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Open Resolver Dataset Update

On 7/04/2013 19:46, Jared Mauch wrote:
> I've continued to update my dataset originally posted about two weeks ago.  Please take a moment and review your CIDRs which may be running an open resolver.
> I've exposed one additional bit in the user-interface that may be helpful.  Some DNS servers will respond with RCODE=0 (OK) but not provide recursion.  nearly 90% of the servers in the database provide recursion.
What is the rationale behind listing servers not providing recursion on 
a list of open resolvers?

As far as I know, responding either NOERROR or REFUSED produces packets 
of the same size.