comcast ipv6 PTR

Thu Oct 10 01:11:43 UTC 2013

On October 9, 2013 at 11:49 cma at cmadams.net (Chris Adams) wrote:
 > Once upon a time, Robert Webb <rwebb at 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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