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Re: DNS deluge for x.p.ctrc.cc
From: "Christopher L. Morrow" <christopher.morrow () verizonbusiness com>
Date: Sun, 26 Feb 2006 21:04:15 +0000 (GMT)



On Sun, 26 Feb 2006, Joe Abley wrote:
As a temporary mitigation tool today, when the volume of legitimate,
large-packet EDNS0 traffic is near-zero, blocking big 53/udp packets
might *sound* reasonable. However, we all know how permanent

how are you certain that the udp/53 1500 byte packet is 'dns'? and not
kazaa/gnutella/bittorrent/vpn-in-udp-53 ? It seems that filtering the
TRAFFIC is short sighted on several fronts :( deciding if you will/won't
be part of the global-recursive-dns-server 'problem' is entirely different
though.

temporary filters can be. Crippling EDNS0 transport in the future
seems like a very high price to pay for what might be a very
temporary, short-term reduction in attack traffic.


seems like global tcp/139|tcp/445 filters, or bogon filters... bits put
into configs 'now' and completely forgotten about 'tomorrow' :(


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