[166145] in North American Network Operators' Group
Re: comcast ipv6 PTR
daemon@ATHENA.MIT.EDU (Cutler James R)
Wed Oct 9 14:14:20 2013
From: Cutler James R <james.cutler@consultant.com>
In-Reply-To: <CAA5Ek4fVhjzjLTAFovc4gopOqPuSO8twc-dVwPf7WXZzAgvrmg@mail.gmail.com>
Date: Wed, 9 Oct 2013 14:08:32 -0400
To: Blair Trosper <blair.trosper@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Oct 9, 2013, at 12:35 PM, Blair Trosper <blair.trosper@gmail.com> =
wrote:
> Does anyone know why (or can someone from Comcast explain why) there =
is no
> PTR on their residential/business IPv6 addresses?
Which IPv6 addresses:
=20
1 delegated WAN address?
2 end systems on delegated LAN prefix or with static assignments?
In my experience with Comcast Business Internet:
=20
1 the delegated WAN address does have an (almost useless) PTR record =
which is essentially the AAAA spelled backward.
2 PTR records for automatically configured end systems on a local LAN =
are a local responsibility. Static IP assignments may come with PTR =
entries, depending on business arrangements.
Since neither Comcast or any other DNS provider has any direct knowledge =
of your local network configuration, you cannot expect to see any PTR =
DNS records for local systems unless you make some business (and =
technical) arrangements with a DNS provider.
If you really need PTR record for your local SMTP servers, arrange for =
them with your DNS provider, even if that provider is you.
James R. Cutler
james.cutler@consultant.com
