A question about PTR records

[Mark Andrews]

In message <139200.61342.qm at web110505.mail.gq1.yahoo.com>, sasa sasa writes:
> 
> Hi,
> What is the best practice when using PTR in an ISP? is it dividing IP block=
> s (like; x.x.x.in-addr.arpa.) and therefore having more than one PTR zo=
> ne file? or just use x.in-addr.arpa.and include everything inside that fi=
> le?
> regards,

Whatever works best for you.

If you are delegation parts of the in-addr.arpa namespace to others
it is often easier to also delegate the namespace to yourself so
that management is consistant.

If you have RFC 2317 style delegations the parent zone, which
contains the CNAMES, also needs to be transfered to ensure that
reverse lookups continue to work on the subnet using that namespace.
A smaller parent zone is useful in this case.

Smaller zones also reduce the amount of data that needs to be
transferred whenever a change happens.

You can also mix and match.  Note you can change schemes later if you
want to.

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