[166231] in North American Network Operators' Group
Re: comcast ipv6 PTR
daemon@ATHENA.MIT.EDU (Paul Ferguson)
Mon Oct 14 21:37:46 2013
Date: Mon, 14 Oct 2013 18:36:53 -0700
From: Paul Ferguson <fergdawgster@mykolab.com>
To: Franck Martin <fmartin@linkedin.com>
In-Reply-To: <77426B543150464AA3F30DF1A91365DE6AB22CFF@ESV4-MBX02.linkedin.biz>
Cc: "<nanog@nanog.org>" <nanog@nanog.org>
Reply-To: fergdawgster@mykolab.com
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On 10/14/2013 6:23 PM, Franck Martin wrote:
> If you want to block spam on IPv6, then you can start by rejecting
> connections to SMTP from any IPv6 that do not have a PTR. No need to
> analyze the format of the PTR.
>
> It is in several recommendations that a sending email IP must have a PTR.
>
> That ISPs will not do a PTR on all IPv6 but only on static IPv6, improves
> the spam blocking feature above. No need to maintain list of dynamic IP
> space...
>
...and Franck would know -- he rejects all mail from MTAs which do not. :-)
- - ferg
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--
Paul Ferguson
Vice President, Threat Intelligence
Internet Identity, Tacoma, Washington USA
IID --> "Connect and Collaborate" --> www.internetidentity.com
