RE: port scanning from spoofed addresses

[Matthew Huff <mhuff () ox com>]

The source address appears to be fixed as well as the source port (6666), scanning different destinations and ports.

----
Matthew Huff       | One Manhattanville Rd
OTA Management LLC | Purchase, NY 10577
http://www.ox.com  | Phone: 914-460-4039
aim: matthewbhuff  | Fax:   914-460-4139


-----Original Message-----
From: Florian Weimer [mailto:fweimer () bfk de] 
Sent: Thursday, December 03, 2009 12:35 PM
To: Matthew Huff
Cc: (nanog () nanog org)
Subject: Re: port scanning from spoofed addresses

* Matthew Huff:

> We are seeing a large number of tcp connection attempts to ports
> known to have security issues. The source addresses are spoofed from
> our address range. They are easy to block at our border router
> obviously, but the number and volume is a bit worrisome. Our
> upstream providers appear to be uninterested in tracing or blocking
> them. Is this the new normal? One of my concerns is that if others
> are seeing probe attempts, they will see them from these addresses
> and of course, contact us.

What's the distribution of the source addresses and source ports?

-- 
Florian Weimer                <fweimer () bfk de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99