此外每次重启NTP服务器之后大约要3-5分钟客户端才能与server建立正常的通讯连接,否则你在客户端执行“ntpdate 服务器ip”的时候将返回:
27 Jun 10:20:17 ntpdate[21920]: no server suitable for synchronization found
下面是来自ntp官方网站的说明:
The behavior of notrust changed between versions 4.1 and 4.2.
In 4.1 (and earlier) notrust meant "Don't trust this host/subnet for time".
In 4.2 (and later) notrust means "Ignore all NTP packets that are not cryptographically authenticated." This forces remote time servers to authenticate themselves to your (client) ntpd