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W32time의 높은 정확도 요구사항

  • Artigo

???? : High Accuracy W32time Requirements

https://blogs.technet.com/askds/archive/2007/10/23/high-accuracy-w32time-requirements.aspx

?????? ??????? ???? ??? ?? ?(Bob Drake)???. ?? ?? ???? ??? ?? ????? ???? ??? ?? ??? ????. ? ???, ??? ??? ??? ????? ????. ??, ?? ??? ?? ? ?? ???? ??? ??? ??? ????. ??? ? ???? ??? Windows Time service (W32Time)? ??? ??????, ???? ???? ??? ?? ???? ??? ??? ?? ? ?? ???? ????? ???????.

???? ??, RFC 1305 "Network Time Protocol (Version 3) Specification, Implementation and Analysis"? ??? ??? ????. ??? ?? ?? ??? ??? ????.

l "NTP? ?? ?? ? ?? ???? ?? ?? ????? ???? ??? ??? ?? ??? ???? ??? ????."

l "??? ??? ??? ??? ??? ????, ? ??? ???? ??????? ?????(millisecond)? ???? ?? ? ??. ??? ????? ?? ?? ?????? ???? ???? ??? ??? ????."

l "?? ??? ??? ???? ??? ????? ?? C? ???? ??. ???, ?? ????? CPU? ??????, ??? ?? ??? ??? ?????? ???? ??? ?? ? ??."

??? ???? ?? ??? ?? ??? ??????, NTP? ??? ?????(nanoseconds)?? ??? ? ?? ??? ???.

??? ???????? ?????? ??????. Windows Time Service ?? ?????? stratum? ??? ?? stratum? ???? ?????? ????.

"???? ??? ??? ??? stratum??? ???. ?????? ?? ??? ?? ???(???? ????) ?? ?? stratum ?? ?? stratum 1? ???. ? ??? ?? ??? ?? ????? ???. NTP ??? ?? ???? ??? ?? stratum? ??? ?? ???? ??? ?? ????. NTP ????? ??? ?? ???? ?? ???? ??? ?? ??? ???, stratum? ???? ?? ?? ??? ?? ???? ??? ?? ???. "?????" stratum ??? ?????, ??? ??? ??? ? ?????. ???, ?? ???? stratum ??? ??? ???? ?? ??? ?? ??? ?????? ????."

W32Time? ??? ??? ?? ??? ??? ??. W32Time? ??? ?, W32Time.dll? Windows 2000?? ????? "???"? ?????? ??? ??? ?? ?? ????? Kerberos V5? ????. ???? RFC 1510 Kerberos?? ??? ??? ???? ??? ????.

• RFC 1510: "??? ??(??) ??? ????? ??? ???? ??(?: 5?)? ????, KRB_AP_ERR_SKEW ??? ????.

?? ???, W32time? Kerberos ????? ???? ?? ?? ???? 5? ???? ?? ???? ??? ?????. ??? ?? ??(?? ???? ??? ???? ?????? ?? ??? ?? Kerberos ??? ????)? ?? ??? ???. ???? ??? ??? ??? ????? ??? ??? ????.

 

KB 939322? ??? ?? ??? ????.

"?? ???? ??? ?? Windows Time service? ???? ?? ??"

"?????? W32Time ???? ???? ???? ?? ???? ????. W32Time ???? ??? ??? ?? ????? ???? ?? ??? NTP ???? ????. W32Time ???? ??? ?? ??? ???????.

 

• Kerberos ?? 5 ?? ????? ????? ???????.

• ????? ???? ??? ??? ??? ?????.

W32Time ???? 1??? 2?? ???? ????? ??? ??? ??? ? ????. ??? ????? W32Time ? ?? ?? ?? ????. "

??? ???????? ??? ?? ???? ??? ?? ??? ???? ?? ???? ?????.

 

• ????? : https://tf.nist.gov/general/softwarelist.htm

• ???? : https://tf.nist.gov/timefreq/general/receiverlist.htm

??? ?? ??? ? ?? ???, ?? ??? ??? ?????, ? 10,000? ??? ?????. :-)

?? ?????? W32time? ???? ??? ???? ??? ???? ?????.

- Bob Drake