Re: [DNSOP] I-D Action: draft-ietf-dnsop-isp-ip6rdns-03.txt

"John R Levine" <johnl@taugh.com> Thu, 11 May 2017 17:38 UTC

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Date: 11 May 2017 13:33:40 -0400
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From: "John R Levine" <johnl@taugh.com>
To: "Paul Vixie" <paul@redbarn.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/JdgzlQxXRVj3MZsVmzQLxkq2f10>
Subject: Re: [DNSOP] I-D Action: draft-ietf-dnsop-isp-ip6rdns-03.txt
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>> What would be the operational advantage of accepting mail from IPv6 hosts
>> too lame to set up rDNS?
>
> we will never know, because every v6 end system will have a ptr, either 
> naturally, or machine-generated for it, because v6 providers will not 
> want their rank-and-file v6 endsystems to be excluded from important 
> activities such as transmitting e-mail.

You might want to talk to large providers that do v6 now.  With only one 
exception I can think of, they have no plans to do synthesized v6 rDNS, 
and they routinely block port 25 from all their consumer networks.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly