[118573] in North American Network Operators' Group
Re: ISP port blocking practice
daemon@ATHENA.MIT.EDU (Dan White)
Fri Oct 23 18:16:01 2009
Date: Fri, 23 Oct 2009 17:15:45 -0500
From: Dan White <dwhite@olp.net>
To: "James R. Cutler" <james.cutler@consultant.com>
In-Reply-To: <0B69C279-1DFF-4005-9D7F-6F2EA207363D@consultant.com>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 23/10/09 17:58 -0400, James R. Cutler wrote:
> Blocking the well known port 25 does not block sending of mail. Or the
> message content.
It does block incoming SMTP traffic on that well known port.
> I think the relevant neutrality principle is that traffic is not blocked
> by content.
My personal definition doesn't quite gel with that. You're deciding for the
customer how they can use their connection, before you have any evidence of
nefarious activity.
Would you consider restricting a customer's outgoing port 25 traffic to a
specific mail server a step over the net neutrality line?
--
Dan White
