{"id":1462,"date":"2026-10-26T15:00:00","date_gmt":"2026-10-26T06:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1462"},"modified":"2026-10-23T15:12:34","modified_gmt":"2026-10-23T06:12:34","slug":"qs-ntp-asymmetric-delay-20261023","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1462","title":{"rendered":"NTP\u306e\u6642\u523b\u5408\u308f\u305b\u3001\u5f80\u5fa9\u6642\u9593\u304c\u540c\u3058\u3067\u3082\u6642\u8a08\u306e\u305a\u308c\u3092\u898b\u8aa4\u308b\u7406\u7531"},"content":{"rendered":"<p>\u4e8c\u53f0\u306e\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u306e\u6642\u8a08\u3092\u5408\u308f\u305b\u308b\u3068\u304d\u3001\u76f8\u624b\u304c\u9001\u3063\u3066\u304d\u305f\u6642\u523b\u3092\u305d\u306e\u307e\u307e\u63a1\u7528\u3059\u308b\u3068\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u5c4a\u304f\u307e\u3067\u306e\u6642\u9593\u3060\u3051\u9045\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002NTP\uff08Network Time Protocol\uff09\u306f\u3001\u8981\u6c42\u3068\u5fdc\u7b54\u306b\u95a2\u308f\u308b\u56db\u3064\u306e\u6642\u523b\u304b\u3089\u3001\u6642\u8a08\u306e\u305a\u308c\u3068\u5f80\u5fa9\u306e\u9045\u5ef6\u3092\u63a8\u5b9a\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5f80\u5fa9\u6642\u9593\u304c\u5206\u304b\u3063\u3066\u3082\u3001\u305d\u306e\u6642\u9593\u304c\u5f80\u8def\u3068\u5fa9\u8def\u306b\u3069\u3046\u5206\u304b\u308c\u3066\u3044\u308b\u304b\u307e\u3067\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u3002\u3053\u3053\u306b\u3001\u63a8\u5b9a\u5024\u3092\u8aad\u3080\u3068\u304d\u306e\u5927\u5207\u306a\u6761\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<section class=\"influvetor-quick-summary\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>NTP\u306e\u57fa\u672c\u8a08\u7b97\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u9001\u4fe1\u30fb\u53d7\u4fe1\u3068\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u53d7\u4fe1\u30fb\u9001\u4fe1\u306e\u56db\u6642\u523b\u3092\u4f7f\u3044\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u5185\u3067\u5fdc\u7b54\u3092\u5f85\u3063\u305f\u6642\u9593\u306f\u3001\u5f80\u5fa9\u9045\u5ef6\u304b\u3089\u5dee\u3057\u5f15\u304d\u307e\u3059\u3002<\/li>\n<li>\u6642\u8a08\u306e\u305a\u308c\u306e\u63a8\u5b9a\u306b\u306f\u3001\u5f80\u8def\u3068\u5fa9\u8def\u306e\u9045\u5ef6\u5dee\u306e\u534a\u5206\u304c\u6df7\u3056\u308a\u307e\u3059\u3002\u5f80\u5fa9\u6642\u9593\u304c\u540c\u3058\u3067\u3082\u3001\u4e8c\u65b9\u5411\u306e\u5185\u8a33\u304c\u5909\u308f\u308b\u3068\u63a8\u5b9a\u304c\u5909\u308f\u308a\u307e\u3059\u3002<\/li>\n<li>\u3053\u308c\u306f\u4e00\u56de\u306e\u4ea4\u63db\u3092\u5207\u308a\u51fa\u3057\u305f\u8aac\u660e\u3067\u3059\u3002\u5b9f\u969b\u306e\u6642\u523b\u540c\u671f\u3067\u306f\u3001\u8907\u6570\u56de\u306e\u89b3\u6e2c\u3084\u6642\u8a08\u306e\u5909\u52d5\u3001\u6642\u523b\u3092\u8a18\u9332\u3059\u308b\u4f4d\u7f6e\u3082\u8003\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u56db\u3064\u306e\u6642\u523b\u3092\u3001\u3069\u3061\u3089\u306e\u6642\u8a08\u304c\u8a18\u9332\u3057\u305f\u304b<\/h2>\n<p>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092A\u3001\u6642\u523b\u3092\u554f\u3044\u5408\u308f\u305b\u308b\u30b5\u30fc\u30d0\u30fc\u3092B\u3068\u3057\u307e\u3059\u3002T1\u306fA\u304c\u8981\u6c42\u3092\u9001\u308b\u6642\u523b\u3001T2\u306fB\u304c\u8981\u6c42\u3092\u53d7\u3051\u53d6\u308b\u6642\u523b\u3001T3\u306fB\u304c\u5fdc\u7b54\u3092\u9001\u308b\u6642\u523b\u3001T4\u306fA\u304c\u5fdc\u7b54\u3092\u53d7\u3051\u53d6\u308b\u6642\u523b\u3067\u3059\u3002T1\u3068T4\u306fA\u306e\u6642\u8a08\u3001T2\u3068T3\u306fB\u306e\u6642\u8a08\u3067\u6e2c\u308a\u307e\u3059\u3002RFC 5905\u306e\u7b2c8\u7bc0\u306f\u3001\u3053\u306e\u56db\u6642\u523b\u3092\u4f7f\u3046\u4ea4\u63db\u3068\u8a08\u7b97\u3092\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002[1]<\/p>\n<p>\u9055\u3046\u6642\u8a08\u306e\u5024\u3092\u5f15\u304f\u3068\u3001\u901a\u4fe1\u6642\u9593\u3060\u3051\u3067\u306a\u304f\u6642\u8a08\u306e\u305a\u308c\u3082\u5165\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u307e\u305a\u540c\u3058\u6642\u8a08\u3067\u6e2c\u3063\u305f\u5dee\u3092\u8003\u3048\u307e\u3059\u3002T4\u2212T1\u306fA\u304c\u5f80\u5fa9\u3092\u5f85\u3063\u305f\u6642\u9593\u3001T3\u2212T2\u306fB\u304c\u53d7\u4fe1\u3057\u3066\u304b\u3089\u5fdc\u7b54\u3092\u9001\u308b\u307e\u3067\u306e\u6642\u9593\u3067\u3059\u3002\u305d\u306e\u5dee\u3092\u53d6\u308c\u3070\u3001B\u306e\u4e2d\u3067\u5f85\u3063\u305f\u5206\u3092\u9664\u3051\u307e\u3059\u3002<\/p>\n<p><strong>\u5f80\u5fa9\u9045\u5ef6\u306e\u63a8\u5b9a \u03b4 = (T4 \u2212 T1) \u2212 (T3 \u2212 T2)<\/strong><\/p>\n<p>\u4e00\u65b9\u3001B\u306e\u6642\u8a08\u304cA\u3088\u308a\u3069\u308c\u3060\u3051\u9032\u3093\u3067\u3044\u308b\u304b\u3092\u8868\u3059\u30aa\u30d5\u30bb\u30c3\u30c8\u306e\u63a8\u5b9a\u306f\u3001\u6b21\u306e\u5f0f\u3067\u3059\u3002\u30d7\u30e9\u30b9\u306a\u3089B\u304c\u9032\u3093\u3067\u3044\u308b\u5411\u304d\u3067\u3059\u3002[1]<\/p>\n<p><strong>\u30aa\u30d5\u30bb\u30c3\u30c8\u306e\u63a8\u5b9a \u03b8\u0302 = ((T2 \u2212 T1) + (T3 \u2212 T4)) \u00f7 2<\/strong><\/p>\n<p>\u3053\u3053\u3067\u306f\u03b8\u0302\u306e\u5370\u3067\u300c\u63a8\u5b9a\u3057\u305f\u305a\u308c\u300d\u3092\u793a\u3057\u3001\u8aac\u660e\u306e\u305f\u3081\u306b\u8a2d\u5b9a\u3059\u308b\u771f\u306e\u305a\u308c\u03b8\u3068\u533a\u5225\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u4e00\u56de\u306e\u4ea4\u63db\u306e\u9593\u306f\u4e8c\u53f0\u306e\u6642\u8a08\u304c\u540c\u3058\u901f\u3055\u3067\u9032\u307f\u3001\u9014\u4e2d\u306e\u6642\u523b\u4fee\u6b63\u3082\u306a\u304f\u3001\u6642\u523b\u306e\u8a18\u9332\u306b\u4e38\u3081\u3084\u63fa\u3089\u304e\u304c\u306a\u3044\u7406\u60f3\u5316\u3057\u305f\u30e2\u30c7\u30eb\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<h2>\u5f80\u8def\u3068\u5fa9\u8def\u3092\u5225\u3005\u306b\u66f8\u304f\u3068\u3001\u8aa4\u5dee\u306e\u6b63\u4f53\u304c\u898b\u3048\u308b<\/h2>\n<p>\u5f80\u8def\u306e\u9045\u5ef6\u3092f\u3001\u5fa9\u8def\u306e\u9045\u5ef6\u3092r\u3068\u7f6e\u304d\u307e\u3059\u3002B\u304cA\u3088\u308a\u03b8\u3060\u3051\u9032\u3093\u3067\u3044\u308c\u3070\u3001T2\u2212T1\u306f\u300c\u5f80\u8deff\uff0b\u6642\u8a08\u306e\u305a\u308c\u03b8\u300d\u3067\u3059\u3002T3\u2212T4\u306f\u3001B\u306e\u9001\u4fe1\u5f8c\u306b\u5fa9\u8defr\u304c\u7d4c\u904e\u3057\u3066A\u304c\u53d7\u3051\u53d6\u308b\u306e\u3067\u300c\u6642\u8a08\u306e\u305a\u308c\u03b8\u2212\u5fa9\u8defr\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u5148\u307b\u3069\u306e\u63a8\u5b9a\u5f0f\u306b\u5165\u308c\u308b\u3068\u3001<strong>\u03b8\u0302 = \u03b8 + (f \u2212 r) \u00f7 2<\/strong>\u3067\u3059\u3002\u5f80\u8def\u3068\u5fa9\u8def\u304c\u540c\u3058\u306a\u3089\u5f8c\u534a\u304c\u30bc\u30ed\u306b\u306a\u308a\u307e\u3059\u3002\u5f80\u8def\u306e\u307b\u3046\u304c\u9577\u3051\u308c\u3070B\u304c\u3088\u308a\u9032\u3093\u3067\u3044\u308b\u3088\u3046\u306b\u3001\u5fa9\u8def\u306e\u307b\u3046\u304c\u9577\u3051\u308c\u3070B\u304c\u3088\u308a\u9045\u308c\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u3002\u3053\u306e\u5f0f\u306f\u56db\u6642\u523b\u306e\u5b9a\u7fa9\u304b\u3089\u3001\u3053\u306e\u30e2\u30c7\u30eb\u306e\u6761\u4ef6\u306e\u4e0b\u3067\u5c0e\u3044\u305f\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u30b5\u30fc\u30d0\u30fc\u5185\u3067\u306e\u5f85\u3061\u6642\u9593\u3092\u5dee\u3057\u5f15\u304f\u3053\u3068\u3068\u3001\u4e8c\u65b9\u5411\u306e\u9045\u5ef6\u5dee\u3092\u77e5\u308b\u3053\u3068\u306f\u5225\u3067\u3059\u3002T3\u2212T2\u304c\u6b63\u78ba\u306b\u5206\u304b\u3063\u3066\u3082\u3001\u305d\u308c\u3060\u3051\u3067\u306ff\u3068r\u306e\u5dee\u3092\u53d6\u308a\u51fa\u305b\u307e\u305b\u3093\u3002RFC 7679\u3082\u3001\u884c\u304d\u5e30\u308a\u304c\u7570\u306a\u308b\u7d4c\u8def\u3092\u901a\u308b\u5834\u5408\u306b\u52a0\u3048\u3001\u7d4c\u8def\u304c\u5bfe\u79f0\u3067\u3082\u30ad\u30e5\u30fc\u3067\u306e\u5f85\u3061\u6642\u9593\u304c\u975e\u5bfe\u79f0\u306b\u306a\u308a\u5f97\u308b\u3053\u3068\u3092\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002[2]<\/p>\n<h2>\u5f80\u5fa940\u30df\u30ea\u79d2\u306e\u4e8c\u3064\u306e\u30b1\u30fc\u30b9<\/h2>\n<p>\u5177\u4f53\u7684\u306b\u3001B\u306e\u6642\u8a08\u304cA\u3088\u308a5\u30df\u30ea\u79d2\u9032\u307f\u3001B\u304c\u8981\u6c42\u3092\u53d7\u3051\u3066\u304b\u3089\u5fdc\u7b54\u3092\u9001\u308b\u307e\u30672\u30df\u30ea\u79d2\u5f85\u3064\u5834\u5408\u3092\u4f5c\u308a\u307e\u3059\u3002A\u304c\u9001\u3063\u305f\u77ac\u9593\u3092T1\uff1d0\u3068\u3057\u3001\u4ee5\u4e0b\u306f\u3059\u3079\u3066\u540c\u3058\u57fa\u6e96\u4ed8\u8fd1\u306e\u30df\u30ea\u79d2\u8868\u793a\u3067\u3059\u3002\u5b9f\u969b\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u6e2c\u3063\u305f\u5024\u3067\u306f\u306a\u304f\u3001\u5f0f\u306e\u610f\u5473\u3092\u898b\u308b\u305f\u3081\u306b\u9078\u3093\u3060\u5165\u529b\u3067\u3059\u3002<\/p>\n<p>\u30b1\u30fc\u30b9A\u306f\u5f80\u8def20\u3001\u5fa9\u8def20\u3067\u3059\u3002\u8981\u6c42\u304c\u5c4a\u3044\u305f\u3068\u304d\u3001A\u57fa\u6e96\u3067\u306f20\u304c\u7d4c\u904e\u3057\u3001B\u306e\u6642\u8a08\u306b\u306f\u3055\u3089\u306b5\u306e\u305a\u308c\u304c\u3042\u308b\u306e\u3067T2\uff1d25\u30022\u5f85\u3063\u3066T3\uff1d27\u3001\u5fdc\u7b54\u304cA\u3078\u5c4a\u304f\u306e\u306fT4\uff1d42\u3067\u3059\u3002\u03b4\uff1d42\u22122\uff1d40\u3001\u03b8\u0302\uff1d(25\uff0b27\u221242)\u00f72\uff1d5\u3068\u306a\u308a\u3001\u8a2d\u5b9a\u3057\u305f\u771f\u306e\u305a\u308c\u3068\u4e00\u81f4\u3057\u307e\u3059\u3002<\/p>\n<p>\u30b1\u30fc\u30b9B\u306f\u5f80\u8def12\u3001\u5fa9\u8def28\u306b\u5909\u3048\u307e\u3059\u3002\u6642\u8a08\u306e\u771f\u306e\u305a\u308c\u3068\u30b5\u30fc\u30d0\u30fc\u5185\u306e\u5f85\u3061\u306f\u305d\u306e\u307e\u307e\u3067\u3059\u3002T2\uff1d17\u3001T3\uff1d19\u3001T4\uff1d42\u306b\u306a\u308b\u306e\u3067\u3001\u5f80\u5fa9\u9045\u5ef6\u306f\u3084\u306f\u308a40\u3067\u3059\u3002\u3057\u304b\u3057\u03b8\u0302\uff1d(17\uff0b19\u221242)\u00f72\uff1d\u22123\u3002\u5b9f\u969b\u306b\u306fB\u304c5\u9032\u3093\u3067\u3044\u308b\u306e\u306b\u3001\u63a8\u5b9a\u306f3\u9045\u308c\u3066\u3044\u308b\u5411\u304d\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u8aa4\u5dee\u306f\u22128\u3067\u3001(12\u221228)\u00f72\u3068\u4e00\u81f4\u3057\u307e\u3059\u3002<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-ntp-asymmetric-delay-20261023-figure-d05cd125d9a3.png\" alt=\"\u6642\u8a08\u306e\u771f\u306e\u305a\u308c\u306f\u3069\u3061\u3089\u3082\u30d7\u30e9\u30b95\u30df\u30ea\u79d2\u3002\u5f80\u8def\u3068\u5fa9\u8def20\u30fb20\u306a\u3089\u63a8\u5b9a\u30d7\u30e9\u30b95\u300112\u30fb28\u306a\u3089\u63a8\u5b9a\u30de\u30a4\u30ca\u30b93\u3002\u5f80\u5fa9\u9045\u5ef6\u306f\u3068\u3082\u306b40\u30df\u30ea\u79d2\u3002\" style=\"display:block;width:100%;height:auto;max-width:1200px;margin:auto\"><figcaption>\u8aac\u660e\u7528\u306e\u5165\u529b\u304b\u3089\u72ec\u81ea\u306b\u8a08\u7b97\u3057\u305f\u6bd4\u8f03\u3002\u5358\u4f4d\u306f\u30df\u30ea\u79d2\u3002\u30b5\u30fc\u30d0\u30fc\u306e\u771f\u306e\u305a\u308c\uff0b5\u3001\u5fdc\u7b54\u5f85\u30612\u306f\u5171\u901a\u3067\u3001\u5f80\u8def\u30fb\u5fa9\u8def\u306e\u5185\u8a33\u3060\u3051\u3092\u5909\u66f4\u3057\u3066\u3044\u307e\u3059\u3002\u5b9f\u6a5f\u3084\u56de\u7dda\u306e\u6e2c\u5b9a\u7d50\u679c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/figcaption><\/figure>\n<h2>\u540c\u3058\u56db\u6642\u523b\u304b\u3089\u3001\u9055\u3046\u72b6\u6cc1\u3092\u8aac\u660e\u3067\u304d\u3066\u3057\u307e\u3046<\/h2>\n<p>\u3055\u3089\u306b\u3001\u30b1\u30fc\u30b9B\u3067\u5f97\u305f\u56db\u6642\u523b\u300c0\u300117\u300119\u300142\u300d\u3060\u3051\u3092\u6e21\u3055\u308c\u305f\u5834\u9762\u3092\u8003\u3048\u307e\u3059\u3002\u5b9f\u306f\u3001\u3053\u306e\u56db\u3064\u306f\u3001\u5f80\u8def20\u30fb\u5fa9\u8def20\u3067\u3001B\u306e\u6642\u8a08\u304cA\u3088\u308a3\u9045\u308c\u3066\u3044\u308b\u5834\u5408\u306b\u3082\u5f97\u3089\u308c\u307e\u3059\u300220\u22123\uff1d17\u3001\u305d\u3053\u304b\u30892\u5f85\u3063\u306619\u3001\u5f80\u5fa9\u3092\u7d42\u3048\u308b\u306842\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u300c\u672c\u5f53\u306f\uff0b5\u3060\u304c\u7d4c\u8def\u304c\u975e\u5bfe\u79f0\u300d\u3068\u300c\u672c\u5f53\u306f\u22123\u3067\u7d4c\u8def\u304c\u5bfe\u79f0\u300d\u304c\u3001\u540c\u3058\u89b3\u6e2c\u3092\u4f5c\u308a\u307e\u3059\u3002\u8a08\u7b97\u306e\u6841\u6570\u3092\u5897\u3084\u3057\u3066\u3082\u3001\u3053\u306e\u4e8c\u3064\u3092\u56db\u6642\u523b\u3060\u3051\u3067\u533a\u5225\u3067\u304d\u308b\u3088\u3046\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u6642\u523b\u60c5\u5831\u306e\u7cbe\u5bc6\u3055\u3068\u3001\u672a\u77e5\u306e\u9045\u5ef6\u3092\u5206\u96e2\u3067\u304d\u308b\u3053\u3068\u306f\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u7406\u60f3\u30e2\u30c7\u30eb\u3067f\u3068r\u304c\u3068\u3082\u306b\u30bc\u30ed\u4ee5\u4e0a\u3068\u5206\u304b\u308b\u3060\u3051\u306a\u3089\u3001\u03b4\uff1df\uff0br\u306b\u5bfe\u3057\u3066\u3001\u975e\u5bfe\u79f0\u6027\u306b\u3088\u308b\u8aa4\u5dee\u306e\u7d76\u5bfe\u5024\u306f\u6700\u5927\u03b4\u00f72\u3067\u3059\u3002\u03b4\uff1d40\u306a\u3089\u3001\u03b8\u0302\uff1d\u22123\u3092\u4e2d\u5fc3\u3068\u3057\u3066\u771f\u306e\u03b8\u306f\u221223\u304b\u3089\uff0b17\u307e\u3067\u53d6\u308a\u5f97\u307e\u3059\u3002\u3053\u308c\u306f\u30e2\u30c7\u30eb\u304b\u3089\u5c0e\u3044\u305f\u53ef\u80fd\u7bc4\u56f2\u3067\u3042\u308a\u3001\u5b9f\u6e2c\u30c7\u30fc\u30bf\u306b\u5bfe\u3059\u308b\u4fe1\u983c\u533a\u9593\u3067\u3082\u3001NTP\u88fd\u54c1\u306e\u7cbe\u5ea6\u4fdd\u8a3c\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u6642\u8a08\u306e\u63fa\u3089\u304e\u3084\u8a18\u9332\u8aa4\u5dee\u3092\u52a0\u3048\u308b\u3068\u3001\u5225\u306e\u4e0d\u78ba\u304b\u3055\u3082\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u540c\u671f\u7d50\u679c\u3092\u6bd4\u8f03\u3059\u308b\u3068\u304d\u306b\u3001\u4f55\u3092\u4e00\u7dd2\u306b\u898b\u308b\u304b<\/h2>\n<p>\u307e\u305a\u3001\u5f80\u5fa9\u9045\u5ef6\u3068\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u5225\u306e\u91cf\u3068\u3057\u3066\u8aad\u307f\u307e\u3059\u3002\u300c\u5f80\u5fa9\u304c40\u3060\u304b\u3089\u7247\u9053\u306f\u5fc5\u305a20\u300d\u300c\u305a\u308c\u306e\u8868\u793a\u304c\u22123\u3060\u304b\u3089\u771f\u306e\u5dee\u3082\u22123\u300d\u3068\u8aad\u307f\u66ff\u3048\u308b\u3068\u3001\u4e0a\u306e\u4e8c\u30b1\u30fc\u30b9\u3092\u53d6\u308a\u9055\u3048\u307e\u3059\u3002\u77ed\u3044\u5f80\u5fa9\u9045\u5ef6\u306f\u3001\u3053\u306e\u7406\u60f3\u30e2\u30c7\u30eb\u3067\u975e\u5bfe\u79f0\u6027\u304c\u4f5c\u308c\u308b\u8aa4\u5dee\u306e\u5e45\u3092\u72ed\u3081\u307e\u3059\u304c\u3001\u5e45\u306e\u4e2d\u306e\u3069\u3053\u304c\u771f\u5024\u304b\u307e\u3067\u306f\u6559\u3048\u3066\u304f\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u6b21\u306b\u3001\u540c\u3058\u6761\u4ef6\u3067\u4f55\u56de\u3082\u6e2c\u3063\u305f\u3068\u304d\u306e\u63fa\u308c\u3068\u3001\u4e00\u5b9a\u3057\u3066\u6b8b\u308b\u504f\u308a\u3092\u5206\u3051\u307e\u3059\u3002\u8aac\u660e\u7528\u30e2\u30c7\u30eb\u3067\u6bce\u56def\uff1d12\u3001r\uff1d28\u306a\u3089\u3001\u4f55\u56de\u5e73\u5747\u3057\u3066\u3082\u3053\u306e\u90e8\u5206\u306e\u504f\u308a\u22128\u306f\u6d88\u3048\u307e\u305b\u3093\u3002\u5b9f\u969b\u306eNTP\u306b\u306f\u89b3\u6e2c\u3092\u9078\u5225\u3059\u308b\u30d5\u30a3\u30eb\u30bf\u30fc\u306a\u3069\u304c\u3042\u308a\u3001\u3053\u306e\u4e00\u56de\u306e\u5f0f\u3060\u3051\u3067\u540c\u671f\u51e6\u7406\u5168\u4f53\u3092\u8868\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002[1]<\/p>\n<p>\u6700\u5f8c\u306b\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u3069\u3053\u3067\u8a18\u9332\u3057\u305f\u304b\u3082\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u6642\u523b\u3092\u8aad\u3080\u77ac\u9593\u3068\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u30d1\u30b1\u30c3\u30c8\u304c\u901a\u308b\u77ac\u9593\u306b\u306f\u5dee\u304c\u3042\u308a\u5f97\u307e\u3059\u3002RFC 7679\u306f\u3001\u6642\u8a08\u3069\u3046\u3057\u306e\u540c\u671f\u8aa4\u5dee\u3068\u3001\u30db\u30b9\u30c8\u5074\u306e\u6642\u523b\u3068\u56de\u7dda\u4e0a\u306e\u6642\u523b\u306e\u9055\u3044\u3092\u5206\u3051\u3066\u4e0d\u78ba\u304b\u3055\u3068\u3057\u3066\u6271\u3063\u3066\u3044\u307e\u3059\u3002[2]<\/p>\n<p>\u3053\u306e\u305f\u3081\u3001\u7570\u306a\u308b\u6a5f\u5668\u3084\u65b9\u5f0f\u306e\u300c\u540c\u671f\u7cbe\u5ea6\u300d\u3092\u6bd4\u3079\u308b\u306a\u3089\u3001\u89b3\u6e2c\u671f\u9593\u3001\u6642\u8a08\u306e\u57fa\u6e96\u3001\u6642\u523b\u3092\u8a18\u9332\u3059\u308b\u4f4d\u7f6e\u3001\u7d4c\u8def\u306e\u5bfe\u79f0\u6027\u306b\u7f6e\u3044\u305f\u6761\u4ef6\u304c\u305d\u308d\u3063\u3066\u3044\u308b\u304b\u304c\u5224\u65ad\u6750\u6599\u306b\u306a\u308a\u307e\u3059\u3002\u56db\u6642\u523b\u306e\u5f0f\u306f\u3001\u305d\u306e\u6761\u4ef6\u3092\u6574\u7406\u3059\u308b\u51fa\u767a\u70b9\u3067\u3059\u3002\u51fa\u3066\u304d\u305f\u6570\u5024\u3060\u3051\u3067\u306a\u304f\u3001\u305d\u306e\u6570\u5024\u306b\u3069\u3093\u306a\u9045\u5ef6\u5dee\u304c\u6df7\u3056\u308a\u5f97\u308b\u304b\u307e\u3067\u8aad\u3081\u308b\u3068\u3001\u6642\u523b\u5408\u308f\u305b\u306e\u7d50\u679c\u3092\u3088\u308a\u6b63\u78ba\u306b\u89e3\u91c8\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u51fa\u5178<\/h2>\n<p>[1] RFC 5905, <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc5905.html\">Network Time Protocol Version 4: Protocol and Algorithms Specification<\/a>\uff082010\u5e746\u6708\u3001\u7b2c8\u7bc0\u30fb\u56f315\u3001\u7b2c10\u7bc0\uff09\u3002\u3053\u3053\u3067\u306f2010\u5e74\u7248\u306e\u57fa\u672c\u8a08\u7b97\u3092\u53c2\u7167\u3002\u5f8c\u7d9a\u66f4\u65b0\u3092\u542b\u3080\u5b9f\u88c5\u5168\u4f53\u306e\u89e3\u8aac\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>[2] RFC 7679, <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc7679.html\">A One-Way Delay Metric for IP Performance Metrics (IPPM)<\/a>\uff082016\u5e741\u6708\u3001\u7b2c1.1\u7bc0\u3001\u7b2c2\u7bc0\u3001\u7b2c3.7.1\u20133.7.2\u7bc0\uff09\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e8c\u53f0\u306e\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u306e\u6642\u8a08\u3092\u5408\u308f\u305b\u308b\u3068\u304d\u3001\u76f8\u624b\u304c\u9001\u3063\u3066\u304d\u305f\u6642\u523b\u3092\u305d\u306e\u307e\u307e\u63a1\u7528\u3059\u308b\u3068\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u5c4a\u304f\u307e\u3067\u306e\u6642\u9593\u3060\u3051\u9045\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002NTP\uff08Network Time Protocol\uff09\u306f\u3001\u8981\u6c42\u3068\u5fdc\u7b54\u306b\u95a2\u308f\u308b\u56db\u3064\u306e\u6642\u523b\u304b\u3089 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1460,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[29],"tags":[290],"class_list":["post-1462","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-communications-networking","tag-ntp"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-ntp-asymmetric-delay-20261023-featured-7b3744c5e6f1.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1462","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1462"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1462\/revisions"}],"predecessor-version":[{"id":1463,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1462\/revisions\/1463"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1460"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1462"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}