[78299] in North American Network Operators' Group
RE: SMTP Port Blocking: Success or Failure?
daemon@ATHENA.MIT.EDU (Paul Ryan)
Mon Feb 28 16:27:50 2005
From: "Paul Ryan" <pryan@rogers.wave.ca>
To: "John Levine" <johnl@iecc.com>, <nanog@nanog.org>
Cc: <kfroyn@gnr.com>
Date: Mon, 28 Feb 2005 16:27:16 -0500
In-Reply-To: <20050227161952.11811.qmail@xuxa.iecc.com>
Errors-To: owner-nanog@merit.edu
How effective is rate limiting - can anyone from Comcast reaply to me
offlist, I would be very intersted in results ...
PR
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
John Levine
Sent: Sunday, February 27, 2005 11:20 AM
To: nanog@nanog.org
Cc: kfroyn@gnr.com
Subject: Re: SMTP Port Blocking: Success or Failure?
>What about rate limiting SMTP traffic rather than blocking it? That
>could allow legitimate use for most private customers, while
>preventing bulk traffic.
Comcast has been doing something like that, looking for spikes of SMTP
connects and blocking when they see them, done at the IP level. I
can't say that I'm overly impressed with how well it's working, but
it's better than nothing.
Regards,
John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for
Dummies",
Information Superhighwayman wanna-be, http://www.johnlevine.com, Mayor
"I dropped the toothpaste", said Tom, crestfallenly.
