From owner-freebsd-stable Thu Apr 22 20:47:39 1999 Delivered-To: freebsd-stable@freebsd.org Received: from shemp.palomine.net (shemp.palomine.net [205.198.88.200]) by hub.freebsd.org (Postfix) with SMTP id A343614CF0 for ; Thu, 22 Apr 1999 20:47:36 -0700 (PDT) (envelope-from cjohnson@palomine.net) Received: (qmail 14602 invoked by uid 1000); 23 Apr 1999 03:45:06 -0000 Date: Thu, 22 Apr 1999 23:45:06 -0400 From: Chris Johnson To: "Bruce A. Mah" Cc: stable@FreeBSD.ORG Subject: Re: netstat -r (fwd) Message-ID: <19990422234506.A14538@palomine.net> References: <199904230059.TAA08580@alecto.physics.uiuc.edu> <199904230125.SAA28802@stennis.ca.sandia.gov> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.4i In-Reply-To: <199904230125.SAA28802@stennis.ca.sandia.gov>; from Bruce A. Mah on Thu, Apr 22, 1999 at 06:25:25PM -0700 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, Apr 22, 1999 at 06:25:25PM -0700, Bruce A. Mah wrote: > If memory serves me right, Igor Roshchin wrote: > > > Check the traceroute I pasted below - that router 10.0.232.27 > > is not on my internal network. (I have NO private IP addresses). > > So, are you saying I need to have all 2^512 (18609625) in my > > /etc/hosts file ???? > > No...it's just that you shouldn't ask Internet nameservers to resolve > address-to-name lookups for private networks. HOWEVER, that said... > > > traceroute to www.home.net (24.0.30.175), 30 hops max, 40 byte packets > > ...you're seeing a rather unfortunate, pathological case. The 10/net > addresses in this case are a part of @Home which, for some reason that > completely eludes me, uses private addresses inside its backbone network. > Although you can't route to intermediate hosts, you can route to endsystems > inside the @Home network. I imagine there's a reason for this, but it > violates the various RFCs that have already been cited. This is from http://www.worldgate.com/~marcs/mtu (an article on Path MTU Discovery and Filtering ICMP). I believe it answers the question of why you'd see RFC 1918 addresses when you do a traceroute: "On many routers, a separate IP address in the same subnet is required for each end of a point to point link. This can use address space if there are a large number of such links. Since the actual address of the links doesn't appear to impact much, many people use RFC 1918 private address space for such links." Chris To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message