North American Network Operators Group

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RE: is reverse dns required? (policy question)

  • From: cjosephes
  • Date: Wed Dec 01 15:30:22 2004

> Just a quick note: it's not a BCP yet, but it's also considered
> /extremely/ friendly by mail admins and others, if you use a naming
> convention for your rDNS that is easily placed into access.db 
> and other
> "right-anchored" string matching mechanisms. e.g., if you have a
> dynamically assigned DSL range, and want to assign rDNS to it based on
> the IP,
> 
> 123-45-67-89.dsl.dyn.example.net
> 
> is a lot easier to block via rudimentary mechanisms than
> 
> dsl-dyn-123-45-67-89.example.net
> 

The bulkzone program will easily create right-anchored forward and reverse
zonefiles for any size network block.

http://backpan.cpan.org/authors/id/C/CH/CHRISJ/bulkzone.pl

Just run it twice, and you've got it covered.

On the bigger question of "charging" for reverse DNS: I would consider it
part of the initial setup, or a deferred process tied to the initial setup.
But if a customer swamps you with changes or updates beyond a reasonable
amount, I'd consider delegating the reverse zone, or charging based on the
number of changes.

Just my 2 cents.