Performance Issues - PTR Records

Thu Nov 3 00:58:59 UTC 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 x.x.x.x-dynamic.customer.isp.com 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?