\n\u25cb DNS\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0
\n<\/p>\n
IPv6,DNSSEC\u306a\u3069\u3067\u3001DNS\u30b5\u30fc\u30d0\u306e\u8981\u4ef6\u304c\u5927\u304d\u304f\u304b\u308f\u3063\u3066\u3044\u307e\u3057\u305f\u3002
\nISP\u904b\u7528\u306a\u3089\u4e0d\u53ef\u907f\u306a\u5185\u5bb9\u306a\u306e\u3067\u30e1\u30e2\u3092\u3002<\/p>\n
\r\n\u25a1 DNS\u306e512byte\u306e\u58c1<\/U>\r\n\u5143\u6765\u3001DNS\u554f\u3044\u5408\u308f\u305b\u30fb\u5fdc\u7b54\u306f(\u30d8\u30c3\u30c0\u3092\u9664\u304f)\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u304c512byte\u4ee5\u4e0b\u3067\u306a\u3044\u3068\u3044\u3051\u307e\u305b\u3093\u3067\u3057\u305f\u3002*RFC1035\r\n\u5f53\u6642\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306e\u4fe1\u983c\u6027\u3092\u8003\u616e\u3057\u305f\u6642\u30011\u30d1\u30b1\u30c3\u30c8\u3067\u3046\u3051\u3068\u308c\u308b\u30b5\u30a4\u30ba=576byte\u306b\u5165\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u305f\u306e\u3067\u3057\u305f\u3002*RFC791\r\n\uff0aA\u30ec\u30b3\u30fc\u30c9\u306e\u30e9\u30a6\u30f3\u30c9\u30ed\u30d3\u30f3\u30678\u30ec\u30b3\u30fc\u30c9\u4ee5\u4e0a\u3092\u898b\u306a\u3044\u306e\u306f\u3053\u306e\u30b5\u30a4\u30ba\u304c\u9650\u754c\u306b\u306a\u308b\u304b\u3089\u306e\u3088\u3046\u3067\r\n\r\nIPv6\u306e\u767b\u5834\u3001DNSSEC\u5bfe\u5fdc\u3001spam\u5bfe\u5fdc\u306eTXT\u30ec\u30b3\u30fc\u30c9\u3001DomainKeys\u306a\u3069\u306a\u3069DNS\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u305f\u3084\u308a\u3068\u308a\u304c\r\n\u3075\u3048\u3066\u304d\u305f\u3053\u3068\u306b\u3088\u308a\u3001DNS\u5fdc\u7b54\u306e\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u304c512byte\u3068\u3044\u3046\u306e\u306f\u73fe\u5b9f\u7684\u3067\u306f\u306a\u304f\u306a\u3063\u3066\u304d\u307e\u3057\u305f\u3002\r\n\u3067\u3001512byte\u306e\u58c1\u3092\u3053\u3048\u308b\u305f\u3081\u306e\u624b\u6cd5\u304c\r\n\r\n\u30fbTCP Fallback\r\n\u30fbEDNS0\r\n\u3068\u306a\u308a\u307e\u3059\u3002\r\n\r\n\u25a1 TCP Fallback<\/U>\r\n\u5b9f\u969b\u306bdig\u30b3\u30de\u30f3\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3059\u3002\r\n512byte\u3088\u308a\u5927\u304d\u3044\u30c7\u30fc\u30bf\u3067\u5fdc\u7b54\u304c\u5e30\u3063\u3066\u304f\u308bgTLD(.gov)\u3092\u516c\u958bDNS\u306b\u805e\u3044\u3066\u307f\u307e\u3059\u3002\r\n\r\n$ dig @4.2.2.1 +dnssec +bufsize=512 gov\r\n;; Truncated, retrying in TCP mode. *1)<\/font>\r\n\r\n; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.2 <<>> @4.2.2.1 +dnssec +bufsize=512 gov\r\n; (1 server found)\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37290\r\n;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 1\r\n\r\n;; OPT PSEUDOSECTION:\r\n; EDNS: version: 0, flags: do; udp: 4096\r\n;; QUESTION SECTION:\r\n;gov. IN A\r\n\r\n;; AUTHORITY SECTION:\r\ngov. 71114 IN SOA a.usadotgov.net. nstld.verisign-grs.com. 1353927601 3600 900 1814400 86400\r\ngov. 71114 IN RRSIG SOA 7 1 86400 20121201100021 20121126100021 11596 gov. CzGbjEQvgj14d2nXlK5kyZtBTGSf46AKU5Kv1f+yw7Ez7JHOv++88Mih 4nMf\/vIB04\/zycK2Cv4qmnQZ5cJBuQ5gR3v5Pi0xEDefEjuIZHLFf61F wFkdpamKn\/fNA0SRMFZzvvYCJI451ONyGoT\/+V6GJr4bkHPvFwPgw1ok gr08mH2hp1Q6h+bfcZkmNrm3LGrDzqpfUsb2Yc+WhO7MV6jTksMPe\/0A Wil9cmBZq1dUJYyaxstSvG6Ete53cxGJQBXJ5PONvj0CcVovKITY\/CBE Ep5aCP6uaVYjT2H10QXqUSWnbVNF6M+n9n3YzH1xUOu2H1ttUVeEJKDh e+iiuw==\r\n578et16s7ltnsq1t0amm21gl20oj5g76.gov. 71114 IN NSEC3 1 0 8 4C44934802D3 578H5NT2EIQH2T6CETLNEBNTL52T0ET8 NS SOA RRSIG DNSKEY NSEC3PARAM\r\n578et16s7ltnsq1t0amm21gl20oj5g76.gov. 71114 IN RRSIG NSEC3 7 2 86400 20121201100021 20121126100021 11596 gov. oToOjRlj4fMiPWTlbKbPdg0nPhorEAVy319tot3LnbckP\/nfBD7G+Fvm yuPUVCTSRcpdKPb+Y8kqJsQVfUz2SyHjiIGVHq0hOIDFPzp\/0giWjwfI h\/wJ2wqr7TsJqgITsNrFaSBvVjSY3ILZVn5tbeBmHM\/JlG0x7CbQ6kHI apokRROyvEB4o3i3OxKWhSGn3scoUyT3lQCIQ6Km\/r6vSmQ+GYsNJzTP eo0q1TmCvuxY1bY5euoFqrByoy5k1O1v+9hpn1cHADuHjFDJh8rWNFiz \/3Bk1wwXfVIyfdp\/HXq0SiNj+WvNhKN8ZfeCyBdctDMBQIhzQI46npJm aqCJ7w==\r\n\r\n;; Query time: 111 msec\r\n;; SERVER: 4.2.2.1#53(4.2.2.1)\r\n;; WHEN: Tue Nov 27 00:22:45 2012\r\n;; MSG SIZE rcvd: 773 *2)<\/font>\r\n\r\n*1) Truncated\u3057\u305f\u306e\u3067TCP\u3067\u30ea\u30c8\u30e9\u30a4\u3057\u307e\u3057\u305f\u3068\u3044\u3063\u3066\u307e\u3059\u3002\r\n*2) MSG SIZE\u304c773(512byte)\u4ee5\u4e0a\u3067\u3059\u3002\r\n<\/p>\r\n\u3053\u308c\u3082RFC\u306e\u4ed5\u69d8\u3067\u3059\u304c\u3001DNS Request Query\u306f\u304b\u306a\u3089\u305aUDP\u3067\u554f\u3044\u5408\u308f\u305b\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u306e\u3067\u3001\r\n\uff11\uff0eUDP\u3067\u554f\u3044\u3042\u308f\u305b\r\n\uff12\uff0eRespose\u306e\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u304c512byte\u3092\u3053\u3048\u308b\u3068\u304d\u3001\u6a29\u9650\u30b5\u30fc\u30d0\u306f\u3001TCbit=1(Truncated) \u3092\u3064\u3051\u3066\u8fd4\u3059\r\n\uff13\uff0eTruncated\u3092\u53d7\u3051\u53d6\u3063\u305f\u554f\u3044\u5408\u308f\u305b\u30b5\u30fc\u30d0\u306f\u3001TCP\u3067\u554f\u3044\u3042\u308f\u305b\u3057\u306a\u304a\u3059\r\n\r\n\u3053\u308c\u304cTCP FallBack\u3067\u3059\u3002\r\n\r\n\u25a1 EDNS0<\/U>\r\nTCP Fallback\u3067512byte\u306e\u58c1\u3092\u8d8a\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u304c\u3001\r\n\u305d\u3082\u305d\u3082DNS\u306e\u5fdc\u7b54\u901f\u5ea6\u306f\u30e6\u30fc\u30b6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306eRTT\u306b\u76f4\u7d50\u3059\u308b\u306e\u3067\u3001\r\n\u8fd4\u3059\u3060\u3051\u306a\u3089UDP\u306e\u307b\u3046\u304c\u306f\u3084\u304f\u3066\u3088\u3044\u3067\u3059\u3002\r\n\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u4fe1\u983c\u6027\u3001\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308bCPU\u306e\u51e6\u7406\u80fd\u529b\u5411\u4e0a\u3088\u308a\u3001\r\nUDP\u3067\u5927\u304d\u3044\u30b5\u30a4\u30ba\u3082\u6271\u3044\u307e\u3057\u3087\u3046\u3068\u3057\u305f\u306e\u304c\u3001EDNS0\u3067\u3059\u3002\r\n
\r\n$ dig @4.2.2.1 +dnssec gov\r\n\r\n; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.2 <<>> @4.2.2.1 +dnssec gov\r\n; (1 server found)\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49273\r\n;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 1\r\n\r\n;; OPT PSEUDOSECTION:\r\n; EDNS: version: 0, flags: do; udp: 4096 *1)<\/font>\r\n;; QUESTION SECTION:\r\n;gov. IN A\r\n\r\n;; AUTHORITY SECTION:\r\ngov. 70843 IN SOA a.usadotgov.net. nstld.verisign-grs.com. 1353927601 3600 900 1814400 86400\r\ngov. 70843 IN RRSIG SOA 7 1 86400 20121201100021 20121126100021 11596 gov. CzGbjEQvgj14d2nXlK5kyZtBTGSf46AKU5Kv1f+yw7Ez7JHOv++88Mih 4nMf\/vIB04\/zycK2Cv4qmnQZ5cJBuQ5gR3v5Pi0xEDefEjuIZHLFf61F wFkdpamKn\/fNA0SRMFZzvvYCJI451ONyGoT\/+V6GJr4bkHPvFwPgw1ok gr08mH2hp1Q6h+bfcZkmNrm3LGrDzqpfUsb2Yc+WhO7MV6jTksMPe\/0A Wil9cmBZq1dUJYyaxstSvG6Ete53cxGJQBXJ5PONvj0CcVovKITY\/CBE Ep5aCP6uaVYjT2H10QXqUSWnbVNF6M+n9n3YzH1xUOu2H1ttUVeEJKDh e+iiuw==\r\n578et16s7ltnsq1t0amm21gl20oj5g76.gov. 70843 IN NSEC3 1 0 8 4C44934802D3 578H5NT2EIQH2T6CETLNEBNTL52T0ET8 NS SOA RRSIG DNSKEY NSEC3PARAM\r\n578et16s7ltnsq1t0amm21gl20oj5g76.gov. 70843 IN RRSIG NSEC3 7 2 86400 20121201100021 20121126100021 11596 gov. oToOjRlj4fMiPWTlbKbPdg0nPhorEAVy319tot3LnbckP\/nfBD7G+Fvm yuPUVCTSRcpdKPb+Y8kqJsQVfUz2SyHjiIGVHq0hOIDFPzp\/0giWjwfI h\/wJ2wqr7TsJqgITsNrFaSBvVjSY3ILZVn5tbeBmHM\/JlG0x7CbQ6kHI apokRROyvEB4o3i3OxKWhSGn3scoUyT3lQCIQ6Km\/r6vSmQ+GYsNJzTP eo0q1TmCvuxY1bY5euoFqrByoy5k1O1v+9hpn1cHADuHjFDJh8rWNFiz \/3Bk1wwXfVIyfdp\/HXq0SiNj+WvNhKN8ZfeCyBdctDMBQIhzQI46npJm aqCJ7w==\r\n\r\n;; Query time: 141 msec\r\n;; SERVER: 4.2.2.1#53(4.2.2.1)\r\n;; WHEN: Tue Nov 27 00:25:30 2012\r\n;; MSG SIZE rcvd: 773\r\n\r\n*1) EDNSversion\u304c0,udp 4096byte\u307e\u3067\u62e1\u5f35\u3055\u308c\u3066\u3044\u308b\u3068\u3044\u3063\u3066\u307e\u3059\u3002\r\n<\/p>\r\n\uff0a dig\u306eoption\u3067 +dnssec\u3068\u3059\u308c\u3070\u81ea\u52d5\u7684\u306bEDNS0\u304c\u6709\u52b9\u306b\u306a\u308a\u307e\u3059\u3002\r\n\uff11\uff0e\u306f\u3058\u3081\u306e\u554f\u3044\u5408\u308f\u305b\u3067OPT\u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001EDNS\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u4f1d\u3048\u307e\u3059\u3002\r\n\uff12\uff0e\u6b63\u3057\u3044\u5fdc\u7b54\u304c\u304b\u3048\u3063\u3066\u304f\u308c\u3070\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u3066\u3001\u6b21\u56de\u3088\u308a\u3001Request\u306bEDS0\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\r\n\r\n\u3061\u306a\u307f\u306bBind9\u304b\u3089default\u3067\u3000EDNS0\u304c\u6709\u52b9\u306a\u306e\u3067disable\u306b\u3059\u308b\u306b\u306f\u3001named.conf\u306b\r\n
\r\noptions {\r\n edns no;\r\n}\r\nor\r\nserver 192.168.0.1 {\r\n edns no;\r\n}\r\n<\/p>\r\n\u3068\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\r\n\r\n\u25a1 \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a4\u30f3\u30d5\u30e9\u5074\u306eEDNS0\u5bfe\u5fdc<\/U>\r\nDNS\u306e\u8981\u4ef6\u304c\u304b\u308f\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u9014\u4e2d\u306b\u30ec\u30ac\u30b7\u30fc\u306aF\/W\u3084LSB\u304c\u3042\u308c\u3070Drop\u3059\u308b\u5371\u967a\u6027\u304c\u3042\u308b\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\r\nF\/W \u2192 512byte\u4ee5\u4e0a\u306f\u4e0d\u6b63\u306aDNS\u30d1\u30b1\u30c3\u30c8\u3068\u3057\u3066\u3057\u307e\u3046\r\nSLB \u2192 UDP\u306e\u30bb\u30c3\u30b7\u30e7\u30f3table\u306e\u98fd\u548c\u3092\u9632\u3050\u305f\u3081\u3001DNS\u306eflagmentpacket\u304c\u901a\u3089\u306a\u3044\r\n\u3000\u3000\u3000\u3000\uff11\uff0eUDP\u306fFIN\u304c\u306a\u3044\u306e\u3067\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u3042\u308b\u7a0b\u5ea6\u4fdd\u6301\u3057\u3066\u304a\u304b\u306a\u304f\u3066\u306f\u306a\u3089\u306a\u3044\r\n\u3000\u3000\u3000\u3000\uff12\uff0eDNS\u30af\u30a8\u30ea\u306f\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u591a\u304f\u306a\u308b\u6027\u8cea\u306e\u3071\u3051\u3063\u3068\u306a\u306e\u3067\u3001\u30bb\u30c3\u30b7\u30e7\u30f3table\u306e\u98fd\u548c\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u76f4\u7d50\u3059\u308b\r\n\u3000\u3000\u3000\u3000\uff13\uff0eDNS\u306f512byte\u4ee5\u4e0b\u21921packet\u306a\u306e\u3067\u30ec\u30b9\u30dd\u30f3\u30b9\u30d1\u30b1\u30c3\u30c8\u304c\u304d\u305f\u3089\u3001\u5373\u30bb\u30c3\u30b7\u30e7\u30f3table\u3092\u524a\u9664\u3057\u3066\u3057\u307e\u304a\u3046\r\n\r\nBIND9\u4ee5\u964d\u3001EDNS0\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u6709\u52b9\u306a\u306e\u3067\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u3067\u3042\u3063\u3066\u3082\r\n\u4e0a\u8a18\u306e\u3088\u3046\u306a\u4ed5\u69d8\u3067\u52d5\u4f5c\u3055\u308c\u308b\u3068\u601d\u308f\u306c\u3068\u3053\u308d\u3067drop\u3055\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\r\n\r\nDNSSEC\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/a>\u304c\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\r\n\r\n(\u8ffd\u8a18)\r\nISP\u306b\u3044\u308b\u306a\u3089\u3070DNS\u306fMUST\u306a\u306e\u306f\u305a\u3067\u3059\u304c\u3001\u306f\u307e\u308a\u307e\u3057\u305f\u3002\r\n\u53c2\u8003\u306b\u306a\u3063\u305f\u3001\u89e3\u8aac\u30ea\u30f3\u30af\u3092\u7d39\u4ecb\u3057\u3066\u304a\u304d\u307e\u3059\u3002\r\nJPRS\u89e3\u8aac<\/a>\r\nDNSOPS\u89e3\u8aac<\/a>\r\n\r\n\u3053\u308c\u3092\u6a5f\u306bDNSOPS\u306eML\u306b\u767b\u9332\u3057\u3088\u3046\u304b\u3068\u601d\u3044\u307e\u3059\u3002\r\n<\/pre>\n
<\/tt><\/P><\/p>\n","protected":false},"excerpt":{"rendered":"
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