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■（緊急）BIND 9.xのネガティブキャッシュ機能の実装上のバグによる
    namedのサービス停止について - バージョンアップを強く推奨 - 
    http://jprs.jp/tech/security/2011-05-27-bind9-vuln-large-rrsig-and-ncache.html 
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http://www.pcworld.com/businesscenter/article/145945/dns_trouble_knocks_nsa_off_internet.html

DNS Trouble Knocks NSA off Internet