[anti-abuse-wg] Reverse DNS delegations

On Fri 05/Apr/2024 14:41:01 +0200 Michele Neylon - Blacknight via anti-abuse-wg wrote:
> Have you asked them to setup PTR records?


I did so for IPv4.  They're unable to delegate but can set PTRs.

For IPv6, they don't have delegation for their own range, so cannot possibly resolve mine.


> We usually do it for our clients, so I’ve no idea how others handle it


Why can't users of a given range set up their own delegation?  I know it should be hierarchical, but in case RIPE did not delegate anything (found SOA 0.a.2.ip6.arpa. dns.ripe.net) couldn't they delegate directly after proof of "ownership"?


Best
Ale



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> Mr Michele Neylon
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> From: anti-abuse-wg <anti-abuse-wg-bounces at ripe.net> on behalf of Alessandro Vesely <vesely at tana.it>
> Date: Friday, 5 April 2024 at 13:01
> To: anti-abuse-wg <anti-abuse-wg at ripe.net>
> Subject: [anti-abuse-wg] Reverse DNS delegations
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> 
> Hi all,
> 
> what's the policy for reverse delegation?  My provider assigned me a 2a02:29e1:500:6c00::/56.  Great.  However they didn't delegate reverse DNS.  Indeed, their own 2a02:29e1::/32 has no delegations:
> 
> ; <<>> DiG 9.18.24-1-Debian <<>> 1.e.9.2.2.0.a.2.ip6.arpa ns
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 19800
> ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
> 
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 1232
> ; COOKIE: cad8ae482b0e559c01000000660fe49763aa815e05fda159 (good)
> ;; QUESTION SECTION:
> ;1.e.9.2.2.0.a.2.ip6.arpa.      IN      NS
> 
> ;; AUTHORITY SECTION:
> 0.a.2.ip6.arpa.         3600    IN      SOA     pri.authdns.ripe.net. dns.ripe.net. 1712314758 3600 600 864000 3600
> 
> 
> Now there are mail servers which reject mail if they don't find a matching PTR:
> 
>    <<< 554 resimta-c2p-559421.sys.comcast.net resimta-c2p-559421.sys.comcast.net 2a02:29e1:500:6c00::4 Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: https://postmaster.comcast.net/smtp-error-codes.php#554
> 
> 
> Why isn't it possible to gain a delegation by proving number assignment?
> 
> 
> Best
> Ale
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