Performance Issues - PTR Records

Robert Bonomi bonomi at
Sun Nov 6 20:16:39 CST 2011

> From at  Sun Nov  6 19:58:58 2011
> Date: Sun, 6 Nov 2011 19:57:51 -0600
> Subject: Re: Performance Issues - PTR Records
> From: Jimmy Hess <mysidia at>
> To: Mark Andrews <marka at>
> Cc: nanog at
> On Sun, Nov 6, 2011 at 7:10 PM, Mark Andrews <marka at> wrote:
> > MacOS and Windows can both populate the reverse zone for you as can
> > dhcp servers.
> > The practice of filling out the reverse zone with fake PTR record  [...]
> OK.. let's say you're a DSL provider.   Are you going to have your
> DHCP server populating the forward and reverse DNS?   With what,  the
> account holder's  name? ?

I'll suggest that (a) IF the addresses do migrate among different customers
of the ISP, (b) the addresses handed out are publicly routable, AND (c) the
CPE has to 'authenticate' itself to the head-end, then it is _very_ useful 
*to*the*ISP* to have dynamically-assigned DNS records of the form: 
or something of the sort.

Something of that sort can save a -lot- of time/effort in identifying the
customer involved in a complaint.

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