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Internet connectivity to the hosts PingER monitors in Japan was maintained. Round Trip Times (RTT) to some hosts increased significantly as seen from SLAC. However as seen from RIKEN in Japan they did not increase. It appears the increase in RTT depends on the route from the monitoring host to Japan. This suggests a possible cable disruption. For more on cables see here.
While the Internet appears to have kept running remarkably well (though some end hosts hosts were not reachable a day later), the phone network did not fare so well.
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However as can be seen from the map below, we were not monitoring a Japanese host near the epicenter.
On 3/12/2011 we added Tohoku University (www.tohoku.ac.jp), which we were not monitoring previously, . It is on the outskirts of Sendai and close to the earthquake. At first (on 3/12/2011 12:46pm PST) it was not responding. It did respond on 3/1214/2011 at 12:46pm PST45pm PDT.
| Code Block |
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53cottrell@pinger:~>ping www.tohoku.ac.jp ping: unknown host www.tohoku.ac.jpExit 2 |
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| Code Block |
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60cottrell@pinger:~>ping www.jp.kek
ping: unknown host www.jp.kek
Exit 2
64cottrell@pinger:~>ping 130.87.104.107
PING 130.87.104.107 (130.87.104.107) 56(84) bytes of data.
From 134.79.252.133 icmp_seq=31 Destination Host Unreachable
From 134.79.252.133 icmp_seq=58 Destination Host Unreachable
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It was responding again at 1:10pm 3/14/2011 PDT.
| Code Block |
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54cottrell@pinger:~>ping www.kek.jp
PING wlb00dn1.kek.jp (130.87.104.107) 56(84) bytes of data.
64 bytes from wlb00dn1.kek.jp (130.87.104.107): icmp_seq=0 ttl=237 time=276 ms
64 bytes from wlb00dn1.kek.jp (130.87.104.107): icmp_seq=1 ttl=237 time=276 ms
64 bytes from wlb00dn1.kek.jp (130.87.104.107): icmp_seq=2 ttl=237 time=276 ms
--- wlb00dn1.kek.jp ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 276.357/276.388/276.437/0.608 ms, pipe 2
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Japanese hosts seen From SLAC
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