Performance Issues - PTR Records

Tom Lanyon tom+nanog at
Sun Nov 6 20:51:29 CST 2011

On 07/11/2011, at 12:46 PM, Robert Bonomi wrote:
>> 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: 
>   cust.{accountid}.{locationid}.ISP.{com/net/TLD}
> or something of the sort.
> Something of that sort can save a -lot- of time/effort in identifying the
> customer involved in a complaint.

Surely that's only useful if they're still allocated the address at the time of investigating said complaint;  a dynamically updating DNS record like this is really no substitution for accurate accounting records in your RADIUS system.


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