Page History

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The map below shows the location of the hosts.

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Conclusion It is not the site RIKEN that has gone bad, rather it is some of the routes

RIKEN Looking at Japan

Japanese hosts seen from JP.RIKEN.N3 (RIKEN) see no impact on RTT

It looks the problem is in the route to Japan not within Japan itself. I wonder if the undersea earthquake has disrupted some  cables? This appears to be in line with the information from [http://www.renesys.com/blog/2011/03/japan-quake.shtml|http://www.renesys.com/blog/2011/03/japan-quake.shtml] and[http://www.networkworld.com/news/2011/031411-quake-damage-to-japan-cables.html?source=NWWNLE_nlt_network_architecture_2011-03-15|http://www.networkworld.com/news/2011/031411-quake-damage-to-japan-cables.html?source=NWWNLE_nlt_network_architecture_2011-03-15].

Undersea Cables

A map of the cables from Telegeography is seen below:

The following quote from Telegeography on 4/11/2011 confirms our early suspicions that the initial impact was probably due to rerouting of traffic as some undersea route were affected.

The massive earthquake off the coast of Japan damaged several undersea cables, some of which are still awaiting repair. Despite these outages, communications between Japan and the rest of the world were largely unaffected, due to the large array of undersea cables linked to Japan. ‘The earthquake temporarily knocked out approximately 30% of Japan’s international capacity,’ according to TeleGeography Research Director Alan Mauldin. ‘The deployment of multiple new trans-Pacific cables and intra-Asian cables over the past three years proved instrumental in preventing this disaster from also disrupting communications.’

Longer term impacts

However, we were not monitoring a Japanese host near the epicenter.

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