DNS deluge for x.p.ctrc.cc

Steven M. Bellovin smb at cs.columbia.edu
Sat Feb 25 14:00:17 UTC 2006

In message <Pine.GSO.4.62.0602241629470.21514 at qentba.nf23028.arg>, Rob Thomas w

>Limit UDP queries to 512 bytes.  This greatly decreases the
>amplification affect, though it doesn't stop it.

Unfortunately, the intention of the DNS developers is just the 
opposite.  Things like DNSSEC require larger packet sizes; in fact, 
there's a DNS extension  (EDNS0) whose purpose, among others, it to 
permit this.  

		--Steven M. Bellovin, http://www.cs.columbia.edu/~smb

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