From owner-freebsd-hackers Wed Dec 17 12:02:51 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id MAA08129 for hackers-outgoing; Wed, 17 Dec 1997 12:02:51 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from verdi.nethelp.no (verdi.nethelp.no [195.1.171.130]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id MAA08116 for ; Wed, 17 Dec 1997 12:02:42 -0800 (PST) (envelope-from sthaug@nethelp.no) From: sthaug@nethelp.no Received: (qmail 24947 invoked by uid 1001); 17 Dec 1997 20:02:29 +0000 (GMT) To: abial@korin.warman.org.pl Cc: hackers@FreeBSD.ORG Subject: Re: ifconfig reports bogus netmask In-Reply-To: Your message of "Wed, 17 Dec 1997 19:44:08 +0100 (CET)" References: X-Mailer: Mew version 1.05+ on Emacs 19.28.2 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Date: Wed, 17 Dec 1997 21:02:29 +0100 Message-ID: <24945.882388949@verdi.nethelp.no> Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > And even if you don't want to run unnumbered interface, you waste only 4 > addresses (x.x.x.x/255.255.255.252), and even these can be private (e.g. > 10.x.x.x)... So I don't see that much waste here. Wasting 4 addresses (instead of 2) for point to point links is not a big deal, and we do it all the time. Using RFC 1918 addresses for point to point links on the Internet is not a good idea, because: - You'll get ICMP messages with RFC 1918 addresses as source (think of traceroute). - Many organizations filter RFC 1918 source addresses at their border routers. Thus the corresponding ICMPs will never arrive. Steinar Haug, Nethelp consulting, sthaug@nethelp.no