{"id":6990,"date":"2025-09-30T15:43:39","date_gmt":"2025-09-30T06:43:39","guid":{"rendered":"https:\/\/blog.since2020.jp\/?p=6990"},"modified":"2026-09-29T10:50:06","modified_gmt":"2026-09-29T01:50:06","slug":"dnscachepoisoning_glossary","status":"publish","type":"post","link":"https:\/\/since2020.jp\/media\/dnscachepoisoning_glossary\/","title":{"rendered":"DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u304b\u3089\u6700\u65b0\u306e\u653b\u6483\u624b\u6cd5\u30fb\u5bfe\u7b56\u307e\u3067\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u4ed5\u7d44\u307f\u3084\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u578b\u653b\u6483\u3001SAD DNS\u306a\u3069\u306e\u9032\u5316\u3057\u305f\u653b\u6483\u624b\u6cd5\u3092\u89e3\u8aac\u30022025\uff5e2026\u5e74\u306b\u78ba\u8a8d\u3055\u308c\u305fBIND\u306e\u8106\u5f31\u6027\u3084DNSSEC\u3001DNS Cookies\u3001\u30ed\u30b0\u76e3\u8996\u306a\u3069\u3001\u73fe\u5728\u6c42\u3081\u3089\u308c\u308b\u5b9f\u8df5\u7684\u306aDNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u307e\u3067\u308f\u304b\u308a\u3084\u3059\u304f\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n<h2>\u306f\u3058\u3081\u306b\uff1aDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u304c\u4eca\u3082\u91cd\u8981\u306a\u7406\u7531<\/h2>\n<p>Web\u30b5\u30a4\u30c8\u3092\u5229\u7528\u3059\u308b\u3068\u304d\u3001\u79c1\u305f\u3061\u306f\u901a\u5e38\u300c<a href=\"http:\/\/example.com\">example.com<\/a>\u300d\u306e\u3088\u3046\u306a\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u5165\u529b\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u304c\u901a\u4fe1\u306b\u5229\u7528\u3059\u308b\u306e\u306fIP\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u3053\u306e\u540d\u524d\u3068IP\u30a2\u30c9\u30ec\u30b9\u306e\u5bfe\u5fdc\u4ed8\u3051\u3092\u884c\u3046\u306e\u304cDNS\uff08Domain Name System\uff09\u3067\u3059\u3002<\/p>\n<p>DNS\u3067\u306f\u3001\u6bce\u56de\u6a29\u5a01DNS\u30b5\u30fc\u30d0\u30fc\u3078\u554f\u3044\u5408\u308f\u305b\u308b\u8ca0\u8377\u3092\u6e1b\u3089\u3059\u305f\u3081\u3001\u518d\u5e30DNS\u30ea\u30be\u30eb\u30d0\u30fc\u304c\u53d6\u5f97\u3057\u305f\u60c5\u5831\u3092\u4e00\u5b9a\u671f\u9593\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002\u3053\u306e\u4ed5\u7d44\u307f\u306f\u9ad8\u901f\u5316\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u304c\u3001\u3082\u3057\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u507d\u306e\u60c5\u5831\u3092\u767b\u9332\u3055\u308c\u308c\u3070\u3001\u6b63\u898f\u30b5\u30a4\u30c8\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u653b\u6483\u8005\u304c\u7528\u610f\u3057\u305f\u30b5\u30fc\u30d0\u30fc\u3078\u8a98\u5c0e\u3067\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3053\u308c\u304cDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3067\u3059\u3002<\/p>\n<p>2008\u5e74\u306b\u5927\u304d\u306a\u6ce8\u76ee\u3092\u96c6\u3081\u305f\u300c\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u578b\u653b\u6483\u300d\u4ee5\u964d\u3001DNS\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3067\u306f\u554f\u3044\u5408\u308f\u305bID\u3084\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u306a\u3069\u9632\u5fa1\u7b56\u304c\u5f37\u5316\u3055\u308c\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001DNS\u306e\u5b9f\u88c5\u3084\u5468\u8fba\u6a5f\u80fd\u306b\u5b58\u5728\u3059\u308b\u5f31\u70b9\u3092\u5229\u7528\u3057\u305f\u653b\u6483\u306f\u73fe\u5728\u3082\u7814\u7a76\u3055\u308c\u3066\u304a\u308a\u30012025\uff5e2026\u5e74\u306b\u3082BIND\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306b\u3064\u306a\u304c\u308b\u8106\u5f31\u6027\u304c\u516c\u8868\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><!-- notionvc: 7a6111ed-1525-43b4-8e3f-013aede504b9 --><\/p>\n<p><!-- notionvc: f1cc4f56-1181-4933-9732-bd2ddd152543 --><\/p>\n<h2>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u4ed5\u7d44\u307f<\/h2>\n<p>DNS\u306b\u306f\u5927\u304d\u304f\u5206\u3051\u3066\u3001\u30c9\u30e1\u30a4\u30f3\u60c5\u5831\u3092\u7ba1\u7406\u3059\u308b\u300c\u6a29\u5a01DNS\u30b5\u30fc\u30d0\u30fc\u300d\u3068\u3001\u5229\u7528\u8005\u304b\u3089\u306e\u554f\u3044\u5408\u308f\u305b\u3092\u53d7\u3051\u3066\u540d\u524d\u89e3\u6c7a\u3092\u884c\u3046\u300c\u518d\u5e30DNS\u30ea\u30be\u30eb\u30d0\u30fc\u300d\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u5229\u7528\u8005\u304c\u300cwww.example.com\u300d\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u8981\u6c42\u3059\u308b\u3068\u3001\u518d\u5e30\u30ea\u30be\u30eb\u30d0\u30fc\u306f\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u6a29\u5a01DNS\u30b5\u30fc\u30d0\u30fc\u306a\u3069\u3078\u554f\u3044\u5408\u308f\u305b\u3001\u305d\u306e\u7d50\u679c\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002\u6b21\u306e\u5229\u7528\u8005\u304b\u3089\u540c\u3058\u554f\u3044\u5408\u308f\u305b\u304c\u6765\u308c\u3070\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u305f\u60c5\u5831\u3092\u8fd4\u305b\u308b\u305f\u3081\u3001\u901a\u4fe1\u3092\u9ad8\u901f\u5316\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3067\u306f\u3001\u3053\u306e\u300c\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u300d\u3068\u3044\u3046\u4ed5\u7d44\u307f\u304c\u653b\u6483\u5bfe\u8c61\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u306f\u6b63\u898f\u306eDNS\u5fdc\u7b54\u306b\u898b\u305b\u304b\u3051\u305f\u507d\u5fdc\u7b54\u3092\u9001\u308a\u3001\u30ea\u30be\u30eb\u30d0\u30fc\u304c\u554f\u3044\u5408\u308f\u305b\u3066\u3044\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u507d\u60c5\u5831\u3092\u53d7\u3051\u5165\u308c\u3055\u305b\u3088\u3046\u3068\u3057\u307e\u3059\u3002\u6210\u529f\u3059\u308b\u3068\u3001\u6b63\u898f\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3059\u308b\u540d\u524d\u89e3\u6c7a\u7d50\u679c\u304c\u653b\u6483\u8005\u306eIP\u30a2\u30c9\u30ec\u30b9\u306a\u3069\u306b\u7f6e\u304d\u63db\u308f\u308a\u3001\u540c\u3058\u30ea\u30be\u30eb\u30d0\u30fc\u3092\u5229\u7528\u3059\u308b\u8907\u6570\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u304c\u53ca\u3076\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u88ab\u5bb3\u3068\u3057\u3066\u306f\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30b5\u30a4\u30c8\u3078\u306e\u8a98\u5c0e\u3001\u8a8d\u8a3c\u60c5\u5831\u306e\u7a83\u53d6\u3001\u30de\u30eb\u30a6\u30a7\u30a2\u914d\u5e03\u3001Web\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u969c\u5bb3\u306a\u3069\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002<!-- notionvc: 590a236e-2044-43d0-be11-1ba1662f945e --><\/p>\n<p><!-- notionvc: f15d90da-c291-41c7-b15f-7cb3505233c2 --><\/p>\n<h2>\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u578b\u653b\u6483\u3068SAD DNS<\/h2>\n<p><strong>\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u578b\u653b\u6483<\/strong><\/p>\n<p>2008\u5e74\u306b\u660e\u3089\u304b\u306b\u306a\u3063\u305f\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u578b\u653b\u6483\u306f\u3001DNS\u306e\u554f\u3044\u5408\u308f\u305bID\u3060\u3051\u3067\u306a\u304f\u3001\u554f\u3044\u5408\u308f\u305b\u5bfe\u8c61\u3084\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u306a\u3069\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u72d9\u3063\u3066\u5927\u91cf\u306e\u507d\u5fdc\u7b54\u3092\u9001\u308a\u8fbc\u3080\u3053\u3068\u3067\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3078\u306e\u4fb5\u5165\u78ba\u7387\u3092\u9ad8\u3081\u308b\u653b\u6483\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u554f\u984c\u3092\u5951\u6a5f\u3068\u3057\u3066\u3001DNS\u30ea\u30be\u30eb\u30d0\u30fc\u3067\u306f\u554f\u3044\u5408\u308f\u305bID\u3084UDP\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u306a\u3069\u304c\u5e83\u304f\u5b9f\u88c5\u3055\u308c\u307e\u3057\u305f\u3002\u73fe\u5728\u306eDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u5bfe\u7b56\u306e\u57fa\u672c\u306b\u306a\u3063\u3066\u3044\u308b\u8003\u3048\u65b9\u3067\u3059\u3002<\/p>\n<p><strong>SAD DNS<\/strong><\/p>\n<p>\u305d\u306e\u5f8c\u3082\u653b\u6483\u7814\u7a76\u306f\u7d9a\u3044\u3066\u3044\u307e\u3059\u30022020\u5e74\u306b\u767a\u8868\u3055\u308c\u305fSAD DNS\uff08Side-channel AttackeD DNS\uff09\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u30b5\u30a4\u30c9\u30c1\u30e3\u30cd\u30eb\u3092\u5229\u7528\u3057\u3066DNS\u901a\u4fe1\u306b\u95a2\u3059\u308b\u60c5\u5831\u3092\u63a8\u6e2c\u3057\u3001\u5f93\u6765\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u306b\u3088\u308b\u9632\u5fa1\u3092\u56de\u907f\u3059\u308b\u53ef\u80fd\u6027\u3092\u793a\u3057\u307e\u3057\u305f\u30022021\u5e74\u306b\u306fSAD DNS 2.0\u3082\u767a\u8868\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u300c\u554f\u3044\u5408\u308f\u305bID\u3068\u30dd\u30fc\u30c8\u3092\u30e9\u30f3\u30c0\u30e0\u5316\u3057\u3066\u304a\u3051\u3070\u5b8c\u5168\u306b\u5b89\u5168\u300d\u3068\u3044\u3046\u8003\u3048\u65b9\u3067\u306f\u306a\u304f\u3001DNS\u30ea\u30be\u30eb\u30d0\u30fc\u305d\u306e\u3082\u306e\u3092\u7d99\u7d9a\u7684\u306b\u66f4\u65b0\u3057\u3001\u591a\u5c64\u7684\u306b\u9632\u5fa1\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p><!-- notionvc: d7e8946c-b454-4585-95d7-acdcb320e140 --><\/p>\n<p><!-- notionvc: 5762c981-3fde-41c9-b9f6-019fab412398 --><\/p>\n<h2>2025\uff5e2026\u5e74\u306b\u3082\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u8106\u5f31\u6027\u304c\u767a\u898b<\/h2>\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306f\u904e\u53bb\u306e\u554f\u984c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u4f8b\u3048\u3070BIND 9\u3067\u306f2025\u5e74\u306b\u3001\u7591\u4f3c\u4e71\u6570\u751f\u6210\u5668\uff08PRNG\uff09\u306e\u5f31\u70b9\u306b\u3088\u3063\u3066\u653b\u6483\u8005\u304c\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u3068\u554f\u3044\u5408\u308f\u305bID\u3092\u4e88\u6e2c\u3067\u304d\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u300cCVE-2025-40780\u300d\u304c\u516c\u8868\u3055\u308c\u307e\u3057\u305f\u3002\u5f71\u97ff\u3092\u53d7\u3051\u308b\u306e\u306f\u4e3b\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u884c\u3046\u30ea\u30be\u30eb\u30d0\u30fc\u3067\u3001ISC\u306f\u4fee\u6b63\u7248\u3078\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3092\u6848\u5185\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u540c\u3058\u304f2025\u5e74\u306b\u306f\u3001\u4e0d\u8981\u306a\u30ea\u30bd\u30fc\u30b9\u30ec\u30b3\u30fc\u30c9\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3078\u6ce8\u5165\u3067\u304d\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u300cCVE-2025-40778\u300d\u3082\u516c\u958b\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u3061\u3089\u3082\u30ea\u30be\u30eb\u30d0\u30fc\u304c\u5f71\u97ff\u3092\u53d7\u3051\u308b\u8106\u5f31\u6027\u3067\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b2026\u5e747\u6708\u306b\u306f\u3001RRSIG\u3068\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u306e\u51e6\u7406\u306b\u95a2\u3059\u308b\u300cCVE-2026-11721\u300d\u304c\u516c\u958b\u3055\u308c\u3001\u7279\u5b9a\u6761\u4ef6\u4e0b\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u793a\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u308c\u3089\u306e\u4e8b\u4f8b\u304b\u3089\u5206\u304b\u308b\u306e\u306f\u3001DNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3067\u306f\u300c\u53e4\u5178\u7684\u306a\u653b\u6483\u3078\u306e\u5bfe\u7b56\u300d\u3060\u3051\u3067\u306f\u4e0d\u5341\u5206\u3060\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002DNS\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u306e\u5b9f\u88c5\u4e0a\u306e\u554f\u984c\u3082\u542b\u3081\u3001\u7d99\u7d9a\u7684\u306a\u30d1\u30c3\u30c1\u9069\u7528\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<p><!-- notionvc: efc0832a-f9cb-46f9-a426-3c0e953d9196 --><\/p>\n<h2>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3078\u306e\u4e3b\u306a\u5bfe\u7b56<\/h2>\n<p><strong>DNSSEC\u3092\u5c0e\u5165\u3059\u308b<\/strong><\/p>\n<p>DNSSEC\uff08DNS Security Extensions\uff09\u306f\u3001DNS\u30ec\u30b3\u30fc\u30c9\u306b\u96fb\u5b50\u7f72\u540d\u3092\u4ed8\u3051\u3001\u30ea\u30be\u30eb\u30d0\u30fc\u304c\u5fdc\u7b54\u306e\u6b63\u5f53\u6027\u3092\u691c\u8a3c\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n<p>\u554f\u3044\u5408\u308f\u305bID\u3084\u30dd\u30fc\u30c8\u756a\u53f7\u306e\u63a8\u6e2c\u3092\u56f0\u96e3\u306b\u3059\u308b\u5f93\u6765\u578b\u306e\u9632\u5fa1\u3068\u306f\u7570\u306a\u308a\u3001\u300c\u305d\u306eDNS\u60c5\u5831\u304c\u6b63\u3057\u304f\u7f72\u540d\u3055\u308c\u305f\u3082\u306e\u304b\u300d\u3092\u691c\u8a3c\u3059\u308b\u70b9\u304c\u5927\u304d\u306a\u7279\u5fb4\u3067\u3059\u3002ISC\u3082\u3001DNS\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u6839\u672c\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u554f\u984c\u306b\u5bfe\u3059\u308b\u5b8c\u5168\u306a\u89e3\u6c7a\u7b56\u3068\u3057\u3066DNSSEC\u3092\u4f4d\u7f6e\u4ed8\u3051\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001DNSSEC\u3092\u5c0e\u5165\u3059\u308c\u3070\u3059\u3079\u3066\u306eDNS\u653b\u6483\u3092\u9632\u3052\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u9375\u7ba1\u7406\u3001\u7f72\u540d\u3001\u691c\u8a3c\u3001\u8a2d\u5b9a\u30df\u30b9\u306a\u3069\u3001\u904b\u7528\u9762\u306e\u554f\u984c\u306b\u3082\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p><strong>\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u3084\u554f\u3044\u5408\u308f\u305b\u60c5\u5831\u3092\u30e9\u30f3\u30c0\u30e0\u5316\u3059\u308b<\/strong><\/p>\n<p>DNS\u30ea\u30be\u30eb\u30d0\u30fc\u3067\u306f\u3001\u554f\u3044\u5408\u308f\u305bID\u3084\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u3092\u4e88\u6e2c\u3055\u308c\u306b\u304f\u304f\u3059\u308b\u3053\u3068\u304c\u57fa\u672c\u7684\u306a\u9632\u5fa1\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001BIND\u3067\u306f2025\u5e74\u306e\u8106\u5f31\u6027\u306e\u3088\u3046\u306b\u3001\u4e71\u6570\u751f\u6210\u306e\u5b9f\u88c5\u305d\u306e\u3082\u306e\u304c\u554f\u984c\u306b\u306a\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5358\u306b\u300c\u30e9\u30f3\u30c0\u30e0\u5316\u3055\u308c\u3066\u3044\u308b\u304b\u3089\u5b89\u5fc3\u300d\u3068\u8003\u3048\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u5229\u7528\u3057\u3066\u3044\u308bDNS\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u6700\u65b0\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4fee\u6b63\u7248\u3078\u66f4\u65b0\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p><strong>DNS Cookies\u3092\u6d3b\u7528\u3059\u308b<\/strong><\/p>\n<p>DNS Cookies\u306f\u3001DNS\u901a\u4fe1\u306e\u76f8\u624b\u304c\u6b63\u5f53\u306a\u901a\u4fe1\u76f8\u624b\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002UDP\u3092\u5229\u7528\u3059\u308bDNS\u306f\u9001\u4fe1\u5143\u3092\u507d\u88c5\u3055\u308c\u3084\u3059\u3044\u305f\u3081\u3001DNS Cookies\u306b\u3088\u3063\u3066\u507d\u88c5\u901a\u4fe1\u3078\u306e\u8010\u6027\u3092\u9ad8\u3081\u3089\u308c\u307e\u3059\u3002BIND\u3067\u306fDNS Cookies\u3078\u306e\u5bfe\u5fdc\u304c\u9032\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u30aa\u30fc\u30d7\u30f3\u30ea\u30be\u30eb\u30d0\u30fc\u3092\u907f\u3051\u308b<\/strong><\/p>\n<p>\u8ab0\u3067\u3082\u5229\u7528\u3067\u304d\u308b\u72b6\u614b\u306e\u518d\u5e30DNS\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3060\u3051\u3067\u306a\u304f\u3001DNS\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u653b\u6483\u306a\u3069\u5225\u306e\u653b\u6483\u306b\u3082\u60aa\u7528\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u3001\u518d\u5e30\u554f\u3044\u5408\u308f\u305b\u3092\u5fc5\u8981\u306a\u5229\u7528\u8005\u3084\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u9650\u5b9a\u3057\u3001\u5916\u90e8\u304b\u3089\u81ea\u7531\u306b\u5229\u7528\u3067\u304d\u306a\u3044\u69cb\u6210\u306b\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p><strong>\u30ed\u30b0\u3068DNS\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u76e3\u8996\u3059\u308b<\/strong><\/p>\n<p>DNS\u30ed\u30b0\u306b\u306f\u3001\u901a\u5e38\u3068\u306f\u7570\u306a\u308b\u5927\u91cf\u306e\u554f\u3044\u5408\u308f\u305b\u3001\u7570\u5e38\u306aNXDOMAIN\u3001\u7279\u5b9a\u30c9\u30e1\u30a4\u30f3\u3078\u306e\u6025\u6fc0\u306a\u30a2\u30af\u30bb\u30b9\u5897\u52a0\u306a\u3069\u3001\u653b\u6483\u3084\u30de\u30eb\u30a6\u30a7\u30a2\u611f\u67d3\u306e\u5146\u5019\u304c\u73fe\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u73fe\u5728\u306eDNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3067\u306f\u3001DNSSEC\u3060\u3051\u306b\u4f9d\u5b58\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30ed\u30b0\u76e3\u8996\u3084\u7570\u5e38\u691c\u77e5\u3001\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u300c\u591a\u5c64\u9632\u5fa1\u300d\u304c\u91cd\u8981\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><!-- notionvc: a0874509-e716-4b8b-8b3a-c551af4333a4 --><\/p>\n<p><!-- notionvc: 6c150678-b04a-401b-a82b-006005cd8558 --><\/p>\n<h2>2026\u5e74\u306eDNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3067\u91cd\u8981\u306a\u8996\u70b9<\/h2>\n<p>2026\u5e743\u6708\u3001NIST\u306f\u300cSP 800-81 Rev.3 Secure Domain Name System (DNS) Deployment Guide\u300d\u3092\u6b63\u5f0f\u516c\u958b\u3057\u307e\u3057\u305f\u30022013\u5e74\u7248\u3092\u7f6e\u304d\u63db\u3048\u308b\u6539\u8a02\u7248\u3067\u3001DNSSEC\u3060\u3051\u3067\u306a\u304f\u3001\u6a29\u5a01DNS\u3001\u518d\u5e30DNS\u3001\u6697\u53f7\u5316DNS\u3001DNS\u30ed\u30b0\u3001\u30bc\u30ed\u30c8\u30e9\u30b9\u30c8\u306a\u3069\u3092\u542b\u3081\u3001DNS\u3092\u7d44\u7e54\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u57fa\u76e4\u3068\u3057\u3066\u6349\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306fDNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u8003\u3048\u65b9\u304c\u3001\u300cDNSSEC\u3092\u5165\u308c\u308b\u304b\u3069\u3046\u304b\u300d\u3068\u3044\u3046\u5358\u4e00\u306e\u6280\u8853\u8ad6\u304b\u3089\u3001DNS\u30a4\u30f3\u30d5\u30e9\u5168\u4f53\u306e\u5b8c\u5168\u6027\u30fb\u53ef\u7528\u6027\u30fb\u6a5f\u5bc6\u6027\u3092\u3069\u3046\u5b88\u308b\u304b\u3068\u3044\u3046\u904b\u7528\u8a2d\u8a08\u3078\u5e83\u304c\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u7279\u306b\u4f01\u696d\u3067\u306f\u3001DNS\u3092\u5358\u306a\u308b\u540d\u524d\u89e3\u6c7a\u30b5\u30fc\u30d3\u30b9\u3068\u3057\u3066\u6271\u3046\u306e\u3067\u306f\u306a\u304f\u3001\u30bc\u30ed\u30c8\u30e9\u30b9\u30c8\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u76e3\u8996\u306e\u4e00\u90e8\u3068\u3057\u3066\u4f4d\u7f6e\u4ed8\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p><!-- 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