[78286] in North American Network Operators' Group
Re: SMTP Port Blocking: Success or Failure?
daemon@ATHENA.MIT.EDU (John Levine)
Sun Feb 27 11:20:17 2005
Date: 27 Feb 2005 16:19:52 -0000
From: John Levine <johnl@iecc.com>
To: nanog@nanog.org
In-Reply-To: <1109510272.4221c88102e9c@mail.gnr.com>
Cc: kfroyn@gnr.com
Errors-To: owner-nanog@merit.edu
>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.
