Re: comcast ipv6 PTR

[Blair Trosper <blair.trosper () gmail com>]

That's essentially what I'm getting at.  If the v6 addresses/blocks are
allocated in a similar fashion to IPv4, where the octets are clearly named
by state and "hsd1", then I don't see why they should lack PTR.

However, even if they're not assigned or delegated in that way, it'd be
helpful to have SOME form of PTR on there.

Otherwise, they'd be a lot like Google, leaving the traceroute and
end-point PTR left up to our imagination (even though it's available
internally to Google employees).  I understand why Google lacks PTR to some
extent with anycast and the mobility of their v4 addresses, but I suspect
that Comcast isn't doing anything that sophisticated.


On Wed, Oct 9, 2013 at 11:47 AM, Robert Webb <rwebb () ropeguru com> wrote:

> On Wed, 9 Oct 2013 11:41:50 -0500
>  Chris Adams <cma () cmadams net> wrote:
>
> > Once upon a time, Blair Trosper <blair.trosper () gmail com> said:
> >
> > > Does anyone know why (or can someone from Comcast explain why) there is
> > > no
> > > PTR on their residential/business IPv6 addresses?
> >
> > I believe business customers (with a static assignment) can request
> > reverse DNS entries.  Residential customers are not guaranteed a static
> > assignment, so they can't get reverse set.
> >
> > --
> > Chris Adams <cma () cmadams net>
> 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?
>
> Robert