如何将Win7做为NTP服务器
1. 修改注册表项HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer
Enabled 设定为 1（默认0）
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config\
AnnounceFlags 设定为 5 （默认 10）
ValueMeaning 0
Timeserv_Announce_No, Reliable_Timeserv_Announce_No. The domain controller does not advertise time service.
1
Timeserv_Announce_Yes. The domain controller always advertises time service.
2
Timeserv_Announce_Auto. The domain controller automatically determines whether it should advertise time service.
4
Reliable_Timeserv_Announce_Yes. The domain contoller will always advertise reliable time service.
8
Reliable_Timeserv_Announce_Auto. The domain controller automatically determines whether it should advertise reliable time service.
2. 禁用防火墙或设置例外，UDP 123端口。
3. 运行 services.msc，将Windows Time服务设置成自动（延迟启动）
Win7下如果设置成自动，下次重启后此服务会被停止，原因不详。
经实验，延迟启动也并不需要用户登录即可启动。
4. 重启动校时服务：net stop w32time && net start w32time
网络设备（如cisco、h3c交换机……）不能正常同步NTP服务器时间：
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config\LocalClockDispersion
值修改为0 （默认为0x0000000a）
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