DoS "Probing" on one of our hosts

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

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...
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.

Regards,

--ck
--
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