[166160] in North American Network Operators' Group
Re: comcast ipv6 PTR
daemon@ATHENA.MIT.EDU (John Levine)
Wed Oct 9 22:03:41 2013
Date: 10 Oct 2013 02:01:27 -0000
From: "John Levine" <johnl@iecc.com>
To: nanog@nanog.org
In-Reply-To: <93D9A8E3-A7D0-40EE-AAA9-3207A5D14E90@hopcount.ca>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
>If people really want to use generic reverse names and have realised
>that the v6 address space is much too big for $GENERATE, one approach is
>to delegate the appropriate zones to a custom nameserver that can
>auto-generate PTRs on demand. There are scaling problems here, but
>probably nothing that can't be fixed with high TTLs and multiple
>nameservers.
In my discussions with people at some big ISPs, I got the impression
that they could do that, but it wouldn't provide any more useful
information than no rDNS at all, so they don't. I'm on T-W cable,
and there's no way for me to set rDNS. It'd be more trouble than
it's worth, since my /64 changes every time the modem reboots
which seems to be about once a month.
Real servers on static addresses are different, of course. My servers
are on an HE tunnel, and all have matching forward and reverse DNS.
R's,
John
