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| Subject: | Re: DoS attack... what to do? |
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| Date: | Tue, 4 Jan 2005 19:19:06 -0500 (EST) |
On Tue, 4 Jan 2005, Bernie Cosell wrote:
How do you do this? If the packets coming in have forged source-IP addresses, how do you trace them backwards?
backtrace via the input and output intreface IDs from the devices the traffic traverses. if you have well formed characteristic (ie SYN packets destined to a particular dest and dport) you can trace it that way. follow it back as far as you can go and, if it crosses operational boundaries, get some cooperation (in the case of very large events). cisco does this, arbor does this, etc ... ________ jose nazario, ph.d. jose@monkey.org http://monkey.org/~jose/ http://infosecdaily.net/
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