[166131] in North American Network Operators' Group
Re: comcast ipv6 PTR
daemon@ATHENA.MIT.EDU (Paul Ferguson)
Wed Oct 9 13:02:59 2013
Date: Wed, 09 Oct 2013 09:59:59 -0700
From: Paul Ferguson <fergdawgster@mykolab.com>
To: nanog@nanog.org
In-Reply-To: <20131009164947.GI1193@cmadams.net>
Reply-To: fergdawgster@mykolab.com
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On 10/9/2013 9:49 AM, Chris Adams wrote:
> Once upon a time, Robert Webb <rwebb@ropeguru.com> said:
>> But how would thet differ from the IPv4 address space which has PTR
>> records for all their IP's? Just the shear number they would have to
>> deal with in the IPv6 space?
>
> Oh, are you looking for auto-generated reverse for every address?
> That's not going to happen for IPv6 (and it turns out that it wasn't
> really a good idea for IPv4). There's no reason to have reverse DNS
> unless it has meaning, and "12-34-56-78.rev.domain.net" isn't really all
> that useful.
>
That's not necessarily true -- some (very large) organizations using DMARC
will reject mail from hosts without a PTR record.
- - ferg
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--
Paul Ferguson
Vice President, Threat Intelligence
Internet Identity, Tacoma, Washington USA
IID --> "Connect and Collaborate" --> www.internetidentity.com
