nanog mailing list archives

Re: Reverse DNS for eyeballs?


From: heasley <heas () shrubbery net>
Date: Fri, 21 Apr 2023 15:31:12 +0000

Fri, Apr 21, 2023 at 07:37:49AM -0500, Chris Adams:
Once upon a time, Forrest Christian (List Account) <lists () packetflux com> said:
I have a feeling that I might be stepping into a can of worms by asking
this,  but..

What's the current thinking around reverse DNS on IPs used by typical
residential/ small business customers.

I don't see any benefit to programmatically-generated reverse DNS.  I
stopped setting it up a long time ago now.  Really, reverse DNS these
days is mostly only useful for:

- mail servers (where it shows a modicum of control and clue)
- infrastructure/router IPs (so mtr/traceroute can show useful info)

I view complete DNS coverage to be a basic function.  All used addresses
should have forward and matching reverse records.  This is not difficult
stuff.  Bonus points for including a clli code or similar indicating the
general location of use for uses like network device interfaces, commodity
end-users, etc; also not difficult stuff.

You are tracking your allocations, right?  Programmatically generating
your device configurations?  So, generate DNS from that same database(s).


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