win7搭建局域网ntp服务器

近日，本人想在局域网内通过普通的windows7PC搭建一台NTP效劳器，可看似简单的配置却给我捣腾了了半天。初期，参考了互联网的上相关的配置文档，可网络设备就是死活不同步NTP效劳器的时间。实在没方法，只有通过来抓包分析了，经过一番研究后，终于找到问题，现将这个文档与大家分享：通过windows系统为局域网搭建NTP效劳器，为局域网内网络设备提供时间效劳，经过测试，使用于windowsxp、windows2003、windows7。、启用NTPServer。为此，请按照以下步骤操作：单击“开始〞，单击“运行〞，键入“regedit〞，然后单击“确定〞进入注册表;找到并单击下面的注册表子项：HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/W32TimeTime/Providers/NtpServer在右窗格中，右键单击“Enabled〞，然后单击“修改〞;在“编辑DWORD值〞的“数值数据〞框中键入“1〞，然后单击“确定〞、假设使用NTPServer，建议关闭NTPClinet，找到并单击下面的注册表子项：b.在右窗格中，右键单击“Enabled〞，然后单击“修改〞;

c.在“编辑DWORD值〃的“数值数据〃框中键入0〃，然后单击“确定〃0〃，然后单击“确定〃a、Configb.在右窗格中，右键单击“AnnounceFlags〃，然后单击“修改〃；c.在“编辑DWORD值〃的“数值数据〃框中键入“5〃，然后单击“确定〃4、按照以上步骤设置完成后，经测试windows系统的客户端均能正常同步NTP效劳器的时间，通过抓包可以看到：〔效劳器〕client-server10.16O>.11.71W,Ififl.lU.JS?HTFinNT?versioniframe3Dbytesanwire(7ZDbits),90bytescaptured(720bits)NT?version1fChernetIIdsrtsHdoHjIpf_C1(44S"37"rf：LL：a5:53)jEfet：vmwdre_?l:ifi:dT(04::Sft:af)$IimcernerPi^OCOCOlvers.fw4fsrc：10-ISO,!!.?52(10.?52)iQST；10-1WP15.75(10.160-11-7?)吊UserProtocolpSrcPertsntp(123).totPort;ntp(123)-NetworkTimeProtocDllHPlags:&xdbtl..n...一lpindicator:unknown(clockunsynchrorlz&dj(1)r.011…嗝-verslchnrmuber：htpversion3C3)i..।.Oil-Mtxle:client(3JPeerClack1sbatu・：uMpecifiedorimiHd(0)Pollingirttfrva"|：id(1074sec)peerclM：kpreclsioni：0.D15i625RootDelsy:0,0000secRoutiorib1.01^6RiiftrtnctHD：NULLReferencerlnesrafip:3ar1,19-D00:00:oa.acDaaaci□□irrcoriginrimesiajmp:Jan1?1色/电(>&iOO00,floaOCOMO1utcWwerg:j才hLt197000:00:00,000000000IriTTiranswitTijmtsp;Aug2%2014M;32;=14■318259000UITCserver—client:10.16&.10,160.11.7^MVflOhirvri^iOM1.cI1P6(了店口EO1口13L7孑10,IMLl,3，Z5?NTFMWTPY8T31口冷为■59/,呻广ilftaae76360:90taytesorirtlre(*20bits)a5Db/tescaptured("2Chirs)hjEihemciisrc2vnrhAr^jlsAfl：jf《00上配，2号221!部号>0,1dsitzHcwwiiipr^ciza%s32(44：37：es^cl：a5212)djIfitpfnerPraracolver-51onJ.,srciID-163,li.73(10«160.1^.7a).Dsriin.l6a.11.(10.16D.u.2»)+juserCaraqramPrutcjcolBSrcPott：nr「fl21)pOstPott：rirp(123)dMetwarkTimePratacolT，甘取3收If00.A■l«uHWilciTW：nowinning(0)1..,=Ver5ionnuBber：fifTPversion3……-100=^ade:server⑷clockstratum：primaryrtfererceCl)MlUngim.trsiq门必stc)PeerClockPrecision:a85625secRoot[>alay:CLOOOBsecRIdoLDispers>loti：.ID.D171secdefercnct1口；uncAliibrat^dlocdldockermceTimF5tamp^Aug20?G1看CM;10;00I12*074000UTCOrijinTim-t百呷;Aug2Q,2014(H=3?;14r318259000UTCBeceiv^Ti«5tajnp：Aug20,201*04;S2;ll,17W5000UTCT『加51HtTf碇5tQN；Aug2Qt2014M：Ws11h17187S00CIJTC5、但此时网络设备〔如cisco、h3c交换机……〕仍然不能正常同步NTP效劳器时间，始终显示unsynchronized,通过抓包可以看到:从网络设备〔NTP客户端〕到到NTP效劳端的数据包里面，NTP协议中字段为:ReferenceID:unidentifiedreferencesourceclient-server*TjgSaurc.«wiVnaticnPriXocdungohMo•32111549.876110.160.13^23710.160^13.75NTP9-QHTPVersigp3iclientB321?1549.A4S95a10.160.11.F310,160.13.?37MTP90,TPWersion3(server83236IBSOu94401315160.13.210,160.13.73MTPg。MTiPVersionJtcllient132371550.94^323110.ICO.13.7310.180,12.227NTP90NTPwer£lM3-,stirvertFram«曳)bj,ltsonwtre(72Qbits),40byrescaprurwtt(72db-rts)~EthernetII1SrtsUi53q5;T;&Qf3;a4;eM;55;S;工6,Dat;7^irc_21fg;Qc;2;51;上F).1.iiKtrn&TPrortKBlversion4rio.isa.13.?37tio.ifia.i3.737J,Dei：io.iw.13.7fC。.:16cLi3,"1rUserData5ali?rot&Dol.STcPort:ntp(123J,tutPort:ntp(U3)hetnork7ineProtocolI门的品6db12Lttfinditiror:unionown(clKkuwyriclironij<d>(三]L,.-versionnumber;ntpversion3(3)oil-Mode:clitnt<3)^eerCl&ck与trarurrt;urUpfifit1£dOr1ix-aIid(t))P«erPQtlI叩inLtirvJl：右biiC)p^*rclockprerlsifln:a.ooixmus(*rRoot&elsvi0.0013srootDlsparstcn:_0.0672s«caef#renc^id：unld^rrrlfledreferfrmfestaLirceEteferenceTinestan^pzAi#g2Dd2014Qi;llz114B92CX)QUTCoriginTlfflestarnip:Jan1,197000:00:00,000000000uTcRecelTi«esTAVp!Ian1.H?0dOtOD:OO.QOOOOQOOOUTCTTdnq*tTirvutanpiAug20.201W04^33:03412G416000UTCserver—client|a12111549,W761IC.IflO-11,237L0.L00.1J.73♦IP帅MTP*金「51M3,c11eritIM*.38：萨10-160.U.717MTP11y虹匚u■236IL利行1O.16Q.Uh237IQ-lflQiU.759flNTPVer>ipn丸client3323^1550t-9^423110-160.15-73J74TP90NTP^•ersion3(server■i出Frame90Uytesdhwire(?20Mts^,gcbytes,captured(Z20bits)!ETM"呢［lleWU5rw“e_Zl：fiS：A『［OC：0C：29：?1：afJiMt：CfSCO_55：C2KO<b4：<>l：eJ'55：C2：itO5tinterrwtProtocolver51ongrc；10.160.1北丁¥(10.1^0.11.7?)।y，鼠；lO.lW.l?.?37(10B11.了UseriDrt^graniPrgtgc,??l,SrcPort;ntp(12却用口stPort；ntpQL2箝□'ietworkTiheProtocol曰Flags!.ihtlcGO,.-aaB«leapxndlEitor：iwiw-riniing(0),I...-versionmumher;ntfversion3O).『…a109.Mode;sserver14)PeerCIK.k5tratum;primaryrefererce(1)Hertollinginterval:&(wsec)Clockprerlsion:dG找？55*caao-rne-I0P0CK3Qsecrodcolsperslont10,0177secR.ef^er«nceID;uhcaIibrdtcd1Katcloc.kfttferenceTirwit.anip'：Mig：20,2014dA:J0:00.12S49$l0CDUTCoriginTiwwstiiip：Aug工Q,ZOUM：33:03.12941^000UTCReceiveTimestamp!Aug20.,201404:z3:01.QaJS-DQMDUTCrransmlcTii»e51Mp:Awg20a之a404；35：0i,0625(Mk)00utc6、经过一番捣腾后，发现修改注册表能解决以上问题:Con巾g\LocalClockDispersion值修改为0此时可以看到client—server的数据包中，NTP协议的字段ReferenceID携带了NTP效劳器的IP地址，为以下列图：〔即此时网络设备可以正同步NTP效劳时间〕ReferenceID，〔NTP效劳器IP地址〕client—server:L-R.ISt13»731362942367.giZ5iM；15629523G7,9]L2ai710.3J».1J+2JJL-R.ISt13»731362942367.giZ5iM；15629523G7,9]L2ai710.3J».1J+2JJ!□,160-11x73LJ.lfaO-lJxiJ/ntpntpMTPNTPmtpvtrsiar力mtpv*rsiflnservermTPwersiar3.cllentMTPversionJ;Bq电r，0r*ifrafleJL5J597:毁byreaonwireC72Q那byr«captured(72Dt>1o)-iErb-erf«tii.src:Ci5co^55：c2：co:电力55：G：e)由ost:v«arezi^s：af(0Q；oc：Z9：2]L：BM：af)-hinrernfltPnErtccalV€rsii>n4fearc:10.150=13.237(10,160.13.2373bDst:lD.ieD.13-73(10-160^is.73^■hui<rData^ranPirOTflcal(srcPortsntp£1231.Ds-t.Pottimp(1231-iMttworikt1mProTKGl口FlagylQ»QbaO..B**-=l电即Indicator:nowarnifigfa>，.处工1.*a=Vfiri1nurbtifjhTPVersion』(J),011・Hqd堂1Cl11H：,t3>Pe«rClackstratymrsecomidiryreference(2)FeerPollirug;Intervalz&(64sec)Pe«rClockPreLliian：0」。口中MJ4me仁Root&eldiy:0»0017“cWwtDispersion;Q,O247secRefererce二口:10.Ibti.13.7^Refetenc.ETiXEt-二3g20.2014M：4S^34.0U15J000UTtOriginT[e—up:Aug；0h201404;4);34101562^000UMReceiveTiMBtamp:Aug2DP2014(M；45；M.0131S1QODWTCTransniitTirestarip;Aug20a201$04；45;35*.OT7&03000UTTserver—client:la.160.15.217krpgoMPverilisnipull也nrtla.160.15.217krpgoMPverilisnipull也nrt1阪M2K7.»25U15629521€7.91231~1QL160.13.73ia_lSO.12.23~HTPNTPwN-Tpver5lnn3Prlieni：90N.TPversion1pserver*_ITFKFrame153598;Mbyt-e'sonwire(~20tHt。.Wbytescaptured(720bitsi[±Ethernet±1rE「匚：Wwariel_21;€8;at(&O;Oc;29;21.