Monday, March 14, 2011

Internet Conectivity after Japan Quake

My heart goes out to the people of Japan. We all know how vital communication services are to their rescue and recovery efforts. Here is an article from the Rensys blog.


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Today's 8.9 magnitude earthquake in Japan has had surprisingly limited impacts on the structure and routing dynamics of the regional Internet. Of roughly 6,000 Japanese network prefixes in the global routing table, only about 100 were temporarily withdrawn from service — and that number has actually decreased in the hours since the event. Other carriers around the region have reported congestion and drops in traffic due to follow-on effects of the quake, but most websites are up and operational, and the Internet is available to support critical communications.


Those who have been following our blogs on Libya will be familiar with the excellent Google Transparency Report, which summarizes the rate of queries coming from each country over time. Despite terrible fires, floods, and power outages, traffic from Japanese clients just keeps going. It's quite a remarkable plot.

Why have we not seen more impact on international Internet traffic from this incredibly devastating quake? We don't know yet, but we'll keep studying the situation. Compared to the 2006 Taiwan earthquake, which resulted in a larger number of major cable breaks, it appears that the majority of the region's submarine cables have escaped the worst damage, and diverse capacity remains to carry traffic around the points of damage.

jpix_in.gif In- and out-bound traffic at the Japan Internet Exchange dropped by some 25 gigabits per second after the quake .. and then climbed back to robust levels by the end of the day.

jpnap-13-mar-2011.png Traffic at the JPNAP also seems to be down by only about 10% over its historical rates from the last two weeks.

Click here for the rest of the story...

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