On Sun, 29 Jun 2003, Christopher Kunz wrote: > Hey, > > we have been encountering three short DoS attacks during the weekend - > each one around 1 hour in length and with about 100mbit worth of > bandwidth. So far, we've yet to determine even the most basic stuff, > since we don't seem to have any logging. I have two questions regarding > this: > 1. isn't one hour a pretty short time for a DoS? I've seen attacks on > other nets lasting for hours, sometimes up to a day... 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. > 2. is there any tool to determine the source IPs of the attack (even if > they're spoofed, I'd like to see _anything_)? Snort sits on the attacked > host and happily reports SQL/Slammer and other trivial stuff, but goes > through one of the attacks without picking any signatures up. > 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. Edward Balas > Regards, > > --ck > ---------------------------------------------------------------------------- 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 ----------------------------------------------------------------------------
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