{"id":1957,"date":"2024-02-29T09:03:02","date_gmt":"2024-02-29T00:03:02","guid":{"rendered":"http:\/\/daimaru-tech-blog.com\/?p=1897"},"modified":"2025-07-05T12:11:58","modified_gmt":"2025-07-05T03:11:58","slug":"%e3%80%90%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e5%85%a5%e9%96%80%e3%80%91%e6%99%82%e5%88%bb%e5%90%8c%e6%9c%9f%e3%81%ab%e5%bf%85%e9%a0%88%e3%81%ae%e3%83%97%e3%83%ad%e3%83%88%e3%82%b3","status":"publish","type":"post","link":"https:\/\/daimaru-tech-blog.com\/?p=1957","title":{"rendered":"\u3010\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5165\u9580\u3011\u6642\u523b\u540c\u671f\u306b\u5fc5\u9808\u306e\u30d7\u30ed\u30c8\u30b3\u30ebNTP\u306b\u3064\u3044\u3066"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u306f\u3058\u3081\u306b<\/h2>\n\n\n\n<p>\u3053\u3093\u306b\u3061\u306f\u3002<strong><span class=\"swl-inline-color has-swl-deep-02-color\"><span class=\"swl-marker 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data-has-cell-bg=\"1\" data-text-color=\"white\"><strong><span style=\"--the-cell-bg: #0000ff\" data-text-color=\"white\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span><span class=\"swl-inline-color has-white-color\">\u9805\u76ee<\/span><\/strong><\/td><td data-has-cell-bg=\"1\" data-text-color=\"white\"><span style=\"--the-cell-bg: #0000ff\" data-text-color=\"white\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u6642\u523b\u540c\u671f<\/td><td data-has-cell-bg=\"1\" data-text-color=\"white\">\u6642\u523b\u8981\u6c42<span style=\"--the-cell-bg: #0000ff\" data-text-color=\"white\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span><\/td><td data-has-cell-bg=\"1\" data-text-color=\"white\"><span style=\"--the-cell-bg: #0000ff\" data-text-color=\"white\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u5236\u5fa1\u30af\u30a8\u30ea<\/td><\/tr><tr><td data-has-cell-bg=\"1\" data-text-color=\"black\"><strong><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>peer<\/strong><\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u25ef<\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u25ef<\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u25ef<\/td><\/tr><tr><td data-has-cell-bg=\"1\" data-text-color=\"black\"><strong><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>serve<\/strong><\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><strong><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span><\/strong>\u2716\ufe0f<\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u25ef<\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u25ef<\/td><\/tr><tr><td data-has-cell-bg=\"1\" data-text-color=\"black\"><strong><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>peer-only<\/strong><\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u2716\ufe0f<\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u25ef<\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u2716\ufe0f<\/td><\/tr><tr><td data-has-cell-bg=\"1\" data-text-color=\"black\"><strong>serve-only<\/strong><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span><\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u2716\ufe0f<\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u2716\ufe0f<\/td><td data-has-cell-bg=\"1\" data-text-color=\"black\"><span style=\"--the-cell-bg: #fffacd\" data-text-color=\"black\" aria-hidden=\"true\" class=\"swl-cell-bg\">&nbsp;<\/span>\u25ef<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<center> <div style=\"width:728px; height:290px;border:solid 1.5px gray;\">\n        <div style=\"float:left;width:34%;margin: 0% 0.5% 0% 0%;\">\n            <figure>\n                <img decoding=\"async\" width=\"220px\" height=\"200px\" src=\"https:\/\/m.media-amazon.com\/images\/I\/61sjSeQ+yPL._SY522_.jpg\" alt=\"\" style=\"border:solid 1px black\"\/>\n            <\/figure>\n        <\/div>\n        <div style=\"float:right;width:60%;margin: 0% 0% 0% 1.5%;\">\n            <br>\n            <div style=\"width:90%;text-align:left;margin:15% auto 2% 2%;\">\n                <a href=\"https:\/\/amzn.to\/3UOn1sV\" target=\"_blank\" style=\"color:black;font-size:14pt;\" rel=\"noopener\">NTP Security: A Quick-Start Guide<\/a>\n            <\/div>\n            <br>\n            <div style=\"width:90%;margin:3% auto 2% 2%;text-align:center;padding-left:3%;padding-right:3%;padding-top:1%;padding-bottom:1%;background:#ff8c00;border-radius: 8px;\">\n                <a href=\"https:\/\/amzn.to\/3UOn1sV\" target=\"_blank\" style=\"color:white;font-size:14pt;text-decoration: none;\" rel=\"noopener\">Amazon\u3067\u307f\u308b<\/a>\n            <\/div>\n        <\/div>\n    <\/div><\/center>\n\n\n\n<h3 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mark_green\">RTT\u306f\u3001\u51e6\u7406\u6642\u9593\u3092\u9664\u304f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30fb\u30b5\u30fc\u30d0\u9593\u3067\u767a\u751f\u3057\u305f\u901a\u4fe1\u6642\u9593\u3092\u6c42\u3081\u3066\u3044\u308b\u306e\u3067\u7406\u89e3\u306f\u5bb9\u6613<\/span><\/span><\/strong>\u3060\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6642\u523b\u5dee\u306f\u3001\u5c11\u3057\u7406\u89e3\u304c\u5384\u4ecb\u3067\u3059\u304c\u3001\u3053\u3061\u3089\u306e\u30b5\u30a4\u30c8\u304c\u308f\u304b\u308a\u3084\u3059\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-postLink\">https:\/\/zenn.dev\/mtmatma\/articles\/429a715dffbc65<\/div>\n\n\n<center><a href=\"https:\/\/px.a8.net\/svt\/ejp?a8mat=3YYD8O+37I44Y+3IB8+60WN5\" rel=\"nofollow\">\n<img decoding=\"async\" border=\"0\" width=\"728\" height=\"90\" alt=\"\" src=\"https:\/\/www28.a8.net\/svt\/bgt?aid=240108936194&#038;wid=001&#038;eno=01&#038;mid=s00000016370001012000&#038;mc=1\"><\/a>\n<img decoding=\"async\" border=\"0\" width=\"1\" height=\"1\" src=\"https:\/\/www15.a8.net\/0.gif?a8mat=3YYD8O+37I44Y+3IB8+60WN5\" alt=\"\"><\/center>\n\n\n\n<h2 class=\"wp-block-heading\">Cisco IOS\u306e\u57fa\u672c\u8a2d\u5b9a\u3068\u5b9f\u6a5f\u78ba\u8a8d<\/h2>\n\n\n\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001Cisco IOS\u306e NTP\u306e\u8a2d\u5b9a\u65b9\u6cd5\u3068\u5b9f\u6a5f\u78ba\u8a8d\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u7528\u3044\u305f\u69cb\u6210\u306f\u3001Stratum\u50243\u306e\u30eb\u30fc\u30bf\uff08NTP\u30b5\u30fc\u30d0\u6a21\u64ec\uff09\u3092\uff12\u53f0\u3001Stratum\u50244\u306e\u30eb\u30fc\u30bf\uff08NTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u6a21\u64ec\uff09\u3092\uff11\u53f0\u306e\u4e09\u89d2\u5f62\u69cb\u6210\u3068\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<div class=\"wp-block-group has-border -border03\"><div class=\"wp-block-group__inner-container is-layout-constrained 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pointer-events=\"stroke\"\/><path d=\"M 130 323 L 890 323\" fill=\"none\" stroke=\"rgb(0, 0, 0)\" stroke-width=\"3\" stroke-miterlimit=\"10\" stroke-dasharray=\"3 6\" pointer-events=\"stroke\"\/><path d=\"M 280.25 141 L 456.25 290\" fill=\"none\" stroke=\"rgb(0, 0, 0)\" stroke-width=\"2\" stroke-miterlimit=\"10\" pointer-events=\"stroke\"\/><rect x=\"246.5\" y=\"70\" width=\"120\" height=\"60\" fill=\"#3333ff\" stroke=\"#3333ff\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 100px; margin-left: 248px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 20px;\" color=\"#ffffff\">Router1<\/font><\/div><\/div><\/div><\/foreignObject><text x=\"307\" y=\"104\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Router1<\/text><\/switch><\/g><rect x=\"432.5\" y=\"300\" width=\"120\" height=\"60\" fill=\"#009900\" stroke=\"#009900\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 330px; margin-left: 434px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 20px;\" color=\"#ffffff\">Router2<\/font><\/div><\/div><\/div><\/foreignObject><text x=\"493\" y=\"334\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Router2<\/text><\/switch><\/g><rect x=\"622.5\" y=\"70\" width=\"120\" height=\"60\" fill=\"#3333ff\" stroke=\"#3333ff\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 100px; margin-left: 624px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 20px;\" color=\"#ffffff\">Router3<\/font><\/div><\/div><\/div><\/foreignObject><text x=\"683\" y=\"104\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Router3<\/text><\/switch><\/g><path d=\"M 397.5 120 L 590 120\" fill=\"none\" stroke=\"rgb(0, 0, 0)\" stroke-width=\"2\" stroke-miterlimit=\"10\" pointer-events=\"stroke\"\/><path d=\"M 523.75 290 L 682.5 141\" fill=\"none\" stroke=\"rgb(0, 0, 0)\" stroke-width=\"2\" stroke-miterlimit=\"10\" pointer-events=\"stroke\"\/><rect x=\"0\" y=\"310\" width=\"110\" height=\"30\" fill=\"none\" stroke=\"none\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 108px; height: 1px; padding-top: 325px; margin-left: 1px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 18px;\">Stratum 4<\/font><\/div><\/div><\/div><\/foreignObject><text x=\"55\" y=\"329\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Stratum 4<\/text><\/switch><\/g><rect x=\"410\" y=\"360\" width=\"165\" height=\"30\" fill=\"none\" stroke=\"none\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 163px; height: 1px; padding-top: 375px; margin-left: 411px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 18px;\">NTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8<\/font><\/div><\/div><\/div><\/foreignObject><text x=\"493\" y=\"379\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">NTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8<\/text><\/switch><\/g><rect x=\"224\" y=\"40\" width=\"165\" height=\"30\" fill=\"none\" stroke=\"none\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 163px; height: 1px; padding-top: 55px; margin-left: 225px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 18px;\">NTP\u30b5\u30fc\u30d0<\/font><\/div><\/div><\/div><\/foreignObject><text x=\"307\" y=\"59\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">NTP\u30b5\u30fc\u30d0<\/text><\/switch><\/g><rect x=\"70\" y=\"0\" width=\"165\" height=\"70\" fill=\"none\" stroke=\"none\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-start; width: 163px; height: 1px; padding-top: 7px; margin-left: 72px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: left;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 15px;\">Lo 0:10.0.1.1<br \/>Gi0\/1\uff1a192.168.1.1\/29<br \/>Gi0\/2\uff1a192.168.3.1\/30<br \/><\/font><\/div><\/div><\/div><\/foreignObject><text x=\"72\" y=\"19\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\">Lo 0:10.0.1.1&#8230;<\/text><\/switch><\/g><rect x=\"256.5\" y=\"121\" width=\"47.5\" height=\"20\" fill=\"#b3b3b3\" stroke=\"#808080\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 46px; height: 1px; padding-top: 131px; margin-left: 258px;\"><div data-drawio-colors=\"color: #333333; \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(51, 51, 51); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\">Gi0\/1<\/div><\/div><\/div><\/foreignObject><text x=\"280\" y=\"135\" fill=\"#333333\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Gi0\/1<\/text><\/switch><\/g><rect x=\"350\" y=\"110\" width=\"47.5\" height=\"20\" fill=\"#b3b3b3\" stroke=\"#808080\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 46px; height: 1px; padding-top: 120px; margin-left: 351px;\"><div data-drawio-colors=\"color: #333333; \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(51, 51, 51); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\">Gi0\/2<\/div><\/div><\/div><\/foreignObject><text x=\"374\" y=\"124\" fill=\"#333333\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Gi0\/2<\/text><\/switch><\/g><rect x=\"432.5\" y=\"290\" width=\"47.5\" height=\"20\" fill=\"#b3b3b3\" stroke=\"#808080\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 46px; height: 1px; padding-top: 300px; margin-left: 434px;\"><div data-drawio-colors=\"color: #333333; \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(51, 51, 51); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\">Gi0\/1<\/div><\/div><\/div><\/foreignObject><text x=\"456\" y=\"304\" fill=\"#333333\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Gi0\/1<\/text><\/switch><\/g><rect x=\"590\" y=\"110\" width=\"47.5\" height=\"20\" fill=\"#b3b3b3\" stroke=\"#808080\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 46px; height: 1px; padding-top: 120px; margin-left: 591px;\"><div data-drawio-colors=\"color: #333333; \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(51, 51, 51); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\">Gi0\/2<\/div><\/div><\/div><\/foreignObject><text x=\"614\" y=\"124\" fill=\"#333333\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Gi0\/2<\/text><\/switch><\/g><rect x=\"0\" y=\"85\" width=\"110\" height=\"30\" fill=\"none\" stroke=\"none\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 108px; height: 1px; padding-top: 100px; margin-left: 1px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 18px;\">Stratum 3<\/font><\/div><\/div><\/div><\/foreignObject><text x=\"55\" y=\"104\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Stratum 3<\/text><\/switch><\/g><rect x=\"500\" y=\"290\" width=\"47.5\" height=\"20\" fill=\"#b3b3b3\" stroke=\"#808080\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 46px; height: 1px; padding-top: 300px; margin-left: 501px;\"><div data-drawio-colors=\"color: #333333; \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(51, 51, 51); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\">Gi0\/3<\/div><\/div><\/div><\/foreignObject><text x=\"524\" y=\"304\" fill=\"#333333\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Gi0\/3<\/text><\/switch><\/g><rect x=\"658.75\" y=\"121\" width=\"47.5\" height=\"20\" fill=\"#b3b3b3\" stroke=\"#808080\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 46px; height: 1px; padding-top: 131px; margin-left: 660px;\"><div data-drawio-colors=\"color: #333333; \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(51, 51, 51); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\">Gi0\/3<\/div><\/div><\/div><\/foreignObject><text x=\"683\" y=\"135\" fill=\"#333333\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">Gi0\/3<\/text><\/switch><\/g><rect x=\"420\" y=\"390\" width=\"165\" height=\"70\" fill=\"none\" stroke=\"none\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-start; width: 163px; height: 1px; padding-top: 397px; margin-left: 422px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: left;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 15px;\">Lo 0:10.0.1.2<br \/>Gi0\/1\uff1a192.168.1.2\/29<br \/>Gi0\/3\uff1a192.168.2.1\/30<br \/><\/font><\/div><\/div><\/div><\/foreignObject><text x=\"422\" y=\"409\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\">Lo 0:10.0.1.2&#8230;<\/text><\/switch><\/g><rect x=\"760\" y=\"0\" width=\"165\" height=\"70\" fill=\"none\" stroke=\"none\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-start; width: 163px; height: 1px; padding-top: 7px; margin-left: 762px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: left;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 15px;\">Lo 0:10.0.1.3<br \/>Gi0\/2\uff1a192.168.3.2\/30<br \/>Gi0\/3\uff1a192.168.2.2\/30<br \/><\/font><\/div><\/div><\/div><\/foreignObject><text x=\"762\" y=\"19\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\">Lo 0:10.0.1.3&#8230;<\/text><\/switch><\/g><rect x=\"595\" y=\"30\" width=\"165\" height=\"30\" fill=\"none\" stroke=\"none\" pointer-events=\"all\"\/><g transform=\"translate(-0.5 -0.5)\"><switch><foreignObject pointer-events=\"none\" width=\"100%\" height=\"100%\" requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\" style=\"overflow: visible; text-align: left;\"><div xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" style=\"display: flex; align-items: unsafe center; justify-content: unsafe center; width: 163px; height: 1px; padding-top: 45px; margin-left: 596px;\"><div data-drawio-colors=\"color: rgb(0, 0, 0); \" style=\"box-sizing: border-box; font-size: 0px; text-align: center;\"><div style=\"display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;\"><font style=\"font-size: 18px;\">NTP\u30b5\u30fc\u30d0<\/font><\/div><\/div><\/div><\/foreignObject><text x=\"678\" y=\"49\" fill=\"rgb(0, 0, 0)\" font-family=\"Helvetica\" font-size=\"12px\" text-anchor=\"middle\">NTP\u30b5\u30fc\u30d0<\/text><\/switch><\/g><\/g><switch><g requiredFeatures=\"http:\/\/www.w3.org\/TR\/SVG11\/feature#Extensibility\"\/><a transform=\"translate(0,-5)\" xlink:href=\"https:\/\/www.drawio.com\/doc\/faq\/svg-export-text-problems\" target=\"_blank\" rel=\"noopener\"><text text-anchor=\"middle\" font-size=\"10px\" x=\"50%\" y=\"100%\">Text is not SVG &#8211; cannot display<\/text><\/a><\/switch><\/svg><\/center>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u8a2d\u5b9a\uff08\u30b3\u30de\u30f3\u30c9\uff09\u3068\u5b9f\u6a5f\u78ba\u8a8d<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">NTP\u30b5\u30fc\u30d0\u306e\u5b9a\u7fa9<\/h4>\n\n\n\n<p>\u4ee5\u4e0b\u30b3\u30de\u30f3\u30c9\u3067<strong><span style=\"color:#008000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_green\">NTP\u30b5\u30fc\u30d0\u306e\u6307\u5b9a<\/span><\/span><\/strong>\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>(config)# ntp master &lt;\u30b9\u30c8\u30e9\u30bf\u30e0\u5024&gt;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">NTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30b5\u30fc\u30d0\u306e\u6307\u5b9a<\/h4>\n\n\n\n<p><strong><span style=\"color:#008000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_green\">NTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u3088\u308b\u30b5\u30fc\u30d0\u306e\u6307\u5b9a<\/span><\/span><\/strong>\u306f\u3001\u57fa\u672c\u7684\u306b\u4ee5\u4e0b\u30b3\u30de\u30f3\u30c9\u3067\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>(config)# ntp server &#91; \u30b5\u30fc\u30d0 IP\u30a2\u30c9\u30ec\u30b9 | \u30b5\u30fc\u30d0 \u30db\u30b9\u30c8\u540d ] <\/code><\/pre>\n\n\n\n<p>\u4e0a\u8a18\u30b3\u30de\u30f3\u30c9\u306f\u30b5\u30fc\u30d0\u306e\u968e\u5c64\u304c\u4e0a\u4f4d\u306e\u5834\u5408\u306b\u5229\u7528\u3057\u3001<strong><span style=\"color:#008000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_green\">\u540c\u4e00\u968e\u5c64\u306e\u30b5\u30fc\u30d0\u540c\u58eb\u3067\u540c\u671f\u3057\u305f\u3044\u5834\u5408\u306f\u4ee5\u4e0b\u30b3\u30de\u30f3\u30c9<\/span><\/span><\/strong>\u3067\u3092\u5229\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>(config)# ntp peer &#91;\u30b5\u30fc\u30d0 IP\u30a2\u30c9\u30ec\u30b9]<\/code><\/pre>\n\n\n\n<center><a href=\"https:\/\/px.a8.net\/svt\/ejp?a8mat=3Z0TY0+6D7WOI+447K+C2101\" rel=\"nofollow\">\n<img decoding=\"async\" border=\"0\" width=\"336\" height=\"280\" alt=\"\" src=\"https:\/\/www28.a8.net\/svt\/bgt?aid=240223896385&#038;wid=001&#038;eno=01&#038;mid=s00000019208002025000&#038;mc=1\"><\/a>\n<img decoding=\"async\" border=\"0\" width=\"1\" height=\"1\" src=\"https:\/\/www11.a8.net\/0.gif?a8mat=3Z0TY0+6D7WOI+447K+C2101\" alt=\"\"><\/center>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b9f\u6a5f\u78ba\u8a8d<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">NTP\u30b5\u30fc\u30d0\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8a2d\u5b9a<\/h4>\n\n\n\n<p>NTP\u30b5\u30fc\u30d0\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8a2d\u5b9a\u524d\u306b\u5404\u30eb\u30fc\u30bf\u306eClock\u306e\u72b6\u6cc1\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>Router1#show clock\n.23:10:30.777 UTC Thu Jan 11 2024\nRouter1#show clock\n.23:10:37.323 UTC Thu Jan 11 2024\nRouter1#show clock\n.23:10:38.225 UTC Thu Jan 11 2024\n\n\nRouter2#show clock\n.23:10:31.129 UTC Thu Jan 11 2024\nRouter2#show clock\n.23:10:37.728 UTC Thu Jan 11 2024\nRouter2#show clock\n.23:10:38.633 UTC Thu Jan 11 2024<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8a18\u306f<strong>\u540c\u3058\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u30b3\u30de\u30f3\u30c9\u3092\u6253\u3063\u305f\u7d50\u679c<\/strong>\u3067\u3059\u304c\u3001<strong><span style=\"color:#ff0000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_orange\">0.4\u79d2\u3050\u3089\u3044\u30ba\u30ec\u3066\u3044\u308b<\/span><\/span><\/strong>\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong><span style=\"color:#008000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_green\">NTP\u30b5\u30fc\u30d0\u306e\u8a2d\u5b9a\u300cntp master &lt;\u30b9\u30c8\u30e9\u30bf\u30e0\u5024&gt;\u300d\uff08\u4eca\u56de\u306f\u30b9\u30c8\u30e9\u30bf\u30e0\u50243\uff09\u3092\u5b9f\u65bd<\/span><\/span><\/strong>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>Router1#show ntp status\n%NTP is not enabled.\nRouter1#conf t\nEnter configuration commands, one per line.  End with CNTL\/Z.\nRouter1(config)#ntp master 3\nRouter1(config)#end\nRouter1#show ntp status\n<strong>Clock is synchronized, stratum 3, reference is 127.127.1.1<\/strong>\nnominal freq is 1000.0003 Hz, actual freq is 1000.0003 Hz, precision is 2**17\nntp uptime is 600 (1\/100 of seconds), resolution is 1000\nreference time is E94AF3FB.FB5EA79A (23:10:51.981 UTC Thu Jan 11 2024)\nclock offset is 0.0000 msec, root delay is 0.00 msec\nroot dispersion is 7937.58 msec, peer dispersion is 7937.50 msec\nloopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000000000 s\/s\nsystem poll interval is 16, last update was 6 sec ago.\nRouter1#show ntp associations\n\n  address         ref clock       st   when   poll reach  delay  offset   disp\n<strong>*~127.127.1.1<\/strong>     .LOCL.           2      9     16     1  0.000   0.000 7937.5\n * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured<\/code><\/pre>\n\n\n\n<p><strong><span style=\"color:#0000ff\" class=\"swl-inline-color\"><span class=\"swl-marker mark_blue\">\u8a2d\u5b9a\u3092\u6295\u5165\u3059\u308b\u3053\u3068\u3067\u5185\u90e8\u306eClock\u3068\u540c\u671f\u3055\u308c\u3066\u3044\u308b<\/span><\/span><\/strong>\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6b21\u306b<strong><span style=\"color:#008000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_green\">\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8a2d\u5b9a\u3092\u6295\u5165<\/span><\/span><\/strong>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>Router2#conf t\nEnter configuration commands, one per line.  End with CNTL\/Z.\nRouter2(config)#ntp ser\nRouter2(config)#ntp server 10.0.1.1\nRouter2(config)#end\nRouter2#\nRouter2#\nRouter2#show ntp status\nRouter2#show ntp status\nClock is unsynchronized, stratum 16, no reference clock\nnominal freq is 1000.0003 Hz, actual freq is 1000.0003 Hz, precision is 2**17\nntp uptime is 300 (1\/100 of seconds), resolution is 1000\nreference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)\nclock offset is 0.0000 msec, root delay is 0.00 msec\nroot dispersion is 0.00 msec, peer dispersion is 0.00 msec\nloopfilter state is 'FREQ' (Drift being measured), drift is 0.000000000 s\/s\nsystem poll interval is 64, never updated.\n\n\u301c15\u5206\u5f8c\u306b\u518d\u5ea6\u30b3\u30de\u30f3\u30c9\u5b9f\u65bd\u301c\nRouter2#show ntp status\n<strong>Clock is synchronized, stratum 4, reference is 10.0.1.1<\/strong>\nnominal freq is 1000.0003 Hz, actual freq is 999.5003 Hz, precision is 2**17\nntp uptime is 110600 (1\/100 of seconds), resolution is 1001\nreference time is E94AF838.382E5A0F (23:28:56.219 UTC Thu Jan 11 2024)\n<strong>clock offset is -15.5406 msec, root delay is 0.52 msec\nroot dispersion is 131.29 msec, peer dispersion is 62.68 msec<\/strong>\nloopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000499908 s\/s\nsystem poll interval is 64, last update was 53 sec ago.\n\nRouter2#show ntp associations\n\n  address         ref clock       st   when   poll reach  delay  offset   disp\n<strong>*~10.0.1.1        127.127.1.1      3     61     64     3  0.522 -15.540 62.685<\/strong>\n * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured\n\n<\/code><\/pre>\n\n\n\n<p><span style=\"color:#ff0000\" class=\"swl-inline-color\"><strong><span class=\"swl-marker mark_orange\">\u8a2d\u5b9a\u76f4\u5f8c\u306fRouter1\u300c10.0.1.1\u300d\u306b\u5bfe\u3059\u308b\u30d4\u30a2\u306f\u300cunsynchronized\u300d<\/span><\/strong><\/span>\u3067\u3057\u305f\u304c\u3001<strong><span style=\"color:#0000ff\" class=\"swl-inline-color\"><span class=\"swl-marker mark_blue\">15\u5206\u5f8c\u306b\u518d\u5ea6\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u65bd\u3059\u308b\u3068\u300csynchronized\u300d<\/span><\/span><\/strong>\u306b\u5909\u308f\u3063\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u306f<strong><span style=\"color:#ff0000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_orange\">NTP\u306e\u6642\u523b\u540c\u671f\u306b\u306f\u5c11\u3057\u6642\u9593\u304c\u304b\u304b\u308b\u5834\u5408\u304c\u3042\u308b<\/span><\/span><\/strong>\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u6700\u5f8c\u306b<strong><span style=\"color:#008000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_green\">\u30b5\u30fc\u30d0\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306eClock\u3092\u78ba\u8a8d\u3059\u308b\u3068\u6642\u523b\u5dee\u304c\u307b\u3068\u3093\u3069\u306a\u304f\u306a\u3063\u3066\u3044\u307e\u3057\u305f\u3002<\/span><\/span><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>Router1#show clock\n23:32:06.270 UTC Thu Jan 11 2024\nRouter1#show clock\n23:32:11.660 UTC Thu Jan 11 2024\nRouter1#show clock\n23:32:12.731 UTC Thu Jan 11 2024\n\nRouter2#show clock\n23:32:06.060 UTC Thu Jan 11 2024\nRouter2#show clock\n23:32:11.411 UTC Thu Jan 11 2024\nRouter2#show clock\n23:32:12.504 UTC Thu Jan 11 2024<\/code><\/pre>\n\n\n\n<center><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-2776062481390161\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6 -->\n<ins class=\"adsbygoogle\"\n     style=\"display:block\"\n     data-ad-client=\"ca-pub-2776062481390161\"\n     data-ad-slot=\"2830301217\"\n     data-ad-format=\"auto\"\n     data-full-width-responsive=\"true\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>\n\n\n\n<center><a href=\"https:\/\/px.a8.net\/svt\/ejp?a8mat=3YYD8O+6VOCFM+2VMU+66WOX\" rel=\"nofollow\">\n<img decoding=\"async\" border=\"0\" width=\"728\" height=\"90\" alt=\"\" src=\"https:\/\/www27.a8.net\/svt\/bgt?aid=240108936416&#038;wid=001&#038;eno=01&#038;mid=s00000013431001040000&#038;mc=1\"><\/a>\n<img decoding=\"async\" border=\"0\" width=\"1\" height=\"1\" src=\"https:\/\/www11.a8.net\/0.gif?a8mat=3YYD8O+6VOCFM+2VMU+66WOX\" alt=\"\"><\/center>\n\n\n\n<h3 class=\"wp-block-heading\">\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u3068\u5b9f\u6a5f\u78ba\u8a8d<\/h3>\n\n\n\n<p>\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u3067\u306f\u524d\u7ae0\u306b\u8ff0\u3079\u305f\u901a\u308a\u3001<strong><span style=\"color:#008000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_green\">ACL\u3092\u5b9a\u7fa9\u3057\u3001\u300cntp access-group\u300d\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u3063\u3066\u5236\u5fa1<\/span><\/span><\/strong>\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>(config)# ntp access-group { serve | peer | serve-only | peer-only } { ACL\u756a\u53f7 }<\/code><\/pre>\n\n\n\n<p>\u5b9f\u6a5f\u78ba\u8a8d\u3067\u306f\u3001<strong>Router3\u3092Client\u30e2\u30fc\u30c9\u3067\u52d5\u4f5c\u3055\u305b\u3001\u300c10.0.1.2\u300d\u304b\u3089\u306e\u8981\u6c42\u306f\u53d7\u3051\u4ed8\u3051\u3001\u300c10.0.1.3\u300d\u304b\u3089\u306e\u8981\u6c42\u306f\u7834\u68c4\u3059\u308b\u5f62\u3067\u52d5\u4f5c\u78ba\u8a8d\u3057\u3066\u3044\u304d\u305f\u3044<\/strong>\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>Router1#conf t\nEnter configuration commands, one per line.  End with CNTL\/Z.\nRouter1(config)#ip access-list standard 10\nRouter1(config-std-nacl)#10 permit 10.0.1.2 ?\nRouter1(config-std-nacl)#10 permit 10.0.1.2 0.0.0.0\nRouter1(config)#ntp  access-group serve 10\nRouter1(config)#end\nRouter1#\nRouter1#\nRouter1#\nRouter1#show ntp status\nClock is synchronized, stratum 3, reference is 127.127.1.1\nnominal freq is 1000.0003 Hz, actual freq is 1000.0003 Hz, precision is 2**17\nntp uptime is 16900 (1\/100 of seconds), resolution is 1000\nreference time is E94B8535.84E2EF70 (09:30:29.519 UTC Fri Jan 12 2024)\nclock offset is 0.0000 msec, root delay is 0.00 msec\nroot dispersion is 0.36 msec, peer dispersion is 0.23 msec\nloopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000000000 s\/s\nsystem poll interval is 16, last update was 9 sec ago.<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8a18\u8a2d\u5b9a\u3067<strong><span style=\"color:#0000ff\" class=\"swl-inline-color\"><span class=\"swl-marker mark_blue\">\u30b5\u30fc\u30d0\u5074\u306e\u5236\u5fa1\u306f\u5b8c\u4e86<\/span><\/span><\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u6b21\u306bRouter3\u5074\u3067\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-black-background-color has-background\"><code>Router3#show ntp status\nClock is synchronized, stratum 4, reference is 10.0.1.1\nnominal freq is 1000.0003 Hz, actual freq is 1000.0003 Hz, precision is 2**1\nntp uptime is 12700 (1\/100 of seconds), resolution is 1000\nreference time is E94B84D0.D6E9A150 (09:28:48.839 UTC Fri Jan 12 2024)\nclock offset is -119.1604 msec, root delay is 1.37 msec\nroot dispersion is 5029.87 msec, peer dispersion is 63.47 msec\nloopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000000000 s\/s\nsystem poll interval is 64, last update was 125 sec ago.\nRouter3#conf t\nEnter configuration commands, one per line.  End with CNTL\/Z.\nRouter3(config)#no ntp server 10.0.1.1\nRouter3#show ntp status\n%NTP is not enabled.\nRouter3#conf t\nEnter configuration commands, one per line.  End with CNTL\/Z.\nRouter3(config)#ntp server 10.0.1.1\nRouter3(config)#end\nRouter3#show ntp status\nClock is unsynchronized, stratum 16, no reference clock\nnominal freq is 1000.0003 Hz, actual freq is 1000.0003 Hz, precision is 2**17\nntp uptime is 600 (1\/100 of seconds), resolution is 1000\nreference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)\nclock offset is 0.0000 msec, root delay is 0.00 msec\nroot dispersion is 0.08 msec, peer dispersion is 0.00 msec\nloopfilter state is 'FSET' (Drift set from file), drift is 0.000000000 s\/s\nsystem poll interval is 8, never updated.\n############15\u5206\u4ee5\u4e0a\u7d4c\u3063\u305f\u5f8c\u306b\u5b9f\u884c###############\nRouter3#show ntp status\nClock is unsynchronized, stratum 16, no reference clock\nnominal freq is 1000.0003 Hz, actual freq is 1000.0003 Hz, precision is 2**17\nntp uptime is 34900 (1\/100 of seconds), resolution is 1000\nreference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)\nclock offset is 0.0000 msec, root delay is 0.00 msec\nroot dispersion is 5.23 msec, peer dispersion is 0.00 msec\nloopfilter state is 'FSET' (Drift set from file), drift is 0.000000000 s\/s\nsystem poll interval is 8, never updated.\nRouter3#show ntp asso\nRouter3#show ntp associations\n\n  address         ref clock       st   when   poll reach  delay  offset   disp\n ~10.0.1.1        .INIT.          16      -     64     0  0.000   0.000 15937.\n * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8a18\u306e\u901a\u308a\u3001<strong><span style=\"color:#ff0000\" class=\"swl-inline-color\"><span class=\"swl-marker mark_orange\">Router1\u306eNTP\u30b5\u30fc\u30d0\u300c10.0.1.1\u300d\u3068\u306f\u540c\u671f\u3067\u304d\u3066\u306a\u3044<\/span><\/span><\/strong>\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong><span style=\"color:#0000ff\" class=\"swl-inline-color\"><span class=\"swl-marker mark_blue\">ACL\u5236\u5fa1\u3092\u3059\u308b\u3053\u3068\u3067\u610f\u56f3\u3057\u306a\u3044\u30b5\u30fc\u30d0\u3084\u30eb\u30fc\u30bf\u3068\u306e\u540c\u671f\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span><\/span><\/strong><\/p>\n\n\n\n<center><a href=\"https:\/\/px.a8.net\/svt\/ejp?a8mat=3TNY5O+K8RCI+399O+64JTD\" rel=\"nofollow\">\n<img decoding=\"async\" border=\"0\" width=\"300\" height=\"250\" alt=\"\" src=\"https:\/\/www23.a8.net\/svt\/bgt?aid=231224748034&#038;wid=001&#038;eno=01&#038;mid=s00000015198001029000&#038;mc=1\"><\/a>\n<img decoding=\"async\" border=\"0\" width=\"1\" height=\"1\" src=\"https:\/\/www19.a8.net\/0.gif?a8mat=3TNY5O+K8RCI+399O+64JTD\" alt=\"\"><\/center>\n\n\n\n<h2 class=\"wp-block-heading\">\u6700\u5f8c\u306b<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u57fa\u672c\u3068\u306a\u308b\u6642\u523b\u540c\u671f\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308b\u300cNTP\u300d\u306b\u3064\u3044\u3066\u3061\u3087\u3053\u3063\u3068\u307e\u3068\u3081\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u4ee5\u5916\u3068\u308f\u304b\u3063\u3066\u3044\u305f\u3064\u3082\u308a\u306b\u306a\u3063\u3066\u3044\u305f\u3053\u3068\u3082\u591a\u3005\u3042\u308b\u3093\u3060\u306a\u3068\u6700\u8fd1\u3064\u304f\u3065\u304f\u611f\u3058\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6b21\u56de\u3082CCNP\u95a2\u9023\u306e\u52c9\u5f37\u3092\u3057\u305f\u3089\u307e\u3068\u3081\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n<ul class=\"wp-block-latest-posts__list is-grid columns-3 has-dates wp-block-latest-posts\"><\/ul>\n\n\n<center><!-- START MoshimoAffiliateEasyLink -->\n<script 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