From owner-freebsd-current@FreeBSD.ORG Thu Dec 18 11:38:00 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B8E5D16A4CE for ; Thu, 18 Dec 2003 11:38:00 -0800 (PST) Received: from postal2.es.net (proxy.es.net [198.128.3.206]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0D6F243D31 for ; Thu, 18 Dec 2003 11:37:59 -0800 (PST) (envelope-from oberman@es.net) Received: from ptavv.es.net ([198.128.4.29]) by postal2.es.net (Postal Node 2) with ESMTP (SSL) id IBA74465; Thu, 18 Dec 2003 11:37:57 -0800 Received: from ptavv (localhost [127.0.0.1]) by ptavv.es.net (Tachyon Server) with ESMTP id DECA25D04; Thu, 18 Dec 2003 11:37:55 -0800 (PST) To: David Malone In-Reply-To: Message from David Malone <20031218191102.GA97360@walton.maths.tcd.ie> Date: Thu, 18 Dec 2003 11:37:55 -0800 From: "Kevin Oberman" Message-Id: <20031218193755.DECA25D04@ptavv.es.net> cc: freebsd-current@freebsd.org cc: Eugene Subject: Re: ipv6 only host - problems (5.2-current) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Dec 2003 19:38:00 -0000 > Date: Thu, 18 Dec 2003 19:11:02 +0000 > From: David Malone > Sender: owner-freebsd-current@freebsd.org > > On Thu, Dec 18, 2003 at 06:12:14PM +0100, Eugene wrote: > > i dont want an ip dual-stack, i want an ipv6-only ip stack... > > The KAME stack, as it exists in FreeBSD, requires INET support for > INET6 to work. I don't know if there has been work in KAME to change > this. > > It is certainly possible to have FreeBSD runnign without IPv4 being > configured. For example, I have a router where IPv4 is only configured > on the loopback interface. I noticed that things like ntpd can still > recieve IPv4 multicast/broadcast packets even if you don't have > IPv4 explicitly configured on an interface. I use ipfw to stop any > broadcast/multicast traffic from getting in. > > David. > > # ipfw show > 00100 0 0 allow ip from any to any via lo0 > 00200 0 0 deny ip from any to 127.0.0.0/8 > 00300 0 0 deny ip from 127.0.0.0/8 to any > 00400 170247 28972437 deny ip from any to any > 65535 0 0 allow ip from any to any As far as I recall, the RFC for IPv6 mandates support for (though not use of) IPv4. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634