From owner-freebsd-questions Thu Oct 24 12:54:47 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id MAA17527 for questions-outgoing; Thu, 24 Oct 1996 12:54:47 -0700 (PDT) Received: from vdp01.vailsystems.com (root@vdp01.vailsystems.com [207.152.98.18]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id MAA17522 for ; Thu, 24 Oct 1996 12:54:45 -0700 (PDT) Received: from crocodile.vale.com (crocodile [204.117.217.147]) by vdp01.vailsystems.com (8.7.5/8.7.3) with ESMTP id PAA04234; Thu, 24 Oct 1996 15:05:47 -0500 (CDT) Received: from jaguar (jaguar.vale.com [204.117.217.146]) by crocodile.vale.com (8.7.5/8.7.3) with SMTP id OAA06188; Thu, 24 Oct 1996 14:52:52 -0500 (CDT) Message-ID: <326FCB58.6109@vailsys.com> Date: Thu, 24 Oct 1996 15:02:32 -0500 From: Hal Snyder Reply-To: hal@vailsys.com Organization: Vail Systems, Inc. X-Mailer: Mozilla 3.0 (WinNT; I) MIME-Version: 1.0 To: questions@freebsd.org CC: "Ben Black John Brann" Subject: Re: DNS, reverse subnets References: <199610241657.MAA25638@doorman.brann.org> <9610241856.AA14296@squid.gage.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Ben Black wrote: > > >I am having trouble with the reverse resolution (i.e. converting my > >IP address back into the hostname). All the examples I have are based on > >converting whole networks, is there something different about the '.rev' > >file when only resolving one address? > > > > you can't do it. DNS currently has no support for classless addressing so > blocks smaller than a class C cannot be delegated. your provider will have > to handle the reverse DNS for you. I think this is in BIND (aka named) 4.9.4, supporting RFC 1101. Vixie spoke on this at the October LISA - I don't see detailed references after a quick net search, but the tutorial included something like: [with apologies to the *real* foobar.com] $ORIGIN foobar.com. net ptr 0.33.168.192.in-addr.arpa. net2 ptr 64.33.168.192.in-addr.arpa. $ORIGIN 33.168.192.in-addr.arpa. 0 ptr net.foobar.com. a 255.255.255.224 ; /27 64 ptr net2.foobar.com. a 255.255.255.248 ; /29 I haven't had a chance to try it myself yet.