From owner-freebsd-questions Fri Jan 25 9: 6:10 2002 Delivered-To: freebsd-questions@freebsd.org Received: from relay3-gui.server.ntli.net (relay3-gui.server.ntli.net [194.168.4.200]) by hub.freebsd.org (Postfix) with ESMTP id 2189537B400 for ; Fri, 25 Jan 2002 09:06:02 -0800 (PST) Received: from pc3-card4-0-cust122.cdf.cable.ntl.com ([62.254.251.122] helo=rhadamanth.private.submonkey.net ident=exim) by relay3-gui.server.ntli.net with esmtp (Exim 3.03 #2) id 16U9nY-00072N-00; Fri, 25 Jan 2002 17:05:56 +0000 Received: from setantae by rhadamanth.private.submonkey.net with local (Exim 3.34 #1) id 16U9nU-0000Jy-00; Fri, 25 Jan 2002 17:05:52 +0000 Date: Fri, 25 Jan 2002 17:05:52 +0000 From: Ceri To: Jonathan Chen Cc: freebsd-questions@freebsd.org Subject: Re: Reverse-ptr entry under DNS Message-ID: <20020125170552.GA1108@rhadamanth> Mail-Followup-To: Ceri , Jonathan Chen , freebsd-questions@freebsd.org References: <3C508458.1030705@wapsolutions.co.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3C508458.1030705@wapsolutions.co.nz> User-Agent: Mutt/1.3.27i Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, Jan 25, 2002 at 11:02:00AM +1300, Jonathan Chen wrote: > Hi, > > Here in NZ, I've noticed that IP addresses allocated for ADSL > connections have odd reverse-ptr entries: > eg: > > dig -x 203.96.91.96 > [...] > ;; ANSWER SECTION: > 96.91.96.203.in-addr.arpa. 24m1s IN CNAME > 96.96-127.91.96.203.in-addr.arpa. > > ;; AUTHORITY SECTION: > 91.96.203.in-addr.arpa. 3d23h24m1s IN NS reliant.netgate.net.nz. > 91.96.203.in-addr.arpa. 3d23h24m1s IN NS defiant.netgate.net.nz. > > If I use: > > nslookup -type 203.96.91.96 > I eventually get the name associated with the IP. > > Is it legal to have CNAMEs for in-addr.arpa addresses instead of > PTR? I ask this 'cos the freebsd.org mailservers don't seem to > think so, and it's refusing to accept email directly from these IPs. Kind of. Read RFC2317. I think it's an ugly hack, but that's just my opinion. And it should work, yes. Ceri -- keep a mild groove on To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message