IPv6 automatic reverse DNS

Wesley George wesgeorge at puck.nether.net
Sat Oct 29 02:08:24 UTC 2016


I'd recommend reviewing this document, and contributing as appropriate. I think it covers this pretty thoroughly today, but if there are missing considerations, now is the time to make sure that feedback is captured.
 https://tools.ietf.org/html/draft-ietf-dnsop-isp-ip6rdns-02 <https://tools.ietf.org/html/draft-ietf-dnsop-isp-ip6rdns-02>

Wes George


> On Oct 28, 2016, at 7:02 PM, Baldur Norddahl <baldur.norddahl at gmail.com> wrote:
> 
> Hello
> 
> Many service providers have IPv4 reverse DNS for all their IP addresses. If nothing is more relevant, this will often just be the IPv4 address hashed somehow and tagged to the ISP domain name. For some arcane reason it is important to have the forward DNS match the reverse DNS or some mail servers might reject your mails.
> 
> However with IPv6 it is not practical to build such a complete reverse DNS zone. You could do a star entry but that would fail the reverse/forward match test.
> 
> 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?
> 
> I know of some arguments for:
> 
> 1a) mail servers like it
> 
> 1b) anti spam filters believe in the magic of checking forward/reverse match.
> 
> 2) traceroute will be nicer
> 
> 3) http://ipv6-test.com/ will give me 20/20 instead of 19/20 (yes that was what got me going on this post)
> 
> 4) Output from "who" command on Unix will look nicer (maybe).
> 
> Regards,
> 
> Baldur

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