Denial of Service

[Barry Margolin]

In article <ernk1c$1tcf$1 at sf1.isc.org>,
 "Nick Allum" <Nick.Allum at rci.rogers.com> wrote:

> Just had a quick question, at the Bind Level, if there was a possible
> Denial of Service coming from only a handful of ip address, would I be
> able just to use an ACL to deny these or will my servers still be
> flooded as it has to process the ACL?
> Of what would be the quickest and easiest way to reduce the effect of
> some type of Denial of Service where I am getting large quantaties of
> requests from the same group of IPS.

As others have pointed out, it would be better to filter them upstream.  
Next best might be your OS's packet filtering.  But filtering in BIND 
would be better than nothing, since it takes less work to check an 
against a filter than to actually perform the DNS processing, so the 
backlog will be smaller.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
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