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

[Sebastian Wiesinger]

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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