Date: Thu, 24 Oct 1996 15:02:32 -0500 From: Hal Snyder <hal@vailsys.com> To: questions@freebsd.org Cc: "Ben Black <black@gage.com> John Brann" <jbrann@brann.org> Subject: Re: DNS, reverse subnets Message-ID: <326FCB58.6109@vailsys.com> References: <199610241657.MAA25638@doorman.brann.org> <9610241856.AA14296@squid.gage.com>
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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.
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