comcast ipv6 PTR

Wed Oct 9 16:59:59 UTC 2013

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 10/9/2013 9:49 AM, 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.
 >

That's not necessarily true -- some (very large) organizations using DMARC
will reject mail from hosts without a PTR record.

- - ferg

-----BEGIN PGP SIGNATURE-----
Version: PGP Desktop 10.2.0 (Build 2317)
Charset: utf-8

wj8DBQFSVYuKq1pz9mNUZTMRAo5dAKCCuFYjseatheC9upjRRgkzcFJ5LwCfUhhd
Krgz0IA6e5dbllo8NgXbzV0=
=mehI
-----END PGP SIGNATURE-----

-- 
Paul Ferguson
Vice President, Threat Intelligence
Internet Identity, Tacoma, Washington  USA
IID --> "Connect and Collaborate" --> www.internetidentity.com