instacart/truetime-android

Local area network (LAN) to build the NTP Server is not work

xfdr0805 opened this issue · 1 comments

xfdr0805 commented

//ntp1.aliyun.com ok
//TrueTime.build().withNtpHost("120.25.115.20").initialize();

Local area network (LAN) to build the NTP Server is not?
LAN structures, I've tested the server is normal
but
TrueTime.build().withNtpHost("192.168.0.73").initialize();
W/System.err: at com.instacart.library.truetime.SntpClient.requestTime(SntpClient.java:159)

Who cna hlep me ?,thanks a lot

scorpiodawg commented

@xfdr0805 If I'm understanding this correctly, your LAN's server probably has wider dispersion than acceptable causing the build() call to fail:

truetime-android/library/src/main/java/com/instacart/library/truetime/SntpClient.java

Line 158 in 0630cdf

if (rootDispersion > rootDispersionMax) {
.

See this post for some context: https://serverfault.com/questions/768280/what-is-ntp-dispersion-and-how-do-i-control-it. You could increase your root dispersion or fix the server on the LAN itself.