Reverse mapping on a non-octet boundary

[Mark_Andrews at isc.org]

> Sam Pointer <sam.pointer at hpdsoftware.com> wrote:
> > Hello list;
> 
> > I'm in a bit of a BIND. I am in the process of moving our reverse mapping
> > in-house. We only allocated part of the IP range. Therefore the ISP for thi
> s
> > range has delegated various parts on the in-addr.arpa subdomain to us, thus
> :
> 
> > ;195.167.246.0/27
> > 0-31            IN      NS      ns1.hpdsc.com.
> > 0-31            IN      NS      ns2.hpdsc.com.
> > 0-31            IN      NS      ns3.hpdsc.com.
> > 0-31            IN      NS      ns4.hpdsc.com.
> > ;195.167.246.32/29
> > 32-39           IN      NS      ns1.hpdsc.com.
> > 32-39           IN      NS      ns2.hpdsc.com.
> > 32-39           IN      NS      ns3.hpdsc.com.
> > 32-39           IN      NS      ns4.hpdsc.com.
> > ;195.167.246.40/30
> > 40-43           IN      NS      ns1.hpdsc.com.
> > 40-43           IN      NS      ns2.hpdsc.com.
> > 40-43           IN      NS      ns3.hpdsc.com.
> > 40-43           IN      NS      ns4.hpdsc.com.
> 
> > That bit I understand, all well and good (BTW: this hasn't updated yet if
> > you go to check).
> 
> > Now, the bit I am missing is how do I set-up my in-addr domains my end? Can
> > I simply have a large '246.167.195.in-addr.arpa.' Zonefile to handle the
> > whole lot? In my mind I can, as the query of anything above
> > '43.246.167.195.in-addr.arpa' will be sent to whatever the ISP has delegate
> d
> > this subdomain too.
> 
> No, not in this case ( unless your provider makes adjustments )
> 
> What your provider delegated is 3 zones :
> 0-31.246.167.195.in-addr.arpa.
> 32-39.246.167.195.in-addr.arpa.
> 40-43.246.167.195.in-addr.arpa.
> 
> You will setup 3 zonefiles, ( zone "0-31.246.167.195.in-addr.arpa" { ... )
> with contents exactly as if you owned the 246.167.195.in-addr.arpa :
> 
> @	IN SOA ( ...
> 	IN NS  xxx
> 	IN NS  yyy
> 1	IN	PTR	firsthost.domain.tld.
> 2	IN	PTR	secondhost.domain.tld.
> etc
> 
> If you could convince your provider to delegate all three ranges as :
> 
> hpdsc	IN      NS      ns1.hpdsc.com.
> hpdsc	IN	NS	ns2.hpdsc.com.
> 
> and in their CNAME replace "[0-31|32-39|40-43]" with "hpdsc" 
> 
> you would of course be autorative for "hpdsc.246.167.195.in-addr.arpa." 
> and could have all your PTR in this file.

	or  0-43.246.167.195.in-addr.arpa.  Specifying the range
	allows for non aligned delegations.
 
> > This is the way we have our in-addr.arpa set-up for our other ISP; but they
> > use the RFC2317 method of having CNAME records pointing all over the place 
> -
> > as opposed to a straight delegation such as this.
> Hmm, the above IS rfc2317 method. Whats the difference ?
> 
> 
> > Any help would be appreciated.
> 
> > Sam Pointer
> > UNIX, Security & Network Administration
> > HPD Software Limited
> > Tel: + 44 (0) 20 8780 6800
> > Fax: + 44 (0) 20 8780 6801
> 
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> 
> 
> 
> 
> -- 
> Peter Håkanson         
>         IPSec  Sverige      ( At Gothenburg Riverside )
>            Sorry about my e-mail address, but i'm trying to keep spam out,
> 	   remove "icke-reklam" if you feel for mailing me. Thanx.
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org