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Copy file name to clipboardExpand all lines: NetTools/dig.md
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## 一、nslookup
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>nslookup is a tried and true program that has weathered the ages. nslookup has been deprecated and may be removed from future releases. There is not even a man page for this program.
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>nslookup is a tried and true program that has weathered the ages. nslookup has been deprecated and may be removed from future releases. There is not even a man page for this program.
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因此,这里不过多介绍。
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Copy file name to clipboardExpand all lines: Services/NTP.md
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Network Time Protocol(NTP) 是用来使计算机时间同步化的一种协议,它可以使计算机对其服务器或时钟源(如石英钟,GPS 等等)做同步化,它可以提供高精准度的时间校正(LAN 上与标准间差小于1毫秒,WAN上几十毫秒),且可使用加密确认的方式来防止恶毒的协议攻击。默认使用 `UDP 123端口`
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NTP 提供准确时间,首先需要一个准确的UTC时间来源,NTP 获得 UTC 的时间来源可以从原子钟、天文台、卫星,也可从 Internet 上获取。时间服务器按照 NTP 服务器的等级传播,根据离外部 UTC 源的远近将所有服务器归入不用的层 (Stratum) 中。Stratum-1 在顶层由外部 UTC 接入,stratum-1 的时间服务器为整个系统的基础,Stratum 的总数限制在 15 以内。下图为 NTP 层次图:
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NTP 提供准确时间,首先需要一个准确的 UTC 时间来源,NTP 获得 UTC 的时间来源可以从原子钟、天文台、卫星,也可从 Internet 上获取。时间服务器按照 NTP 服务器的等级传播,根据离外部 UTC 源的远近将所有服务器归入不用的层 (Stratum) 中。Stratum-1 在顶层由外部 UTC 接入,stratum-1 的时间服务器为整个系统的基础,Stratum 的总数限制在 15 以内。下图为 NTP 层次图:
*[最新版本的 openvpn-2.3.1 官方不再集成`easy-rsa`] Note that easy-rsa is no longer bundled with OpenVPN source code archives. To get it, visit the easy-rsa page on GitHub, or download it from our Linux software repositories.
*[最新版本的 openvpn-2.3.1 官方不再集成`easy-rsa`] Note that easy-rsa is no longer bundled with OpenVPN source code archives. To get it, visit the easy-rsa page on GitHub, or download it from our Linux software repositories.
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