North American Network Operators Group

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Re: DDos syn attack

  • From: Randy Bush
  • Date: Mon Dec 30 11:11:38 2002

> This is also a very viable solution, provided the customer has
> provisioned for this with lower ttls on their DNS records, which
> ALOT of people (thankfully) don't do

actually, a bunch of research now shows that low ttls on A RRs
(that are not the A RRs of NS RRs) has little effect.

in the case a dns lookup is being done in a ddos, of course one
would prefer if the attacking zombies cached the lookup <grin>.