[outages] 4.2.2.x DNS?

[Seth Mattinen]

Tim Wilde wrote:
> Patrick W. Gilmore wrote:
>> Works here.
>>
>> However, we are downstream of Level 3 / as3356.  I heard a rumor they
>> ACL'ed queries from sources outside their downstream cone.
> 
> Based on some (relatively unscientific) experimentation, this does
> appear to be true.  From sources that reach 4.2.2.1 via what appear to
> be peering links (such as an XO / Level(3) interconnect) queries time
> out, while sources that reach 4.2.2.1 via what appear to be transit
> links have no problems with consistent resolution.
> 
> I can't really blame them, as a) open recursive DNS servers are rife for
> DNS amplification abuse, and b) this must be an enormous resource
> consumer for them.  Probably a boon for OpenDNS and any others in the
> open/semi-open resolver space.
> 

Just to throw some unscientific information in the mix, I can query them 
from AS11170 downstream of Sprint (best path) and SAVVIS. Only did two 
queries though, so it's not a good reliability test. ;)

~Seth