On Dec 1, 3:07 pm, Joseph Gwinn <[EMAIL PROTECTED]> wrote: > In article > <[EMAIL PROTECTED]>, > > [EMAIL PROTECTED] wrote: > > Does anybody know of any *practical* samples on how to > > implement NTP/SNTP client?. The goal is to provide accurate > > time for a program/client running on Windows Vista. > > > Specifically, what values to include in the the request message, > > how to process the reply message, etc. > > > I am NOT asking how to send/receive UDP datagrams, or where > > to find comprehensive descriptions like RFC documents, or how > > to build or design user interfaces. > > > Only a narrow description focused on NTP/SNTP request/reply > > datagrams for a simple PC client, preferably in C/C++ source > > code. > > I've done this in an embedded realtime system. (No, the source code is > not available.) > > In Appendix A of RFC-1305 you will find the format of the NTPv3 > request/response packet. Send this packet to port 123 of the NTP > server, and read the reply packet. It's pretty easy. >
I saw this format. From data comm point of view it is very unusual to have the same format for request and reply. Sending/receiving the packet to port 123 is the first thing I tried. This is not an issue. The issue is to use all the values in request and reply correctly and reliably. And the quickest way is to get as many ***samples*** as possible, the RFC doc ***alone*** is the slowest way. _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
