nanog mailing list archives
Re: comcast ipv6 PTR
From: Chris Adams <cma () cmadams net>
Date: Wed, 9 Oct 2013 20:18:17 -0500
Once upon a time, Barry Shein <bzs () world std com> said:
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.
If you are going to block like that, just block anybody without valid reverse DNS. If you don't trust provider foo.net to police their users, why trust them to put valid and consistent xx-xx-xx-xx.dyn.foo.net reverse? I only see a use for reverse DNS for router interfaces (for useful traceroute info) and servers (and only really SMTP servers). Most of the rest is fluff, often out-of-date, uselessly auto-generated, etc. -- Chris Adams <cma () cmadams net>
Current thread:
- Re: comcast ipv6 PTR, (continued)
- Re: comcast ipv6 PTR Robert Webb (Oct 09)
- Re: comcast ipv6 PTR Chris Adams (Oct 09)
- Re: comcast ipv6 PTR Paul Ferguson (Oct 09)
- Re: comcast ipv6 PTR Chris Adams (Oct 09)
- Re: comcast ipv6 PTR Livingood, Jason (Oct 09)
- Re: comcast ipv6 PTR Blair Trosper (Oct 09)
- Re: comcast ipv6 PTR Chris Adams (Oct 09)
- Re: comcast ipv6 PTR Joe Abley (Oct 09)
- Re: comcast ipv6 PTR John Levine (Oct 09)
- Re: comcast ipv6 PTR Robert Webb (Oct 09)
- Re: comcast ipv6 PTR Barry Shein (Oct 09)
- Re: comcast ipv6 PTR Chris Adams (Oct 09)
- Re: comcast ipv6 PTR Barry Shein (Oct 09)
- Re: comcast ipv6 PTR Lee Howard (Oct 14)
- Re: comcast ipv6 PTR Barry Shein (Oct 14)
- Re: comcast ipv6 PTR Franck Martin (Oct 14)
- Re: comcast ipv6 PTR Paul Ferguson (Oct 14)
- Re: comcast ipv6 PTR Barry Shein (Oct 14)
- Re: comcast ipv6 PTR John Levine (Oct 14)
- Re: comcast ipv6 PTR Blair Trosper (Oct 14)
- Re: comcast ipv6 PTR Chris Adams (Oct 15)
- Re: comcast ipv6 PTR Brielle Bruns (Oct 15)