Networking
DHCP 更新失敗 - 網際網路每 2 小時掉線一次
每 2 小時，所有工作站都會失去網際網路連接 10 秒。ISP 技術支持似乎不願意解決這個問題，所以我正在嘗試自己解決它。這是我們的網路圖：
我寫了一個shell腳本來記錄輟學。該腳本（在遠端伺服器上）每秒 ping 我們的外部 IP 地址並記錄 ping 失敗的時間段。以下是日誌的摘錄：
======================================= Failure Start Length ======================================= 2016-08-16 17:52:11 10 sec 2016-08-16 19:52:23 10 sec 2016-08-16 21:52:34 10 sec 2016-08-17 23:52:46 10 sec此外，這是路由器日誌的摘錄：
50 2016-08-16 17:29:03 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 51 2016-08-16 17:31:07 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 52 2016-08-16 17:33:11 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 53 2016-08-16 17:35:15 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 54 2016-08-16 17:36:51 <5> : WAN1:DHCP lease timeout, beging a new one. 55 2016-08-16 17:38:51 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 56 2016-08-16 17:40:55 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 57 2016-08-16 17:42:59 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 58 2016-08-16 17:45:03 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 59 2016-08-16 17:47:07 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 60 2016-08-16 17:49:11 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 61 2016-08-16 17:51:15 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 62 2016-08-16 17:51:51 <5> : WAN1:DHCP renew fail, begin a new discovery. 63 2016-08-16 17:52:02 <5> : WAN1:DHCP getting IP succeeded, and IP addr:XX.XX.XX.97, mask:255.255.254.0, gateway:XX.XX.XX.1. 64 2016-08-16 18:54:06 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 65 2016-08-16 18:56:10 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 66 2016-08-16 18:58:14 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 67 2016-08-16 19:00:18 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 68 2016-08-16 19:02:22 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 69 2016-08-16 19:04:26 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 70 2016-08-16 19:06:30 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 71 2016-08-16 19:08:34 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 72 2016-08-16 19:10:38 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 73 2016-08-16 19:12:42 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 74 2016-08-16 19:14:46 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 75 2016-08-16 19:16:50 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 76 2016-08-16 19:18:54 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 77 2016-08-16 19:20:58 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 78 2016-08-16 19:23:02 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 79 2016-08-16 19:25:06 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 80 2016-08-16 19:27:10 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 81 2016-08-16 19:29:14 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 82 2016-08-16 19:31:18 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 83 2016-08-16 19:33:22 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 84 2016-08-16 19:35:26 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 85 2016-08-16 19:37:02 <5> : WAN1:DHCP lease timeout, beging a new one. 86 2016-08-16 19:39:02 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 87 2016-08-16 19:41:07 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 88 2016-08-16 19:43:10 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 89 2016-08-16 19:45:14 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 90 2016-08-16 19:47:19 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 91 2016-08-16 19:49:22 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 92 2016-08-16 19:51:26 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 93 2016-08-16 19:52:02 <5> : WAN1:DHCP renew fail, begin a new discovery. 94 2016-08-16 19:52:14 <5> : WAN1:DHCP getting IP succeeded, and IP addr:XX.XX.XX.97, mask:255.255.254.0, gateway:XX.XX.XX.1. 95 2016-08-16 20:54:18 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 96 2016-08-16 20:56:22 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 97 2016-08-16 20:58:26 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 98 2016-08-16 21:00:30 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 99 2016-08-16 21:02:33 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 100 2016-08-16 21:04:37 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 101 2016-08-16 21:06:41 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 102 2016-08-16 21:08:46 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 103 2016-08-16 21:10:50 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 104 2016-08-16 21:12:54 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 105 2016-08-16 21:14:58 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 106 2016-08-16 21:17:02 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 107 2016-08-16 21:19:06 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 108 2016-08-16 21:21:09 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 109 2016-08-16 21:23:14 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 110 2016-08-16 21:25:17 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 111 2016-08-16 21:27:22 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 112 2016-08-16 21:29:26 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 113 2016-08-16 21:31:30 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 114 2016-08-16 21:33:34 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 115 2016-08-16 21:35:38 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 116 2016-08-16 21:37:14 <5> : WAN1:DHCP lease timeout, beging a new one. 117 2016-08-16 21:39:14 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 118 2016-08-16 21:41:18 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 119 2016-08-16 21:43:22 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 120 2016-08-16 21:45:26 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 121 2016-08-16 21:47:30 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 122 2016-08-16 21:49:34 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 123 2016-08-16 21:51:38 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 124 2016-08-16 21:52:14 <5> : WAN1:DHCP renew fail, begin a new discovery. 125 2016-08-16 21:52:25 <5> : WAN1:DHCP getting IP succeeded, and IP addr:XX.XX.XX.97, mask:255.255.254.0, gateway:XX.XX.XX.1. 126 2016-08-16 22:54:29 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 127 2016-08-16 22:56:33 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 128 2016-08-16 22:58:37 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 129 2016-08-16 23:00:41 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 130 2016-08-16 23:02:45 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 131 2016-08-16 23:04:49 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 132 2016-08-16 23:06:54 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 133 2016-08-16 23:08:58 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 134 2016-08-16 23:11:02 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 135 2016-08-16 23:13:05 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 136 2016-08-16 23:15:09 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 137 2016-08-16 23:17:13 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 138 2016-08-16 23:19:17 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 139 2016-08-16 23:21:21 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 140 2016-08-16 23:23:26 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 141 2016-08-16 23:25:30 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 142 2016-08-16 23:27:34 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 143 2016-08-16 23:29:38 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 144 2016-08-16 23:31:42 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 145 2016-08-16 23:33:46 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 146 2016-08-16 23:35:50 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 147 2016-08-16 23:37:25 <5> : WAN1:DHCP lease timeout, beging a new one. 148 2016-08-16 23:39:25 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 149 2016-08-16 23:41:29 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 150 2016-08-16 23:43:33 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 151 2016-08-16 23:45:37 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 152 2016-08-16 23:47:41 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 153 2016-08-16 23:49:45 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 154 2016-08-16 23:51:49 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 155 2016-08-16 23:52:25 <5> : WAN1:DHCP renew fail, begin a new discovery. 156 2016-08-16 23:52:37 <5> : WAN1:DHCP getting IP succeeded, and IP addr:XX.XX.XX.97, mask:255.255.254.0, gateway:XX.XX.XX.1. 157 2016-08-17 00:54:42 <5> : WAN1:DHCP send DHCP-REQUEST timeout. 158 2016-08-17 00:56:46 <5> : WAN1:DHCP send DHCP-REQUEST timeout.每次我們得到一個 dropout 時，路由器都會記錄“DHCP 更新失敗”和“DHCP 獲取 IP 成功”。可能是什麼問題？它與外部IP地址的租用時間有關嗎？
還有這些“DHCP 發送 DHCP-REQUEST 超時”日誌是什麼？
謝謝！
看起來您的 ISP 網路管理員在 DHCP 上的配置有問題。DHCP 客戶端的標准設置是在租約結束時呼叫以續訂，並繼續嘗試直到續訂發生。日誌告訴我您的 ISP 有 2 小時的租約。但中途更新失敗。可能被屏蔽了。
我還看到 DHCP 發現正在工作，而 DHCP 更新卻沒有。
跟在他們後面。我懷疑他們有網路管理員的空缺，而其他人正試圖填補這個角色。或者他們有一個沒有經驗的新人。閱讀 DHCP RFC，並與他們的技術支持人員通話。