Internet Infrastructure Review (IIR) Vol.14
February 2012

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• Executive Summary[868KB]
• Infrastructure Security "Targeted Attacks and Their Handling" [2.1MB]

  In this report we discuss the targeted attacks that have received significant attention since last September, and examine the exploitation of fraudulently issued certificates.

• Messaging Technology "The State of Spam Originating from Japan"[1.1MB]

  In this report we will present an overview of spam trends for week 40 through week 52 of 2011. The ratio of spam has continued to decrease since the last survey, but there has been almost no change in the actual volume of spam from Japan. The ratio of “pass” results indicating that sender authentication was successful climbed to 42.1%, exceeding the ratio of “none” results for the first time.

• Network Technology "IPv4 Address Sharing Technology in the IPv6 Era" [1.1MB]

  We examine the characteristics of “stateful” and “stateless” address sharing technologies, and discuss the current state of IPv4 address sharing technology based on our experience with experimental implementation of 4rd using SEIL series routers that we presented in IIR Vol.13.

• Internet Topics "Energy-Saving Technology Required for Data Centers"[934KB]