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            Linux系统下NTP服务的配置注意事项

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              在Linux下NTP的尺度设置中  ,许多关于同步的方式差别  ,注重以下事项:

              若是不想让其它任何服务器会见本机的NTP服务:此设置也将造成当地的NTP无法会见外部的NTP服务:

              If you want to deny all machines from accessing your NTP server  , add the following line to /etc/ntp.conf:

              restrict default ignore

              若是允许当地的服务器会见本机的NTP服务  ,设置如下:

              If you only want to allow machines within your own network to synchronize their clocks with your server , but ensure they are not allowed to configure the server or used as peers to synchronize against  , add

              restrict 192.168.1.0 mask 255.255.255.0 nomodify(限制修改) notrap(限制trap) noquery(限制查询) 注:应当排除noquery

              其中default为0.0.0.0/0

              restrict default nomodify notrap

              有些情形下  ,除非作废notrust/nomodify/notrap设置 ,client段的ntp服务才气有用事情  。