UDP Flooding

June 25, 2009 at 17:57:35
Specs: WinXP MCE, Celeron 1.7GHz/384Mb
I noticed on my wireless router's security log that a UDP Flood took place last week. I have only learned today a little bit about what that means. I wonder if I can get some advice from some of the more experienced networkers on here. My home network is a cable modem into a wireless router. A desktop is cabled to the router and another desktop and laptop are wirelessly linked. Does the UDP flood come from someone trying to "hack in" to my network or computer, or is it something that comes from online? I just want to get an idea of how serious this is and what someone's intention could be. Thanks for any help you can give, as I know next to nothing on this topic.


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June 26, 2009 at 20:24:29
UDP flood attacks are pretty harmless to a home user. Where they can cause problems is if they are effectivly carried out on a corporate network or a public website. In your case you can probably just ignore (that is assuming your firewall blocked the packets?).

You can do a reverse IP lookup to see where the packets were sent from, but any attacker worth a grain of salt will spoofs his/her address. Also if they did not spoof they themselves would be flooded with destination unreachable responses.

If this happens again you can configure your router (depending on router type) to not respond with the ICMP Destination Unreachable packet. Generating this response causes a drag on your router and lets the attacker know that you are 'home' and activly working to block his attack.

Good luck,

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