[Dnsmasq-discuss] DNSMasq and DNS reflection attacks

Kevin Darbyshire-Bryant kevin at darbyshire-bryant.me.uk
Thu Oct 24 17:29:13 BST 2013

On 24/10/2013 17:03, Brian Rak wrote:
> We've recently undertaken a project to clean up our network, and lock
> down all the open DNS resolvers.  As you may know, these are very
> frequently used for DDOS attacks: http://openresolverproject.org/ ,
> http://www.team-cymru.org/Services/Resolvers/ .
> I haven't been able to find any sort of configuration option that
> would prevent DNSMasq from being abused like this, and I've had to
> resort to iptables rules instead.  Is there a configuration option
> that that would disable responding to DNS queries from certain
> interfaces?  The other option that seems handy would be one to only
> reply to DNS queries from hosts that have a configured DHCP lease.
> Are there any features of DNSMasq that would prevent it from being
> abused to conduct attacks?
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss at lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss

I instantly thought of the '-interface' & '-except-interface' options. 
I'm probably missing something.


Kevin at Darbyshire-Bryant.me.uk {TB}
M: +44 7947 355344 H: +44 1256 478597

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