{"id":19649,"date":"2026-06-03T15:03:10","date_gmt":"2026-06-03T13:03:10","guid":{"rendered":"https:\/\/webhosting.de\/dns-resolver-redundanz-hochverfuegbarkeit-hosting-failsafe\/"},"modified":"2026-06-03T15:03:10","modified_gmt":"2026-06-03T13:03:10","slug":"dns%e3%83%aa%e3%82%be%e3%83%ab%e3%83%90-%e5%86%97%e9%95%b7%e6%80%a7-%e9%ab%98%e5%8f%af%e7%94%a8%e6%80%a7-%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0-%e3%83%95%e3%82%a7%e3%82%a4%e3%83%ab","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/dns-resolver-redundanz-hochverfuegbarkeit-hosting-failsafe\/","title":{"rendered":"\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3051\u308bDNS\u30ea\u30be\u30eb\u30d0\u306e\u5197\u9577\u6027\u3068\u9ad8\u53ef\u7528\u6027"},"content":{"rendered":"<p>DNS\u30ea\u30be\u30eb\u30d0\u306e\u5197\u9577\u6027\u306b\u3088\u308a\u3001\u30b5\u30fc\u30d0\u30fc\u3084\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u3067\u3082\u3001\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3067\u540d\u524d\u89e3\u6c7a\u3092\u5229\u7528\u3067\u304d\u307e\u3059\uff1b; <strong>DNS\u30ea\u30c0\u30f3\u30c0\u30f3\u30b7\u30fc<\/strong> \u3068\u9ad8\u53ef\u7528\u6027\u306f\u3001\u5225\u3005\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3001\u5834\u6240\u3001\u81ea\u52d5\u30be\u30fc\u30f3\u8ee2\u9001\u3092\u4ecb\u3057\u3066\u3001\u8907\u6570\u306e\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3068\u30ea\u30be\u30eb\u30d0\u3092\u30ea\u30f3\u30af\u3057\u307e\u3059\u3002\u500b\u3005\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u969c\u5bb3\u304c\u767a\u751f\u3057\u3066\u3082\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3001API\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u30b5\u30fc\u30d3\u30b9\u304c\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u306a\u72b6\u614b\u3092\u7dad\u6301\u3057\u3001\u4ed6\u306e\u30b7\u30b9\u30c6\u30e0\u304c\u30a8\u30e9\u30fc\u306a\u304f\u52d5\u4f5c\u3057\u7d9a\u3051\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<ul>\n  <li><strong>\u8907\u6570\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc<\/strong> \u5225\u3005\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3068\u5834\u6240\u3067<\/li>\n  <li><strong>\u30af\u30ea\u30fc\u30f3\u4ee3\u8868\u56e3<\/strong> \u304a\u3088\u3073\u5b89\u5168\u306a\u30be\u30fc\u30f3\u8ee2\u9001<\/li>\n  <li><strong>\u30ea\u30be\u30eb\u30d0\u306e\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc<\/strong> \u77ed\u3044\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3068\u4e00\u8cab\u3057\u305f\u30ec\u30b9\u30dd\u30f3\u30b9<\/li>\n  <li><strong>\u30b8\u30aa\u30fb\u30ea\u30c0\u30f3\u30c0\u30f3\u30b7\u30fc<\/strong> \u4f4e\u9045\u5ef6\u306e\u305f\u3081\u306e\u30a8\u30cb\u30fc\u30ad\u30e3\u30b9\u30c8<\/li>\n  <li><strong>\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/strong>, DNSSEC\u3068\u660e\u78ba\u306a\u6587\u66f8\u5316<\/li>\n<\/ul>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/dns_resolver_hosting_8723.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3051\u308bDNS\u30ea\u30be\u30eb\u30d0\u306e\u5197\u9577\u6027\u304c\u91cd\u8981\u306a\u7406\u7531<\/h2>\n\n<p>\u3082\u3057 <strong>\u540d\u524d\u89e3\u6c7a<\/strong> 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<strong>\u30c9\u30e1\u30a4\u30f3<\/strong> \u304c\u30cd\u30ac\u30c6\u30a3\u30d6\u30b7\u30b0\u30ca\u30eb\u3092\u8a98\u767a\u3057\u3001DNS\u30d1\u30b9\u7d4c\u7531\u306e\u30ed\u30fc\u30c9\u6642\u9593\u304c\u9577\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002.<\/p>\n\n<h2>\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3068\u30ea\u30be\u30eb\u30d0\u3092\u660e\u78ba\u306b\u5206\u96e2\u3059\u308b<\/h2>\n\n<p>\u79c1\u306f\u53b3\u5bc6\u306b\u533a\u5225\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u53b3\u7136<\/strong> 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<strong>\u30b0\u30eb\u30fc\u30ec\u30b3\u30fc\u30c9<\/strong> (A\/AAAA)\u304c\u30be\u30fc\u30f3\u5185\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306b\u5b58\u5728\u3059\u308b\u3002\u6709\u52b9\u306a\u30b0\u30eb\u30fc\u304c\u306a\u3044\u3068\u3001\u30ea\u30be\u30eb\u30d0\u306f\u5468\u671f\u7684\u306b\u30cf\u30f3\u30b0\u3057\u305f\u308a\u3001\u5916\u90e8\u30bd\u30fc\u30b9\u306b\u4f9d\u5b58\u3057\u305f\u308a\u3059\u308b\u3002\u30c7\u30e5\u30a2\u30eb\u30b9\u30bf\u30c3\u30af\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306b\u306f <strong>IPv4\u3068IPv6-Glue<\/strong> 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<strong>\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc<\/strong> 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<strong>\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3<\/strong> \u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u4e2d\u3084\u6545\u969c\u4e2d\u3067\u3042\u3063\u3066\u3082\u3002.<\/p>\n\n<h2>\u30be\u30fc\u30f3\u306b\u304a\u3051\u308b\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3068\u5909\u66f4\u898f\u5f8b<\/h2>\n<p>\u79c1\u306f\u900f\u660e\u306a\u3082\u306e\u3092\u4f7f\u3063\u3066\u3044\u308b\u3002 <strong>SOA\u30b7\u30ea\u30a2\u30eb\u6226\u7565<\/strong> (\u65e5\u4ed8\u5f62\u5f0f\u306a\u3069)\u3092\u5909\u66f4\u3057\u3001\u30a2\u30c8\u30df\u30c3\u30af\u306b\u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u3057\u307e\u3057\u305f\u3002\u95a2\u9023\u30ec\u30b3\u30fc\u30c9(A\/AAA\u3001MX\u3001TXT\u3001SPF)\u3092\u4e00\u5ea6\u306b\u5909\u66f4\u3057\u307e\u3057\u305f\u3002. <strong>\u901a\u77e5<\/strong> 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<strong>\u30e6\u30fc\u30b6\u30fc\u30fb\u30b8\u30e3\u30fc\u30cb\u30fc<\/strong> \u30b5\u30fc\u30d0\u30fc\u306b\u969c\u5bb3\u304c\u767a\u751f\u3057\u305f\u308a\u3001\u8ca0\u8377\u306e\u30d4\u30fc\u30af\u304c\u767a\u751f\u3057\u305f\u308a\u3057\u3066\u3082\u3001\u30b9\u30e0\u30fc\u30ba\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/dns-resolver-high-availability-7498.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u52d5\u4f5c\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30fb\u30d7\u30ed\u30d3\u30b8\u30e7\u30cb\u30f3\u30b0\u3092\u7406\u89e3\u3059\u308b<\/h2>\n<p>\u79c1\u306f\u3001\u305d\u306e\u3053\u3068\u3092\u8003\u616e\u306b\u5165\u308c\u3066\u3044\u308b\u3002 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<a href=\"https:\/\/webhosting.de\/ja\/%e4%bd%8e%e9%81%85%e5%bb%b6%e3%83%ab%e3%83%bc%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%82%92%e3%83%9b%e3%82%b9%e3%83%88%e3%81%99%e3%82%8bdns%e3%83%aa%e3%82%be%e3%83%ab%e3%83%90%e3%83%bb%e3%82%a8\/\">\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3051\u308b\u30a8\u30cb\u30fc\u30ad\u30e3\u30b9\u30c8\u30fb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af<\/a>. .\u3053\u306e\u30b8\u30aa\u30fb\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u3001\u30a8\u30cb\u30fc\u30ad\u30e3\u30b9\u30c8\u3001\u30af\u30ea\u30fc\u30f3\u30fb\u30c7\u30ea\u30b2\u30fc\u30b7\u30e7\u30f3\u306e\u9023\u9396\u3067\u3001\u79c1\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u9078\u624b\u3092\u5897\u3084\u3057\u3066\u3044\u308b\u3002 <strong>\u30ec\u30b8\u30ea\u30a8\u30f3\u30b9<\/strong> 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\u201c\u306b\u5207\u308a\u66ff\u3048\u308b\u30d7\u30ec\u30a4\u30d6\u30c3\u30af\u3092\u6e96\u5099\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u30a8\u30cb\u30fc\u30ad\u30e3\u30b9\u30c8\u306f\u5358\u306a\u308b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u30c8\u30ea\u30c3\u30af\u4ee5\u4e0a\u306e\u3082\u306e\u3067\u3042\u308a\u3001\u56de\u5fa9\u529b\u306e\u3042\u308b\u904b\u7528\u898f\u5f8b\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>\u4ee3\u8868\u7684\u306a\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u6bd4\u8f03<\/h2>\n\n<p>\u79c1\u306f\u6b21\u306e\u3088\u3046\u306b\u5efa\u7bc9\u3092\u9078\u3093\u3067\u3044\u308b\u3002 <strong>\u5fc5\u8981\u6761\u4ef6<\/strong>, \u4e88\u7b97\u3068\u30c1\u30fc\u30e0\u306e\u5c02\u9580\u77e5\u8b58\u53e4\u5178\u7684\u306a\u30de\u30b9\u30bf\u30fc\u30fb\u30b9\u30ec\u30fc\u30d6\u30fb\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306f\u3001\u826f\u3044\u30b9\u30bf\u30fc\u30c8\u3092\u63d0\u4f9b\u3057\u3001\u5236\u5fa1\u3055\u308c\u305f\u65b9\u6cd5\u3067\u64cd\u4f5c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30de\u30eb\u30c1\u30fb\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u30fb\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u969c\u5bb3\u306b\u5bfe\u3059\u308b\u8ffd\u52a0\u7684\u306a\u4fdd\u8b77\u3092\u63d0\u4f9b\u3057\u307e\u3059\u304c\u3001\u30af\u30ea\u30fc\u30f3\u306a\u540c\u671f\u304c\u5fc5\u8981\u3067\u3059\u3002\u30a8\u30cb\u30fc\u30ad\u30e3\u30b9\u30c8\u30fb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306f\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc\u3068DDoS\u914d\u4fe1\u306e\u70b9\u3067\u512a\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u614e\u91cd\u306a\u8a08\u753b\u3068\u76e3\u8996\u304c\u5fc5\u8981\u3067\u3059\u3002\u6b21\u306e\u8868\u306f\u3001\u4e00\u822c\u7684\u306a\u30d0\u30ea\u30a2\u30f3\u30c8\u306e\u30b3\u30a2\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u793a\u3057\u3066\u304a\u308a\u3001DDoS\u5bfe\u7b56\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 <strong>\u5206\u985e<\/strong>:<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u5efa\u7bc9<\/th>\n      <th>\u7a7a\u5ba4\u72b6\u6cc1<\/th>\n      <th>\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc<\/th>\n      <th>\u55b6\u696d\u8cbb\u7528<\/th>\n      <th>\u4ee3\u8868\u7684\u306a\u4f7f\u7528\u4f8b<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u4e3b\u5f93\u95a2\u4fc2<\/td>\n      <td>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff0f\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u5206\u304b\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u9ad8\u3044<\/td>\n      <td>\u5834\u6240\u306b\u3088\u3063\u3066\u306f\u826f\u597d<\/td>\n      <td>\u4f4e\uff5e\u4e2d<\/td>\n      <td>\u4e2d\u5c0f\u898f\u6a21\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30de\u30eb\u30c1\u30d7\u30ed\u30d0\u30a4\u30c0DNS<\/td>\n      <td>\u826f\u597d\u306a\u30b7\u30f3\u30af\u30ed\u3067\u975e\u5e38\u306b\u9ad8\u3044<\/td>\n      <td>\u826f\u3044\uff5e\u975e\u5e38\u306b\u826f\u3044<\/td>\n      <td>\u4e2d\uff5e\u9ad8<\/td>\n      <td>\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u30fb\u30c9\u30e1\u30a4\u30f3\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306e\u72ec\u7acb\u6027<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30a8\u30cb\u30fc\u30ad\u30e3\u30b9\u30c8DNS<\/td>\n      <td>\u30ce\u30fc\u30c9\u5206\u5e03\u306e\u305f\u3081\u975e\u5e38\u306b\u9ad8\u3044<\/td>\n      <td>\u975e\u5e38\u306b\u826f\u3044\uff08\u6b21\u306e\u30ce\u30fc\u30c9\uff09<\/td>\n      <td>\u8cc7\u91d1\uff08\u8a08\u753b\uff0f\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u304c\u5fc5\u8981\uff09<\/td>\n      <td>\u30b0\u30ed\u30fc\u30d0\u30eb\u30fb\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3001e\u30b3\u30de\u30fc\u30b9\u3001SaaS<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/dns_resolver_redundanz_7823.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u5730\u5e73\u7dda\u3068\u5185\u90e8\u30be\u30fc\u30f3\u306e\u5206\u5272<\/h2>\n<p>\u5185\u90e8\u3068\u5916\u90e8\u306e\u53cd\u5fdc\u304c\u7570\u306a\u308b\u5834\u5408\u3001\u79c1\u306f\u6b21\u306e\u3088\u3046\u306b\u4f7f\u3046\u3002 <strong>\u30b9\u30d7\u30ea\u30c3\u30c8\u30fb\u30db\u30e9\u30a4\u30ba\u30f3<\/strong> (\u30d3\u30e5\u30fc\uff09\u307e\u305f\u306f\u6761\u4ef6\u4ed8\u304d\u8ee2\u9001\u3092\u4f7f\u7528\u3059\u308b\u3002\u4e00\u8cab\u6027\u306f\u91cd\u8981\u3067\u3042\u308b\u3002\u5916\u90e8\u540d\u524d\u7a7a\u9593\u306f\u72ec\u7acb\u3057\u3066\u6a5f\u80fd\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3057\u3001\u5185\u90e8\u306e\u8ffd\u52a0\u60c5\u5831\u306f\u6a5f\u5bc6\u60c5\u5831\u3092\u5916\u90e8\u306b\u6f0f\u3089\u3057\u3066\u306f\u306a\u3089\u306a\u3044\u3002\u79c1\u306f\u3001\u3069\u306e\u30ea\u30be\u30eb\u30d0\u304c\u3069\u306e\u30d3\u30e5\u30fc\u3092\u6301\u3064\u304b\u3092\u6587\u66f8\u5316\u3057\u3001\u5916\u90e8\u306e\u8996\u70b9\u304b\u3089\u5b9a\u671f\u7684\u306b\u30c6\u30b9\u30c8\u3059\u308b\u3053\u3068\u3067\u3001\u5076\u767a\u7684\u306a\u6f0f\u6d29\u3092\u9632\u3044\u3067\u3044\u308b\u3002\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u30fb\u30af\u30e9\u30a6\u30c9\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306e\u5834\u5408\u306f\u3001\u5185\u90e8\u306e\u30af\u30a8\u30ea\u304c\u610f\u56f3\u305b\u305a\u306b\u30d1\u30d6\u30ea\u30c3\u30af\u30fb\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u5230\u9054\u3057\u306a\u3044\u3088\u3046\u306b\u3001\u660e\u78ba\u306a\u8cac\u4efb\u3092\u5b9a\u7fa9\u3059\u308b\u3002.<\/p>\n\n<h2>TTL\u6226\u7565\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u4e00\u8cab\u6027<\/h2>\n\n<p>\u3092\u30bb\u30c3\u30c8\u3057\u305f\u3002 <strong>TTL<\/strong>-TTL\u304c\u77ed\u3059\u304e\u308b\u3068\u8ca0\u8377\u304c\u5897\u3057\u3001\u9577\u3059\u304e\u308b\u3068\u5909\u66f4\u304c\u9045\u304f\u306a\u308b\u3002\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc\u3084MX\u306e\u3088\u3046\u306a\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u30a8\u30f3\u30c8\u30ea\u30fc\u306b\u3064\u3044\u3066\u306f\u3001\u9069\u5ea6\u306a\u5024\u3092\u9078\u3073\u3001\u8a08\u753b\u7684\u306a\u79fb\u52d5\u306e\u524d\u306b\u9650\u3089\u308c\u305f\u671f\u9593\u3060\u3051\u4e0b\u3052\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3002SOA\u30b7\u30ea\u30a2\u30eb\u3067\u5909\u66f4\u3092\u30af\u30ea\u30fc\u30f3\u306b\u5c55\u958b\u3057\u3001\u30bb\u30ab\u30f3\u30c0\u30ea\u30b5\u30fc\u30d0\u30fc\u3092\u6ce8\u610f\u6df1\u304f\u76e3\u8996\u3059\u308b\u3053\u3068\u3067\u3001\u30ea\u30be\u30eb\u30d0\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u4e00\u8cab\u6027\u3092\u4fdd\u3063\u3066\u3044\u307e\u3059\u3002TTL\u3001\u30ea\u30be\u30eb\u30d0\u306e\u52d5\u4f5c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u95a2\u3059\u308b\u80cc\u666f\u60c5\u5831\u3092\u304a\u63a2\u3057\u306e\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u30b5\u30a4\u30c8\u3067\u5b9f\u8df5\u7684\u306a\u77e5\u8b58\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/dns%e3%82%a2%e3%83%bc%e3%82%ad%e3%83%86%e3%82%af%e3%83%81%e3%83%a3-%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0-%e3%83%aa%e3%82%be%e3%83%ab%e3%83%90-ttl%e3%83%91%e3%83%95%e3%82%a9%e3%83%bc\/\">\u30ec\u30be\u30eb\u30d0\u3001TTL\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/a>. .\u3053\u306e\u3088\u3046\u306a\u898f\u5f8b\u306b\u3088\u3063\u3066\u3001\u56de\u7b54\u304c\u8fc5\u901f\u306b\u5c4a\u304f\u3088\u3046\u306b\u306a\u308b\u3002 <strong>\u30e6\u30fc\u30b6\u30fc\u30fb\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9<\/strong> \u82e6\u3057\u3093\u3067\u3044\u306a\u3044\u3002.<\/p>\n\n<h2>\u30b9\u30c6\u30fc\u30eb\u30fb\u30b5\u30fc\u30d3\u30f3\u30b0\u3001\u30cd\u30ac\u30c6\u30a3\u30d6\u30fb\u30ad\u30e3\u30c3\u30b7\u30f3\u30b0\u3001\u30d7\u30ea\u30d5\u30a7\u30c3\u30c1<\/h2>\n<p>\u5197\u9577\u6027\u306f\u3001\u77ed\u671f\u7684\u306a\u6545\u969c\u306e\u969b\u306b\u30ec\u30be\u30eb\u30d0\u304c\u4f7f\u7528\u3055\u308c\u308b\u5834\u5408\u306b\u3001\u3088\u308a\u5805\u7262\u306b\u306a\u308b\u3002 <strong>\u30b9\u30bf\u30eb\u30a2\u30f3\u30b5\u30fc<\/strong> \u306f\u914d\u4fe1\u304c\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u3002\u79c1\u306fserve-stale\u3092\u6ce8\u610f\u6df1\u304f\u8a2d\u5b9a\u3057\u3001\u30bf\u30a4\u30e0\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u5236\u9650\u3057\u3001\u30a8\u30e9\u30fc\u304c\u96a0\u853d\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u76e3\u8996\u3068\u95a2\u9023\u4ed8\u3051\u308b\u3002\u30cd\u30ac\u30c6\u30a3\u30d6\u30fb\u30ad\u30e3\u30c3\u30b7\u30e5\uff08NXDOMAIN\/NODATA\uff09\u306f\u3001\u30cd\u30ac\u30c6\u30a3\u30d6TTL\u306eSOA\u4ed5\u69d8\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\u3002\u8a2d\u5b9a\u30df\u30b9\u304c\u4e0d\u5fc5\u8981\u306b\u5b9a\u7740\u3057\u306a\u3044\u3088\u3046\u3001\u3053\u3053\u3067\u306f\u9069\u5ea6\u306a\u5024\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u304a\u6c17\u306b\u5165\u308a\u306e\u30ec\u30b3\u30fc\u30c9 <strong>\u30d7\u30ea\u30d5\u30a7\u30c3\u30c1\u30a7<\/strong> \u30db\u30c3\u30c8\u30d1\u30b9\u3092\u9ad8\u901f\u306b\u4fdd\u3064\u305f\u3081\u306b\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u843d\u3061\u308b\u524d\u306b\u306d\u3002\u3053\u308c\u306f\u3059\u3079\u3066\u3001\u30c7\u30fc\u30bf\u30bd\u30fc\u30b9\uff08\u6a29\u5a01\u30b5\u30fc\u30d0\u30fc\uff09\u304c\u5b89\u5b9a\u3057\u3066\u4e00\u8cab\u6027\u304c\u3042\u308b\u5834\u5408\u306b\u306e\u307f\u6a5f\u80fd\u3059\u308b\u3002.<\/p>\n\n<h2>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff1aDNSSEC\u3001\u30be\u30fc\u30f3\u8ee2\u9001\u3001\u30cf\u30fc\u30c9\u30cb\u30f3\u30b0<\/h2>\n\n<p>\u3067\u7b54\u3048\u306e\u5b8c\u5168\u6027\u3092\u9ad8\u3081\u3066\u3044\u308b\u3002 <strong>\u30c7\u30a3\u30ca\u30bb\u30c3\u30af<\/strong>, \u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3068\u30c9\u30e1\u30a4\u30f3\u8a2d\u5b9a\u304c\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u9650\u308a\u3002\u30be\u30fc\u30f3\u8ee2\u9001\u3092\u65e2\u77e5\u306eIP\u306b\u5236\u9650\u3057\u3001TSIG\u3092\u4f7f\u7528\u3057\u3066\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3057\u3001\u7121\u8a31\u53ef\u306e\u30c7\u30fc\u30bf\u76d7\u8074\u3092\u9632\u6b62\u3057\u3066\u3044\u307e\u3059\u3002\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u5e38\u306b\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3061\u3001\u30aa\u30fc\u30d7\u30f3\u30ea\u30be\u30eb\u30d0\u306e\u30ea\u30b9\u30af\u3092\u6e1b\u3089\u3057\u3001\u653b\u6483\u3092\u793a\u3059\u507d\u30d1\u30bf\u30fc\u30f3\u3092\u76e3\u8996\u3059\u308b\u3002\u30ec\u30fc\u30c8\u5236\u9650\u3068\u30ec\u30b9\u30dd\u30f3\u30b9\u30dd\u30ea\u30b7\u30fc\u306f\u3001\u6b63\u5f53\u306a\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306b\u6df1\u523b\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3053\u3068\u306a\u304f\u3001\u4e0d\u6b63\u306a\u30d1\u30bf\u30fc\u30f3\u3092\u6291\u5236\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u5bfe\u7b56\u306f\u5197\u9577\u6027\u3068\u9023\u52d5\u3057\u3066\u3044\u308b\u3002 <strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/strong>-\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u9a5a\u304d\u3092\u96a0\u305b\u306a\u3044\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/06\/dnsresolver_desk_6572.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30c7\u30fc\u30bf\u4fdd\u8b77\u3001\u30ed\u30ae\u30f3\u30b0\u3001\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9<\/h2>\n<p>\u79c1\u306f\u3001DNS\u30af\u30a8\u30ea\u3092\u6b21\u306e\u3088\u3046\u306b\u8a18\u9332\u3057\u3066\u3044\u308b\u3002 <strong>\u30a8\u30e9\u30fc\u5206\u6790<\/strong> \u53ef\u80fd\u3060\u304c\u3001\u500b\u4eba\u30c7\u30fc\u30bf\u306f\u4fdd\u8b77\u3055\u308c\u308b\uff1a\u4fdd\u5b58\u306e\u5236\u9650\u3001\u9069\u5207\u306a\u5834\u5408\u306f\u4eee\u540d\u5316\u3001\u53b3\u683c\u306a\u30a2\u30af\u30bb\u30b9\u6a29\u3002\u6a5f\u5bc6\u6027\u306e\u9ad8\u3044\u74b0\u5883\u3067\u306f\u3001\u79c1\u306f\u30ea\u30be\u30eb\u30d0\u306b\u4ee5\u4e0b\u306e\u3082\u306e\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002 <strong>DoT\/DoH<\/strong> \u8f38\u9001\u30ec\u30d9\u30eb\u3067\u3042\u308b\u304c\u3001\u904b\u7528\u9762\uff08\u8a3c\u660e\u66f8\u3001\u30d4\u30f3\u7559\u3081\u3001\u76e3\u8996\uff09\u3082\u8003\u616e\u3057\u3066\u3044\u308b\u3002. <em>QNAME\u6700\u5c0f\u5316<\/em> \u3068\u30cf\u30fc\u30c9ACL\u306b\u3088\u308a\u3001\u4e0d\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u9732\u51fa\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u79c1\u306e\u6587\u66f8\u306b\u306f\u3001\u3069\u306e\u30ed\u30b0\u304c\u4f55\u306e\u305f\u3081\u306b\u5fc5\u8981\u3067\u3001\u3044\u3064\u524a\u9664\u3055\u308c\u305f\u304b\u304c\u8a18\u9332\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u306f\u30d6\u30ec\u30fc\u30ad\u30d1\u30c3\u30c9\u3067\u306f\u306a\u304f\u3001\u4fe1\u983c\u3067\u304d\u308b\u904b\u7528\u306e\u4e00\u90e8\u306a\u306e\u3067\u3059\u3002.<\/p>\n\n<h2>\u9699\u9593\u306e\u306a\u3044\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3001\u30c6\u30b9\u30c8\u3001SLA<\/h2>\n\n<p>\u79c1\u306f\u3001\u3059\u3079\u3066\u306e <strong>\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc<\/strong> \u53ef\u7528\u6027\u3001\u5fdc\u7b54\u6642\u9593\u3001\u30a8\u30e9\u30fc\u7387\u3001\u305d\u3057\u3066\u30a2\u30e9\u30fc\u30e0\u3092\u30a8\u30b9\u30ab\u30ec\u30fc\u30b7\u30e7\u30f3\u30fb\u30c1\u30a7\u30fc\u30f3\u306b\u30ea\u30f3\u30af\u3055\u305b\u308b\u3002\u8907\u6570\u306e\u5730\u57df\u304b\u3089\u306e\u7dcf\u5408\u7684\u306a\u30c1\u30a7\u30c3\u30af\u306b\u3088\u308a\u3001\u3042\u308b\u62e0\u70b9\u304c\u5f31\u4f53\u5316\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u304c\u65e9\u3044\u6bb5\u968e\u3067\u308f\u304b\u308a\u307e\u3059\u3002\u5b9a\u671f\u7684\u306b\u8ca0\u8377\u30c6\u30b9\u30c8\u3068\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc\u30c6\u30b9\u30c8\u3092\u5b9f\u65bd\u3057\u3001\u53ef\u7528\u6027\u3068\u5fdc\u7b54\u6642\u9593\u306b\u95a2\u3059\u308bSLA\u304c\u5b9f\u8cea\u7684\u306a\u3082\u306e\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002\u5909\u66f4\u304c\u3042\u3063\u305f\u5834\u5408\u306f\u3001\u30c7\u30ea\u30b2\u30fc\u30b7\u30e7\u30f3\u3001SOA\u30b7\u30ea\u30a2\u30eb\u3001\u30be\u30fc\u30f3\u8ee2\u9001\u3001\u30ec\u30b9\u30dd\u30f3\u30b9\u30eb\u30fc\u30c8\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u77db\u76fe\u3092\u5373\u5ea7\u306b\u691c\u51fa\u3057\u307e\u3059\u3002\u3053\u3046\u3057\u3066\u79c1\u306f <strong>\u30b5\u30fc\u30d3\u30b9\u306e\u8cea<\/strong> \u6e2c\u5b9a\u53ef\u80fd\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u524d\u306b\u554f\u984c\u3092\u963b\u6b62\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/p>\n\n<h2>SLO\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3001\u30a8\u30e9\u30fc\u30d0\u30b8\u30a7\u30c3\u30c8<\/h2>\n<p>\u79c1\u306f\u3053\u3046\u5b9a\u7fa9\u3059\u308b <strong>SLI<\/strong> \u6210\u529f\u7387\uff08\u4f8b\u3048\u3070NXDOMAIN\u3092\u9664\u304f\uff09\u3001p50\/p90\/p99\u306e\u30ec\u30a4\u30c6\u30f3\u30b7\u30fc\u3001\u304a\u3088\u3073\u8ca0\u8377\u3068\u306e\u76f8\u95a2\u306b\u3064\u3044\u3066\u3002. <strong>SLO<\/strong> \u30a8\u30e9\u30fc\u4e88\u7b97\u306f\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306b\u3069\u308c\u3060\u3051\u306e\u4f59\u88d5\u304c\u6b8b\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u3002. <em>\u71c3\u713c\u7387<\/em>-\u30a2\u30e9\u30fc\u30c8\u306f\u3001\u969c\u5bb3\u304c\u4e88\u7b97\u3092\u6025\u901f\u306b\u6d88\u8cbb\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u8a8d\u8b58\u3057\u307e\u3059\u3002\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u306f\u6a29\u5a01\u30d1\u30b9\u3068\u518d\u5e30\u30d1\u30b9\u3092\u6bd4\u8f03\u3057\u3001\u554f\u984c\u304c\u30ea\u30be\u30eb\u30d0\u306b\u3042\u308b\u306e\u304b\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30eb\u30fc\u30c8\u306b\u3042\u308b\u306e\u304b\u3001\u6a29\u5a01\u30b5\u30fc\u30d0\u306b\u3042\u308b\u306e\u304b\u3092\u8a8d\u8b58\u3067\u304d\u308b\u3002\u3053\u306e\u900f\u660e\u6027\u304c\u4fe1\u983c\u3067\u304d\u308bSLA\u306e\u57fa\u790e\u3068\u306a\u308b\u3002.<\/p>\n\n<h2>\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u74b0\u5883\u3078\u306e\u7d71\u5408<\/h2>\n\n<p>DNS\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d1\u30b9\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u304c\u30d5\u30a7\u30a4\u30eb\u30bb\u30fc\u30d5\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306b\u306e\u307f\u6a5f\u80fd\u3057\u307e\u3059\u3002 <strong>\u30a8\u30f3\u30c9\u30fb\u30c4\u30fc\u30fb\u30a8\u30f3\u30c9<\/strong>. .\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc\u3001\u30af\u30e9\u30b9\u30bf\u30fc\u30ec\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3001\u5225\u3005\u306e\u30eb\u30fc\u30bf\u30fc\u30d1\u30b9\u306f\u3001\u5358\u4e00\u969c\u5bb3\u70b9\u3092\u6e1b\u3089\u3057\u3001DNS\u306e\u4fdd\u8b77\u3092\u88dc\u3044\u307e\u3059\u3002\u79c1\u306f\u3001\u5909\u66f4\u304c\u9023\u9396\u53cd\u5fdc\u3092\u5f15\u304d\u8d77\u3053\u3055\u306a\u3044\u3088\u3046\u306b\u3001\u3059\u3079\u3066\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u6587\u66f8\u5316\u3057\u3066\u3044\u307e\u3059\u3002\u30ea\u30be\u30eb\u30d0\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u9069\u5207\u306a\u5bf8\u6cd5\u3067\u3042\u308c\u3070\u3001\u9ad8\u8ca0\u8377\u4e0b\u3067\u3082\u52d5\u4f5c\u53ef\u80fd\u3067\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/dns%e3%83%aa%e3%82%be%e3%83%ab%e3%83%90%e8%b2%a0%e8%8d%b7%e5%87%a6%e7%90%86%e9%ab%98%e6%9c%80%e5%be%8c%e3%81%ae%e3%82%ad%e3%83%a3%e3%83%83%e3%82%b7%e3%83%a5%e3%83%96%e3%83%bc%e3%82%b9%e3%83%88\/\">\u30ec\u30be\u30eb\u30d0\u3078\u306e\u8ca0\u8377\u5206\u6563<\/a>. .\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001DNS\u306f\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u78ba\u5b9f\u306b\u3001\u540c\u3058\u30b5\u30fc\u30d3\u30b9\u3067\u3042\u308b <strong>\u5165\u624b\u6027\u304c\u9ad8\u3044<\/strong> 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<strong>\u30e6\u30fc\u30b6\u30fc\u6e80\u8db3\u5ea6<\/strong> \u305d\u3057\u3066\u8996\u8a8d\u6027\u3002.<\/p>\n\n<h2>\u9a5a\u304d\u306e\u306a\u3044\u96fb\u5b50\u30e1\u30fc\u30eb\u7279\u6709\u306e\u5074\u9762<\/h2>\n<p>\u96fb\u5b50\u30e1\u30fc\u30eb\u306f\u7279\u306b\u30c7\u30ea\u30b1\u30fc\u30c8\u3060\u3002 <strong>MX\u30d5\u30a7\u30a4\u30eb\u30aa\u30fc\u30d0\u30fc<\/strong> \u5225\u3005\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff0f\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u7d4c\u7531\u3057\u3001\u8ca0\u8377\u304c\u9069\u5207\u306b\u5206\u6563\u3055\u308c\u308b\u3088\u3046\u306b\u512a\u5148\u9806\u4f4d\u3092\u8a2d\u5b9a\u3059\u308b\u3002SPF\u30ec\u30b3\u30fc\u30c9\u306f\u3059\u3079\u3066\u306e\u9001\u4fe1\u30b7\u30b9\u30c6\u30e0\u3068\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u3092\u8003\u616e\u306b\u5165\u308c\u3066\u3044\u308b\u3002\u79c1\u306f\u4e8b\u524d\u306bTTL\u3092\u4e0b\u3052\u3066\u5909\u66f4\u3092\u30c6\u30b9\u30c8\u3057\u3066\u3044\u308b\u3002. 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