[dns-operations] f.root IPv6 highly biased towards one instance

Jim Martin jrmii at isc.org
Tue Dec 15 17:42:15 UTC 2015


Sebastian,
	Thanks for the note. As you suspected, this is a local node and it shouldn’t be attracting traffic outside of the local exchange. It’s almost definitely someone stripping our NO_EXPORT advertisement, but we’ll know for certain shortly.  More info as I get it.

	- Jim

> On Dec 15, 2015, at 12:08 PM, Sebastian Wiesinger <sebastian at karotte.org> wrote:
> 
> Hello,
> 
> I noticed that connections to f.root-servers.net IPv6 address
> (2001:500:2f::f) is highly biased towards the SXM1 location. When
> checking all RIPE atlas probes most of the answers are coming from sxm1a:
> 
> 45740   sxm1a.f.root-servers.org
> 6340    pao1a.f.root-servers.org
> 6200    pao1b.f.root-servers.org
> 5489    ams1b.f.root-servers.org
> 4407    ams1a.f.root-servers.org
> 2923    sxm1b.f.root-servers.org
> 2873    fra1a.f.root-servers.org
> 2816    fra1b.f.root-servers.org
> 1292    svo1b.f.root-servers.org
> 1287    svo1a.f.root-servers.org
> 
> This is the local node at the Netherlands Antilles.
> 
> Data comes from https://atlas.ripe.net/measurements/11404/
> 
> When checking the beginning of 2015 it looks different:
> 
> 28177   ord1b.f.root-servers.org
> 27684   ord1a.f.root-servers.org
> 6180    ams1b.f.root-servers.org
> 5834    pao1a.f.root-servers.org
> 5656    pao1b.f.root-servers.org
> 4653    atl1a.f.root-servers.org
> 4286    ams1a.f.root-servers.org
> 3386    atl1b.f.root-servers.org
> 3001    fra1a.f.root-servers.org
> 2578    fra1b.f.root-servers.org
> 
> As sxm1 is supposed to be a "local" instance I think that this might
> be an error?
> 
> Right now I have a latency of around 150ms via IPv6 and 21ms via IPv4
> towards f-root from my location.
> 
> I have the feeling this might be because HE is using this node and
> most traffic goes over HE, at least from locations I can check right
> now. Am I reading this wrong or should I give HE a heads up?
> 
> Regards
> 
> Sebastian
> 
> --
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