Internet Infrastructure Review (IIR) Vol.12
August 2011

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• Executive Summary[536KB]
• Infrastructure Security "Continuing Attacks on Companies and Government-Related Organizations" [1.42MB]

  In this report we examine the details of a series of attacks on companies and government-related organizations that have been occurring since the end of last year, and discuss guidelines for dealing with DDoS attacks at telecommunications carriers.

• Messaging Technology "Ratio and Volume of Spam Originating from China Rises Sharply" [801KB]

  In this report we will present an overview of spam trends for week 14 through week 26 of 2011. As was the case in the previous study, China was the number one source of spam. The ratio of spam from China has been surging rapidly since February 2011.

• Broadband Traffic Report "Examining the Impact of the Earthquake on Traffic on a Macro Level" [1.52MB]

  The Great East Japan Earthquake in March 2011 also caused extensive damage to communications infrastructure. However, when examining this on a macro level, the earthquake had only a limited impact on traffic. Here we report on the impact that the Great Earth Japan Earthquake had on traffic, and then go on to investigate the changes in traffic compared to 2010 using traffic and port usage levels for the week starting May 30, 2011.

• Internet Topics "The Blocking of Child Pornography by ISPs in Japan"[652KB]