From owner-freebsd-hackers Wed Dec 17 14:05:46 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id OAA18477 for hackers-outgoing; Wed, 17 Dec 1997 14:05:46 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from echonyc.com (echonyc.com [198.67.15.2]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id OAA18449 for ; Wed, 17 Dec 1997 14:05:32 -0800 (PST) (envelope-from benedict@echonyc.com) Received: from localhost (benedict@localhost) by echonyc.com (8.8.7/8.8.7) with SMTP id RAA23962; Wed, 17 Dec 1997 17:05:09 -0500 (EST) Date: Wed, 17 Dec 1997 17:05:09 -0500 (EST) From: Snob Art Genre To: sthaug@nethelp.no cc: abial@korin.warman.org.pl, hackers@FreeBSD.ORG Subject: Re: ifconfig reports bogus netmask In-Reply-To: <24945.882388949@verdi.nethelp.no> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk This is only a problem if you want everyone to see your network topology. But why would someone need to traceroute you from another AS? On Wed, 17 Dec 1997 sthaug@nethelp.no wrote: > > 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 > Ben "You have your mind on computers, it seems."