[dns-operations] Limiting DNSSEC-based amplification attacks (Was: Weird TXT record

[Dobbins, Roland]

On Jun 24, 2011, at 1:59 PM, David Conrad wrote:

> I personally think rate limiting would be an appropriate tool to help reduce the impact of amplification attacks at a relatively low cost.

All this does is ensure the attack-related queries get through, whilst the legitimate ones are crowded out, unfortunately.

>  Is it the ultimate solution?  Obviously not.  What alternatives are there?


As noted previous - query/answer analysis in order to determine what's being hammered, and then appropriate query-filtering action, and/or S/RTBH, and/or flowspec, and/or IDMS.

That's pretty much it, AFAIK.


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Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

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