buggy; and maybe this is obsolete advice. I DO notice that my fairly recent CISCO-certified study guide uses 192.168.1.* as an example natural Class C network (as oppososed to 192.168.0.*). Maybe the number in "IPv4 address" should be changed. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-doc" in the body of the message