[166154] in North American Network Operators' Group
Re: comcast ipv6 PTR
daemon@ATHENA.MIT.EDU (Barry Shein)
Wed Oct 9 21:12:13 2013
From: Barry Shein <bzs@world.std.com>
Date: Wed, 9 Oct 2013 21:11:43 -0400
To: Chris Adams <cma@cmadams.net>
In-Reply-To: <20131009164947.GI1193@cmadams.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On October 9, 2013 at 11:49 cma@cmadams.net (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.
It's very useful for blocking spammers and other miscreants -- no
reason at all to accept SMTP connections from troublesome
*.rev.domain.net at all, no matter what the preceding NNN-NNN-NNN-NNN
is.
Perhaps not their problem, but it is useful!
--
-Barry Shein
The World | bzs@TheWorld.com | http://www.TheWorld.com
Purveyors to the Trade | Voice: 800-THE-WRLD | Dial-Up: US, PR, Canada
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