Allowable reverse mapping zone file names
rob0 at gmx.co.uk
Sat Aug 27 19:23:19 UTC 2016
On Sat, Aug 27, 2016 at 10:47:36AM -0500, Tom Browder wrote:
> I do not control 3-octet networks but need reverse mapping for my
> mail server.
Discuss that with your ISP or netblock owner.
> Two questions:
> 1. Where is the doc that completely describes the allowable reverse
> mapping zone file names?
There is no limit within BIND on what you name a zone file. I
suspect you might be wondering about the names of in-addr.arpa.
To use an example, 127.0.0.2, a resolver would request a PTR record
named "220.127.116.11.in-addr.arpa". That is the reversed octets of the
dotted-quad IPv4 address with ".in-addr.arpa" appended.
A zone could exist at any of these names:
(See also RFC 2317 for "classless" reverse DNS delegation, but no,
DO NOT read that: I only mention it for completeness, as we have
pedantic posters on this list ... myself included. ;) )
> 2. When running my own authoritative name servers, do I need
> reverse mapping for anything other than my single mail server?
You only need an in-addr.arpa zone IF that zone has been delegated to
your nameserver[s] by a netblock owner or by your RIR (such as RIPE
for Europe, ARIN for North America, et c.)
If the zone has not been delegated to you, ^^ go back to the top and
talk to your ISP or netblock owner.
If you're still confused, tell us what your IP address is and we
might be able to tell you who to contact.
Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
More information about the bind-users