SNTP (Time 동기화 서버)

ㆍ언어대상 : C#   ㆍ작성자 : 김민석   ㆍ간단설명 : 인터넷 Time Server를 통해 시간 동기화 하기  

여러 프로토클 확인해본 결과 아래 소스가 정상적으로 잘 작동된다.

Introduction

Though not obvious, time synchronization is sometimes important. The best example is the Kerberos authentication protocol, which requires the resources to be synchronized within minutes or even seconds, but there are other situations as well. The Network Time Protocol (NTP) and its simplified form (SNTP) are widely used to synchronize network resources, due to their simplicity and effectiveness. There are many programs available that synchronize your PC's clock with that of a time server. Dimension 4 is my favorite.

In case you need time synchronization embedded into your software, here is the C# alternative. It's simple, fast and integrates seamlessly with the .NET platform. There is a Java implementation of a NTP client by Michel Van den Bergh, but I don't have the URL anymore. Maybe Michel reads this and will send me a note.

There are several time severs on the Internet and the list below contains those operated by NIST. If you need more, use a search engine.

Name	IP Address	Location
time-a.nist.gov	129.6.15.28	NIST, Gaithersburg, Maryland
time-b.nist.gov	129.6.15.29	NIST, Gaithersburg, Maryland
time-a.timefreq.bldrdoc.gov	132.163.4.101	NIST, Boulder, Colorado
time-b.timefreq.bldrdoc.gov	132.163.4.102	NIST, Boulder, Colorado
time-c.timefreq.bldrdoc.gov	132.163.4.103	NIST, Boulder, Colorado
utcnist.colorado.edu	128.138.140.44	University of Colorado, Boulder
time.nist.gov	192.43.244.18	NCAR, Boulder, Colorado
time-nw.nist.gov	131.107.1.10	Microsoft, Redmond, Washington
nist1.datum.com	209.0.72.7	Datum, San Jose, California
nist1.dc.certifiedtime.com	216.200.93.8	Abovnet, Virginia
nist1.nyc.certifiedtime.com	208.184.49.9	Abovnet, New York City
nist1.sjc.certifiedtime.com	208.185.146.41	Abovnet, San Jose, California

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

[출처]

http://www.codeproject.com/Articles/1005/SNTP-Client-in-C

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