reverse zone file network portion

[Mark_Andrews at isc.org]

> Hello
> 
> I am setting up a reverse zone file for a network portion give to us
> by our isp.
> 
> I have 213.161.84.64/27, but for some reason the reverse zone only
> works if I specify 84.161.213.in.addr.arpa but not
> 64/27.84.161.213.in.addr.arpa or 64-95.84.161.213.in.addr.arpa (I take
> it these mean the same). Is this because the isp has to delegate
> something ?
> 
> It only works with the zone definition below (I can resolve
> 213.161.84.92 on the dns server) but I believe I should only define my
> own network portion.
> 
> 
> My /etc/named.conf is
> 
> zone "84.161.213.in-addr.arpa" in {
>         type master;
>         file "named.rev";
>         allow-query { "any"; };
> 
> And my named.rev is
> 
> $TTL 86400 
> @       IN      SOA     ns2.issolutions.co.uk.
> postmaster.ns2.issolutions.co.uk. (
>         2001031900      ; Serial Number CCYYMMDDNN 
>         43200           ; Retry
>         3600            ; Refresh
>         604800          ; Expire
>         86400 )         ; Ttl
> 
>         IN      NS      ns2.issolutions.co.uk.
> 92      IN      PTR     ns2.issolutions.co.uk.
> 
> 
> Could someone tell me what I need to do, or if I have an error in my
> named files.
> Thankyou.
> 

	As Barry said you need to talk to your ISP.  If they do RFC
	2317 style delegations you will want to be a slave for
	84.161.213.in-addr.arpa in addition to be a master for the
	sub-zone.  This will provide you with access to the CNAMEs
	when your external link is down allowing local reverse
	lookups to succeed.

	e.g.
		zone "84.161.213.in-addr.arpa" {
			type slave;
			file "84.161.213.in-addr.arpa";
			masters { 207.126.96.162; 207.126.105.146; };
		};

		zone "64-95.84.161.213.in-addr.arpa" {
			type master;
			file "64-95.84.161.213.in-addr.arpa";
		};

	Also take care you used "in.addr.arpa" three times above when
	it should have been "in-addr.arpa".

	You zone fragment looks sensible.

	Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org