random dns queries with random sources

Doug Barton dougb at dougbarton.us
Wed Feb 19 04:25:35 UTC 2014


On 02/18/2014 07:59 PM, Joe Maimon wrote:
>
>
> Doug Barton wrote:
>> On 02/18/2014 07:08 PM, Joe Maimon wrote:
>>> Thousand of queries with thousands of source ip addresses.
>>
>> Pardon if I missed a memo, but how are your resolver systems receiving
>> these thousands of very different source addresses?
>>
>> Doug
>>
>>
>
> Thousands of queries _from_ thousands of source ip addresses
>
> likely they are spoofed

Yes, got that bit. :)  What I'm asking is, why are spoofed queries 
hitting your "different resolvers, routers with proxy turned on, etc.?"

Are you running open resolvers? If so, please stop doing that, it's 
widely known to be a bad idea for over a decade now, and you are 
providing the bad guys a tool to use for DDOS attacks.

If it's something else, please speak up. Regardless of the goal of this 
particular issue, the way to solve the root problem is to prevent the 
spoofed packets from getting to your servers in the first place.

Doug




More information about the NANOG mailing list