How many root DNS servers are reachable over Internet II?
December 20, 2006
After yesterday, I decided to spend some time working out how many of the root DNS servers are reachable over our Internet II link. The answer surprised me: 9 out of the 13 root nameservers are reachable over Internet II.
(The necessary disclaimer: your view of what is reachable over Internet II may well vary from ours due to routing and local policy issues.)
We prefer to send packets over our Internet II link, so working out this number was relatively simple. I got a list of the IP addresses of the root nameservers, then ran traceroute on each, set to stop after the hop that's different between our Internet II and our regular connection, then looked for ones that went through the I2 connection.
(To make it faster I used traceroute's
The root nameservers that are not reachable over our Internet II link are:
The NASA one surprises me a little bit, although it may be the result of routing policy choices.
Written on 20 December 2006.
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