Are we really this helpless? (Re: isprime DOS in progress)
danny at tcb.net
Fri Jan 23 22:53:32 CST 2009
On Jan 23, 2009, at 9:10 PM, Christopher Morrow wrote:
> On Fri, Jan 23, 2009 at 10:31 PM, <Valdis.Kletnieks at vt.edu> wrote:
>> On Fri, 23 Jan 2009 18:33:14 PST, Seth Mattinen said:
>>> Back to my original question: is there really not a better solution?
>> Well, we *could* hunt down the perpetrators, pool some $$, and hire
>> 3 or 4
>> baseball-bat wielding professional explainers to go explain our
>> position to
>> them. Figuring out how to do so without breaking any laws is the
>> tough part...
> Step one, find a device on your netowrk seeing the traffic
> step two, follow the stream(s) of traffic back to its ingress
> (hopefully a customer link on your network)
> step three, watch for associated traffic to the source of the dns
> queries, correlate this with other sources on your network to
> find/identify the control point for this effort.
You missed one.. Step 4: enable BCP 38 or similar
ingress source address spoofing mitigation mechanism
on all customer ingress interfaces (note: uRPF *loose*
mode no-fixie these attacks) - as you should have had
in the first place such that you didn't have to trace
those spoof packets step-by-step back through your
No more excuses, people..
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