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Author Topic: Help! I need something sane on rDNS  (Read 1533 times)

n4rky

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Help! I need something sane on rDNS
« on: August 26, 2014, 06:25:04 PM »

Hello all,

Sorry, but nothing I'm seeing on how to do IPv6 rDNS even remotely begins to make sense to me. I realize this is supposed to be simpler than the old IPv4, but it just looks even weirder than the old IPv4, which was plenty weird enough. And the length that I take it will be required isn't adding to my sense of sanity.

I have a /64 tunnel from he.net: 2001:470:67:119::/64. I have roughly 13 addresses I'm trying to set up reverse for. I have no understanding of what the zone name should look like from anything I'm seeing on the web or on these forums. I have no understanding of the relevant zone files.

Can somebody point me at something sane that will actually make sense?

Thanks!
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broquea

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Re: Help! I need something sane on rDNS
« Reply #1 on: August 26, 2014, 06:44:57 PM »

Still uses PTR records, not certain what the issue is....guess it depends on what DNS software you are using?

Your SOA/$ORIGIN should be your 64 network bits, so 9.1.1.0.7.6.0.0.0.7.4.0.1.0.0.2.ip6.arpa

Then the PTR is the the host 64 bits sooooooo:

1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR whatever.some.tld

edit - also try this: http://www.gestioip.net/docu/ipv6_reverse_dns_delegation.html
« Last Edit: August 26, 2014, 06:53:21 PM by broquea »
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n4rky

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Re: Help! I need something sane on rDNS
« Reply #2 on: August 27, 2014, 02:39:32 AM »

There is also a tool called sipcalc that with the -r option will show what the entire name is supposed to look like.

I've got it sorted out now--thanks!--but I really wish Dan Bernstein's approach with djbdns had caught on. dbjdns would just figure out the PTR response from the A record and, of course, this could be extended to AAAA records.
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snarked

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Re: Help! I need something sane on rDNS
« Reply #3 on: August 27, 2014, 10:47:31 AM »

Re:  http://www.gestioip.net/docu/ipv6_reverse_dns_delegation.html

The guy who wrote that doesn't realize that 4-bit groups are properly called nybbles.  I would be hesitant to refer someone to a resource that can't even spell an integral part of the process correctly, but perhaps that's just me.  ;-)
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