Re: IPv6 automatic reverse DNS

[Luke Guillory <lguillory () reservetele com>]

Why not have DHCP update dns with both.

Sent from my iPad

>

Luke Guillory
Network Operations Manager

Tel:    985.536.1212
Fax:    985.536.0300
Email:  lguillory () reservetele com

Reserve Telecommunications
100 RTC Dr
Reserve, LA 70084

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On Oct 28, 2016, at 6:04 PM, Baldur Norddahl <baldur.norddahl () 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