Re: Performance Issues - PTR Records

[Tom Lanyon <tom+nanog () oneshoeco com>]

On 05/11/2011, at 1:14 PM, Paul Ebersman wrote:
> tim> If PTR exists in zone file, serve it.  Else, synthesize generic
> tim> reverse.  Jobsagoodun.
>
> If all we're doing is lying with some generic answer that we hack our
> server to produce, why are we bothering?

Because some applications rely on it working (for some definition of "working").

> My contention is that (at least for end hosts), PTR records are mostly
> pointless and just overhead for DNS servers.

If you haven't set up PTR records for your end hosts, realistically you're going to be serving NXDOMAINs for them 
anyway, so there's not really any overhead introduced by supplying something generic instead...

Tom