IPv6 automatic reverse DNS

Karl Auer kauer at biplane.com.au
Sat Oct 29 01:04:03 UTC 2016


On Sat, 2016-10-29 at 01:02 +0200, Baldur Norddahl wrote:
> It should be simple to build a DNS server that will automatically 
> generate a hostname value for every reverse lookup received, and also
> be able to parse that hostname value to return the correct IPv6
> address on forward lookups.
> 
> Does any DNS server have that feature? Should we have it? Why not?

Nominum's nameserver software has these features. Industrial strength
nameservice, with lots of industrial-strength features, but at an
industrial-strength price.

I thought BIND had grown that feature, but I haven't used BIND for a
while now, so maybe not.

> 1b) anti spam filters believe in the magic of checking
> forward/reverse match.

Someone in this thread said that only malware-infested end-users are
behind IP addresses with no reverse lookup. Well - no. As long as we
keep telling anyone who isn't running a full-bore commercial network to
"consume, be silent, die", we are holding everyone back, including
ourselves.

It's fine to use no-reverse-lookup as a component of a spamminess
score. It's not OK to use it as proof of spamminess.

Regards, K.

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Karl Auer (kauer at biplane.com.au)
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