[77011] in North American Network Operators' Group
Re: New and interesting network abuse.
daemon@ATHENA.MIT.EDU (Suresh Ramasubramanian)
Tue Jan 11 02:43:08 2005
Date: Tue, 11 Jan 2005 13:12:40 +0530
From: Suresh Ramasubramanian <ops.lists@gmail.com>
Reply-To: Suresh Ramasubramanian <ops.lists@gmail.com>
To: Ejay Hire <ejay.hire@isdn.net>
Cc: nanog@nanog.org
In-Reply-To: <F19526C0E4A5124EB204C94489F6978B015B43B4@bnaw2kmsx01.BNA01.ISDN.NET>
Errors-To: owner-nanog-outgoing@merit.edu
Thread that I just started yesterday about port 25 blocking and if
more ISPs werent doing this bidirectionally.
Which is what your local ISP, and other ISPs that have dialup pools, must do.
--srs
On Tue, 11 Jan 2005 01:33:00 -0600, Ejay Hire <ejay.hire@isdn.net> wrote:
>
> My apologies if this strays off topic, but I wanted to share my recent
> experience.
>
> We had a collocation customer come in and request a t1 of pots lines for
> their servers, then complaints that their "security" software wasn't
> working because of our RPF checks. As it turns out they were dialing up
> to a local isp, and sending bulk email using our bandwidth, but the
> dial-up's ip.... And receiving the TCP ack on the dial up.
