As I mentioned in my Solve an obscure Back to my Mac issue blog entry, it’s possible to configure OS X’s time servers to be a bit more robust than just relying on one time server—if that server goes ...

openwrt开发中，我们可能遇到这样需求，使用路由器支持局域网内设备ntp授时功能。 NTP（Network Time Protocol，网络时间协议）是由RFC 1305定义的时间同步协议，用来在分布式时间服务器和客户端之间进行时间同步。NTP基于UDP报文进行传输，使用的UDP端口号为123。

I'm kind of curious about the actual accuracy of NTP. When I try to research the topic I hear stuff like "stratum 1 is fractions of a millisecond and stratum 2 is within 100ms" and then I see people ...

I have a few dumb devices (Gemtec IoT LoraWAN gateways) on one network that rely on NTP to function correctly. After they were installed, they worked for about 1 day then stopped relaying sensor info ...