Re: comcast ipv6 PTR

[Barry Shein <bzs () world std com>]

On October 9, 2013 at 11:49 cma () cmadams net (Chris Adams) wrote:
> Once upon a time, Robert Webb <rwebb () ropeguru com> said:
> > But how would thet differ from the IPv4 address space which has PTR
> > records for all their IP's? Just the shear number they would have to
> > deal with in the IPv6 space?
>
> Oh, are you looking for auto-generated reverse for every address?
> That's not going to happen for IPv6 (and it turns out that it wasn't
> really a good idea for IPv4).  There's no reason to have reverse DNS
> unless it has meaning, and "12-34-56-78.rev.domain.net" isn't really all
> that useful.

It's very useful for blocking spammers and other miscreants -- no
reason at all to accept SMTP connections from troublesome
*.rev.domain.net at all, no matter what the preceding NNN-NNN-NNN-NNN
is.

Perhaps not their problem, but it is useful!

-- 
        -Barry Shein

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