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Re: DOS Attacks and reliable network contact data.
From: Basil Kruglov <basil () cifnet com>
Date: Sat, 21 Oct 2000 18:04:53 -0500


On Sat, Oct 21, 2000 at 05:14:53PM -0400, Jason Slagle wrote:

21259901:21259901(0) ack 1412091198 win 2144 <mss 536>
22:30:52.822459 255.255.255.255.80 > 205.133.127.30.6667: R 0:0(0) ack
2473479669 win 0
22:30:52.822711 210.251.128.255.80 > 205.133.127.30.6667: R 0:0(0) ack
529389642 win 0
22:30:52.822962 195.53.123.0.80 > 205.133.127.30.6667: . ack 1625272127
win 9112 (DF)
22:30:52.823213 152.158.37.127.80 > 205.133.127.30.6667: R 0:0(0) ack
1362286194 win 0

We do get this sort of crap daily at least 5 times a day, distributed
tcp/ack, tcp/syn, etc, over 40-50Kpps+ sometimes.. my list of over ~230
slave networks (in /24 format). Kids are after taking CPUs in routers
out and not killing you with hundrends and hundreeds of Mbps, 
high-pps attacks are also very nasty, and of course everything 
is over some stupid IRC issue.

Their exists no reliable way to get the contact of a network without first
querying arin, then apnic, then the .jp registry for instance.  This is a
royal PITA and is in no way scriptable that I can see.

What is neat is all those 'slaves' are spoofing inside their own /24
or whatever allocation they sit in, and it's very hard to persuade somebody
to look into this as they claim those ip addresses are not in use or
have only routers/switches and there is no way those devices could've 
generated a [d]DoS attack.

--
Basil Kruglov [BK252-ARIN]
Network Engineering and Security
CIFNet, Inc.



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