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DNS DoS ???



On Aug 1, 2011, at 7:42 AM, Mark Andrews wrote:

> Named already takes proper precautions by default.  Recursive service is limited to directly connected networks by default.  The default
> was first changed in 9.4 (2007) which is about to go end-of-life once the final wrap up release is done.

This alone isn't enough.  There are quite a few other things folks must do from an architectural and operational standpoint which aren't found in named.conf.

> The real problem is that many ISP's don't do effective ingress/egress filtering.

Well, no.  The real problem is a protocol set/implementation which lends itself so readily to spoofing in the first place, followed (as you say) by ISP/endpoint network inattention to anti-spoofing, followed by protocols which make use of the eminently-spoofable UDP for a critical service.

>  This prevents compromised machines impersonating other machines.

Concur, but see above - spoofing is the symptom, not the disease.

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Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

		The basis of optimism is sheer terror.

			  -- Oscar Wilde