Re: DoS "Probing" on one of our hosts

[Christopher Kunz <chrislist () de-punkt de>]

Edward Balas wrote:
> Depends on the nature of the attack, from what I have seen this is not
> uncommen.  Ive seen this type agaist IRC servers quite often.

Yeah, that is pretty usual - you want a server, specifically a node
server, to lose its link with the other servers to "split" the network
and be able to splitride your way into becoming op in your target
channel(s). We don't run IRC services, however.

> If you have access to the netflow accounting data for the routers, then
> you can backtrace the traffic to the incomming network.  Or if you dont, 
> your ISP may.  They probably wont be interesting in helping backtrack 
> this given the short duration.

I second. They seem to be used to real attacks going over days (to take
down one of the many shell providers housed in the same data center) and
don't take action for short spikes. They would, however, have filtered
the source IPs on their border routers, but that's no good if you either
don't know the source or have to suspect it is spoofed.

--ck
--
php development | hosting |  housing | professional game server hosting
http://www.de-punkt.de   [ chris () de-punkt de ]    http://www.stormix.de
+49 511 1237504 | +49 511 1237505 | laportestr. 2a, 30449 hannover.de
Filoo auf dem Linuxtag 2003 (F15) - http://www.de-punkt.de/lt2003.php




----------------------------------------------------------------------------
Attend the Black Hat Briefings & Training, July 28 - 31 in Las Vegas, the 
world's premier technical IT security event! 10 tracks, 15 training sessions, 
1,800 delegates from 30 nations including all of the top experts, from CSO's to 
"underground" security specialists.  See for yourself what the buzz is about!  
Early-bird registration ends July 3.  This event will sell out. www.blackhat.com
----------------------------------------------------------------------------