North American Network Operators Group
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Re: DNS deluge for x.p.ctrc.cc
- From: Steven M. Bellovin
- Date: Sat Feb 25 09:08:36 2006
In message <Pine.GSO.4.62.0602241629470.21514@qentba.nf23028.arg>, Rob Thomas w
rites:
>
>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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