Performance Issues - PTR Records

J nanog at
Wed Nov 2 19:58:59 CDT 2011

PC wrote:
> What happens if the ISP never defines a name server with their RIR for
> their provider-independent address space?  Does ARIN point to somewhere
> which supplies NXDOMAIN?  Just a thought -- I don't have a clue.
> It is entirely possible they have it pointed to their non-existent or
> broken DNS.  Given current best practices, I see no reason not to assign a
> generic DNS across their netblock.

I think that returns SERVFAIL somewhere down the line?

Does it make sense to reinforce the behaviour (good and bad terms left for
another time), while looking forward to v6?

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