RE: [Full-disclosure] Re: recursive DNS servers DDoS as a growing DDoSproblem
- From: "Geo." <geoincidents@xxxxxxx>
- Date: Wed, 8 Mar 2006 13:27:18 -0500
In the scenario you describe, I cannot see any actual amplification...
I'll give you a senario where you can see.
lets say you have 2 name servers that are local to you.
I setup a domain, example.com. In this domain I create a text record which is 100K in length, I don't know, perhaps I paste the source code to decss in it, whatever it's a big text record.
Now I simply spoof a UDP packet using your IP address as the source address and send it to both of your dns servers. This packet is a query for the example.com text record. I have now sent two very small packets and you have received 200K of traffic. That's the amplification, one small udp packet, one large text record in return.
Note, I don't have to use your local servers, but this way it makes it more fun to troubleshoot because it looks like you are the cause of your own flooding..
Geo.
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