Notaios6
ios6 1 3 时间:2021-02-23 阅读:()
VistageraldosmecanismoskeepalivenoCiscoIOSndiceIntroduoInformaesdeApoioMecanismosdokeepalivedeinterfaceInterfacesdeEthernetInterfacesseriaisManutenesdeatividadedeHDLCManutenesdeatividadedePPPInterfacesdotúnelGREKeepalivescriptoKeepalivesdeIKEKeepalivesNATIntroduoEstedocumentodescreveosváriosmecanismoskeepalivenodoCiscoIOS.
InformaesdeApoioOsmensagensdekeepalivesoenviadosporumdispositivoderedeatravésdeumexameoudeunscircuitosvirtuaisafiminformaraindaumoutrodispositivoderedeesseocircuitoentreelesfunes.
ParaqueoKeepalivestrabalhehádoisfatoresessenciais:Ointervalokeepaliveéoperíododetempoentrecadamensagemdekeepalivequeéenviadoporumdispositivoderede.
Istoésempreconfigurável.
qAsnovastentativasdokeepalivesoonúmerodevezesqueodispositivocontinuaaenviarapacoteskeepalivesemrespostaantesqueoestadoestejamudadoa"parabaixo".
ParaalgunstiposdeKeepalivesistoéconfigurável,quandoparaoutrohouverumvalorpadroquenopossasermudado.
qMecanismosdokeepalivedeinterfaceInterfacesdeEthernetEmmeiosdetransmissotaiscomoumEthernet,oKeepalivesélevementeoriginal.
DesdequehámuitospossíveisvizinhosnosEthernet,okeepalivenoestáprojetadodeterminarseotrajetoaqualquerumvizinhoespecíficonofioestádisponível.
Projeta-sesomentecertificar-sedosistemalocaltenhaoacessodeleituraegravaoaofiodosEthernetpróprio.
OroteadorproduzumpacotedeEthernetcomsecomooendereoMACdeorigemededestinoeumcódigotipodeEthernetespecialde0x9000.
OhardwaredeEthernetenviaestepacotenofiodosEtherneteentorecebeimediatamenteestapartetraseiradopacoteoutravez.
IstoverificaohardwaredeemissoedereceponoadaptadordoEtherneteaintegridadebásicadofio.
InterfacesseriaisAsinterfacesserialpodemtertiposdiferentesdeencapsulamentosecadatipodeencapsulamentodeterminaotipodoKeepalivesqueseráusado.
InscrevaocomandokeepalivenomododeconfiguraodainterfaceafimajustarafrequênciaemqueumroteadorenviapacotesECHOREQaseupar:Afimrestaurarosistemaaointervalokeepalivedopadrodossegundos10,inscrevaocomandokeepalivecomnenhumapalavra-chave.
qAfimdesabilitaroKeepalives,inscrevaocomandodisabledokeepalive.
qNota:keepaliveOcomandoaplica-seàsinterfacesserialqueusamolinkdedadosdenívelelevadoContol(HDLC)ouoencapsulamentoPPP.
NoseaplicaàsinterfacesserialqueusamoEncapsulamentoframerelay.
Nota:ParaoPPPeostiposdoencapsulamentodeHDLC,umkeepalivedezerodesabilitaoKeepaliveseérelatadonocomandoshowrunning-configoutputcomoodesabilitaodokeepalive.
ManutenesdeatividadedeHDLCUmoutromecanismokeepaliveconhecidoémanutenesdeatividadeserialparaoHDLC.
AsmanutenesdeatividadeserialsoenviadasparaafrenteeparatrásentredoisRoteadoreseoKeepalivessoreconhecidos.
Comousodosnúmerosdesequênciaseguircadakeepalive,cadadispositivopodeconfirmarseéparHDLCrecebeuokeepalivequeenviou.
ParaoencapsulamentodeHDLC,trêsKeepalivesignoradosfazemcomquearelaosejaderrubada.
PermitaocomandodebugserialinterfaceparaumaconexodeHDLCafimpermitirqueousuárioveroKeepalivesqueégeradoeenviado:SampleOutput:17:21:09.
685:Serial0/0:HDLCmyseq0,mineseen0*,yourseen1,lineupAsmanutenesdeatividadedeHDLCcontêmtrêspartesafimdeterminá-lotrabalham:O"myseq"queénossopróprionúmerodeincremento.
qO"mineseen"queérealmenteumreconhecimentodooutrolado(incrementado)quedizqueesperaestenúmerodenós.
q"Yourseen"queénossoreconhecimentoaooutrolado.
qNota:Quandoadiferenanosvaloresnoscamposdomyseqedomineseenexcedetrêsnoroteador2,alinhavaiparabaixoearelaoérestaurada.
DesdequeasmanutenesdeatividadedeHDLCsotipoKeepalivesECHOREQ,afrequênciadekeepaliveéimportanteerecomenda-sequecombinamacimaexatamenteemambososlados.
Seostemporizadoressoforadasincronizao,osnúmerosdesequênciacomeamsairdaordem.
Porexemplo,sevocêajustaumladoaossegundos10eooutroa25segundos,aindapermitiráarelaopermaneaacimaenquantoadiferenanafrequêncianoésuficienteparafazercomqueosnúmerosdesequênciaestejamporumadiferenadetrês.
ComoumailustraodecomoasmanutenesdeatividadedeHDLCtrabalham,oroteador1eoroteador2soconectadosdiretamenteatravésdoSerial0/0edoSerial2/0respectivamente.
AfimilustrarcomooKeepalivesfalhadoHDCLéusadoparaseguirosestadosdarelao,oSerial0/0seráfechadonoroteador1.
Roteador1Router1#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisup(connected)HardwareisHD64570Internetaddressis10.
0.
0.
1/8MTU1500bytes,BW64Kbit,DLY20000usec,rely255/255,load1/255EncapsulationHDLC,loopbacknotset,keepaliveset(10sec)[outputisomited]17:21:09.
685:Serial0/0:HDLCmyseq0,mineseen0*,yourseen1,lineup17:21:19.
725:Serial0/0:HDLCmyseq1,mineseen1*,yourseen2,lineup17:21:29.
753:Serial0/0:HDLCmyseq2,mineseen2*,yourseen3,lineup17:21:39.
773:Serial0/0:HDLCmyseq3,mineseen3*,yourseen4,lineup17:21:49.
805:Serial0/0:HDLCmyseq4,mineseen4*,yourseen5,lineup17:21:59.
837:Serial0/0:HDLCmyseq5,mineseen5*,yourseen6,lineup17:22:09.
865:Serial0/0:HDLCmyseq6,mineseen6*,yourseen7,lineup17:22:19.
905:Serial0/0:HDLCmyseq7,mineseen7*,yourseen8,lineup17:22:29.
945:Serial0/0:HDLCmyseq8,mineseen8*,yourseen9,lineupRouter1(config-if)#shut17:22:39.
965:Serial0/0:HDLCmyseq9,mineseen9*,yourseen10,lineup17:22:42.
225:%LINK-5-CHANGED:InterfaceSerial0/0,changedstatetoadministrativelydown17:22:43.
245:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial0/0,changedstatetodownRoteador2Router2#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisup(connected)HardwareisHD64570Internetaddressis10.
0.
0.
2/8MTU1500bytes,BW64Kbit,DLY20000usec,rely255/255,load1/255EncapsulationHDLC,loopbacknotset,keepaliveset(10sec)[outputisomited]17:21:04.
929:Serial2/0:HDLCmyseq0,mineseen0,yourseen0,lineup17:21:14.
941:Serial2/0:HDLCmyseq1,mineseen1*,yourseen1,lineup17:21:24.
961:Serial2/0:HDLCmyseq2,mineseen2*,yourseen2,lineup17:21:34.
981:Serial2/0:HDLCmyseq3,mineseen3*,yourseen3,lineup17:21:45.
001:Serial2/0:HDLCmyseq4,mineseen4*,yourseen4,lineup17:21:55.
021:Serial2/0:HDLCmyseq5,mineseen5*,yourseen5,lineup17:22:05.
041:Serial2/0:HDLCmyseq6,mineseen6*,yourseen6,lineup17:22:15.
061:Serial2/0:HDLCmyseq7,mineseen7*,yourseen7,lineup17:22:25.
081:Serial2/0:HDLCmyseq8,mineseen8*,yourseen8,lineup17:22:35.
101:Serial2/0:HDLCmyseq9,mineseen9*,yourseen9,lineup17:22:45.
113:Serial2/0:HDLCmyseq10,mineseen10*,yourseen10,lineup17:22:55.
133:Serial2/0:HDLCmyseq11,mineseen10,yourseen10,lineup17:23:05.
153:HD(0):Resetfrom0x20375817:23:05.
153:HD(0):AssertingDTR17:23:05.
153:HD(0):AssertingDTRandRTS17:23:05.
153:Serial2/0:HDLCmyseq12,mineseen10,yourseen10,lineup17:23:15.
173:HD(0):Resetfrom0x20375817:23:15.
173:HD(0):AssertingDTR17:23:15.
173:HD(0):AssertingDTRandRTS17:23:15.
173:Serial2/0:HDLCmyseq13,mineseen10,yourseen10,linedown17:23:16.
201:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial2/0,changedstatetodownRouter2#17:23:25.
193:Serial2/0:HDLCmyseq14,mineseen10,yourseen10,linedownManutenesdeatividadedePPPAsmanutenesdeatividadedePPPsoumpoucodiferentesdasmanutenesdeatividadedeHDLC.
AocontráriodoHDLC,asmanutenesdeatividadedePPPsomaiscomosibilos.
Osambososladospodemsibilar-seemseulazer.
OmovimentonegociadoapropriadoéresponderSEMPREaeste"sibilo".
AssimparamanutenesdeatividadedePPP,afrequênciaouovalordetemporizadorsosomentelocalmenterelevanteenotêmnenhumimpactonooutrolado.
MesmoseumladodesligaoKeepalives,aindaRESPONDER2aquelasrequisiesdeecodoladoquetemumtemporizadordekeepalive.
Contudo,nuncainiciaráalgumadoseuspróprios.
PermitaocomandodebugppppacketparaumaconexoPPPafimpermitirqueousuárioverasmanutenesdeatividadedePPPquesoenviadas:Router2#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisup(connected)HardwareisHD64570Internetaddressis10.
0.
0.
2/8MTU1500bytes,BW64Kbit,DLY20000usec,rely255/255,load1/255EncapsulationHDLC,loopbacknotset,keepaliveset(10sec)[outputisomited]17:21:04.
929:Serial2/0:HDLCmyseq0,mineseen0,yourseen0,lineup17:21:14.
941:Serial2/0:HDLCmyseq1,mineseen1*,yourseen1,lineup17:21:24.
961:Serial2/0:HDLCmyseq2,mineseen2*,yourseen2,lineup17:21:34.
981:Serial2/0:HDLCmyseq3,mineseen3*,yourseen3,lineup17:21:45.
001:Serial2/0:HDLCmyseq4,mineseen4*,yourseen4,lineup17:21:55.
021:Serial2/0:HDLCmyseq5,mineseen5*,yourseen5,lineup17:22:05.
041:Serial2/0:HDLCmyseq6,mineseen6*,yourseen6,lineup17:22:15.
061:Serial2/0:HDLCmyseq7,mineseen7*,yourseen7,lineup17:22:25.
081:Serial2/0:HDLCmyseq8,mineseen8*,yourseen8,lineup17:22:35.
101:Serial2/0:HDLCmyseq9,mineseen9*,yourseen9,lineup17:22:45.
113:Serial2/0:HDLCmyseq10,mineseen10*,yourseen10,lineup17:22:55.
133:Serial2/0:HDLCmyseq11,mineseen10,yourseen10,lineup17:23:05.
153:HD(0):Resetfrom0x20375817:23:05.
153:HD(0):AssertingDTR17:23:05.
153:HD(0):AssertingDTRandRTS17:23:05.
153:Serial2/0:HDLCmyseq12,mineseen10,yourseen10,lineup17:23:15.
173:HD(0):Resetfrom0x20375817:23:15.
173:HD(0):AssertingDTR17:23:15.
173:HD(0):AssertingDTRandRTS17:23:15.
173:Serial2/0:HDLCmyseq13,mineseen10,yourseen10,linedown17:23:16.
201:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial2/0,changedstatetodownRouter2#17:23:25.
193:Serial2/0:HDLCmyseq14,mineseen10,yourseen10,linedownerespostasquesorecebidas:Router2#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisup(connected)HardwareisHD64570Internetaddressis10.
0.
0.
2/8MTU1500bytes,BW64Kbit,DLY20000usec,rely255/255,load1/255EncapsulationHDLC,loopbacknotset,keepaliveset(10sec)[outputisomited]17:21:04.
929:Serial2/0:HDLCmyseq0,mineseen0,yourseen0,lineup17:21:14.
941:Serial2/0:HDLCmyseq1,mineseen1*,yourseen1,lineup17:21:24.
961:Serial2/0:HDLCmyseq2,mineseen2*,yourseen2,lineup17:21:34.
981:Serial2/0:HDLCmyseq3,mineseen3*,yourseen3,lineup17:21:45.
001:Serial2/0:HDLCmyseq4,mineseen4*,yourseen4,lineup17:21:55.
021:Serial2/0:HDLCmyseq5,mineseen5*,yourseen5,lineup17:22:05.
041:Serial2/0:HDLCmyseq6,mineseen6*,yourseen6,lineup17:22:15.
061:Serial2/0:HDLCmyseq7,mineseen7*,yourseen7,lineup17:22:25.
081:Serial2/0:HDLCmyseq8,mineseen8*,yourseen8,lineup17:22:35.
101:Serial2/0:HDLCmyseq9,mineseen9*,yourseen9,lineup17:22:45.
113:Serial2/0:HDLCmyseq10,mineseen10*,yourseen10,lineup17:22:55.
133:Serial2/0:HDLCmyseq11,mineseen10,yourseen10,lineup17:23:05.
153:HD(0):Resetfrom0x20375817:23:05.
153:HD(0):AssertingDTR17:23:05.
153:HD(0):AssertingDTRandRTS17:23:05.
153:Serial2/0:HDLCmyseq12,mineseen10,yourseen10,lineup17:23:15.
173:HD(0):Resetfrom0x20375817:23:15.
173:HD(0):AssertingDTR17:23:15.
173:HD(0):AssertingDTRandRTS17:23:15.
173:Serial2/0:HDLCmyseq13,mineseen10,yourseen10,linedown17:23:16.
201:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial2/0,changedstatetodownRouter2#17:23:25.
193:Serial2/0:HDLCmyseq14,mineseen10,yourseen10,linedownAsmanutenesdeatividadedePPPcontêmtrêspartes:NúmerodeID-usadoparaidentificaraqueoECHOREQoparresponde.
qTipokeepalive-OECHOREQéKeepalivesenviadopelodispositivodeorigemeoqECHOREPérespostasenviadaspelopar.
Númerosmágicos-asnotificaesincluemosnúmerosmágicosdoserveredoclienteremoto.
OparvalidaonúmeromágiconopacotederequisiodeecoLCP,etransmiteopacotederespostadeecocorrespondenteLCPquecontémonúmeromágiconegociadopeloroteador.
qParaoencapsulamentoPPP,cincoKeepalivesignoradosfazemcomquearelaosejaderrubadaInterfacesdotúnelGREOmecanismokeepalivedotúnelGREélevementediferentedoqueparaEthernetouinterfacesserial.
DáacapacidadeparaqueumladoorigineerecebapacoteskeepaliveaedeumroteadorremotomesmoseoroteadorremotonoapoiamanutenesdeatividadedeGRE.
DesdequeoGREéummecanismodetunelamentodopacoteparaescavarumtúneloIPdentrodoIP,umpacotedotúnelIPGREpodeserconstruídodentrodeumoutropacotedotúnelIPGRE.
ParamanutenesdeatividadedeGRE,asPRE-construesdoremetenteopacotedarespostadekeepalivedentrodopacotederequisiodokeepaliveoriginaldemodoqueasnecessidadesdaextremidaderemotasomentedefazerodesencapsulamentoGREpadrodocabealhoIPexteriorGREeenviamentoopacoteGREinternoIP.
Estemecanismofazcomquearespostadekeepaliveenvieparaforaainterfacefísicaumpoucodoqueainterfacedetúnel.
ParamaisdetalhesaotrabalhardoKeepalivesdotúnelGRE,vejacomoasmanutenesdeatividadedeGREtrabalham.
KeepalivescriptoKeepalivesdeIKEOKeepalivesdoInternetKeyExchange(IKE)éummecanismousadoparadeterminarseumparVPNpodeascendenteereceberotráfegocriptografado.
OKeepalivescriptoseparadoéexigidoalémdoquekeepalivesdeinterfaceporqueosparesVPNgeralmentesoconectadosnuncadevoltaàpartetraseira,assimqueoskeepalivesdeinterfacenofornecembastanteinformaosobreoestadodoparVPN.
EmdispositivosIOSCisco,oskeepalivesdeIKEsopermitidospelousodeummétodoproprietáriochamadooDeadPeerDetection(DPD).
AfimpermitirqueogatewayenvieDPDaopar,incorporeestecomandoaomododeconfiguraoglobal:cryptoisakmpkeepaliveseconds[retry-seconds][periodic|on-demand]AfimdesabilitaroKeepalives,use"no"oformuláriodestecomando.
Paraobtermaisinformaessobredoquecadapalavra-chavenestecomandofaz,vejaokeepalivecriptodoisakmp.
Paramaisgranularidade,oKeepalivespodeigualmenteserconfiguradosoboperfilISAKMP.
Paramaisdetalhes,vejao[CiscoIOSIPsec]davistageraldoperfilISAKMP.
KeepalivesNATEmcasodasencenaesondeumparVPNestáatrásdeumNetworkAddressTranslation(NAT),NAT-Traversaléusadoparaacriptografia.
Contudo,duranteperíodosociososépossívelqueaentradaNATnodispositivoascendentepdecronometrarparafora.
IstopodecausarproblemasquandovocêtrazacimaotúneleoNATnoébidirecional.
OKeepalivesNATépermitidoafimmanterotraodinmicoNATvivoduranteumaconexoentredoispares.
OKeepalivesNATépacotesdeUDPcomumpayloadunencrypteddeumbyte.
EmboraaaplicaoatualDPDsejasimilaraoKeepalivesNAT,háumapequenadiferena-oDPDestáusadoparadetectarostatusdepeerquandooKeepalivesNATforenviadoseaentidadedoIPsecnoenviounemrecebeuopacoteemumperíododetempoespecificado.
Ointervaloválidoestáentre5a3600segundos.
Dica:SeoKeepalivesNATestápermitido(atravésdocomandokeepalivenatdoisamkpcripto),osusuáriosdevemassegurar-sedequeovalorinativosejamaiscurtodoqueotempodeexpiraodomapeamentoNATde20segundos.
Paraobtermaisinformaessobredestacaracterística,vejaatransparênciadeNATdoIPsec.
InformaesdeApoioOsmensagensdekeepalivesoenviadosporumdispositivoderedeatravésdeumexameoudeunscircuitosvirtuaisafiminformaraindaumoutrodispositivoderedeesseocircuitoentreelesfunes.
ParaqueoKeepalivestrabalhehádoisfatoresessenciais:Ointervalokeepaliveéoperíododetempoentrecadamensagemdekeepalivequeéenviadoporumdispositivoderede.
Istoésempreconfigurável.
qAsnovastentativasdokeepalivesoonúmerodevezesqueodispositivocontinuaaenviarapacoteskeepalivesemrespostaantesqueoestadoestejamudadoa"parabaixo".
ParaalgunstiposdeKeepalivesistoéconfigurável,quandoparaoutrohouverumvalorpadroquenopossasermudado.
qMecanismosdokeepalivedeinterfaceInterfacesdeEthernetEmmeiosdetransmissotaiscomoumEthernet,oKeepalivesélevementeoriginal.
DesdequehámuitospossíveisvizinhosnosEthernet,okeepalivenoestáprojetadodeterminarseotrajetoaqualquerumvizinhoespecíficonofioestádisponível.
Projeta-sesomentecertificar-sedosistemalocaltenhaoacessodeleituraegravaoaofiodosEthernetpróprio.
OroteadorproduzumpacotedeEthernetcomsecomooendereoMACdeorigemededestinoeumcódigotipodeEthernetespecialde0x9000.
OhardwaredeEthernetenviaestepacotenofiodosEtherneteentorecebeimediatamenteestapartetraseiradopacoteoutravez.
IstoverificaohardwaredeemissoedereceponoadaptadordoEtherneteaintegridadebásicadofio.
InterfacesseriaisAsinterfacesserialpodemtertiposdiferentesdeencapsulamentosecadatipodeencapsulamentodeterminaotipodoKeepalivesqueseráusado.
InscrevaocomandokeepalivenomododeconfiguraodainterfaceafimajustarafrequênciaemqueumroteadorenviapacotesECHOREQaseupar:Afimrestaurarosistemaaointervalokeepalivedopadrodossegundos10,inscrevaocomandokeepalivecomnenhumapalavra-chave.
qAfimdesabilitaroKeepalives,inscrevaocomandodisabledokeepalive.
qNota:keepaliveOcomandoaplica-seàsinterfacesserialqueusamolinkdedadosdenívelelevadoContol(HDLC)ouoencapsulamentoPPP.
NoseaplicaàsinterfacesserialqueusamoEncapsulamentoframerelay.
Nota:ParaoPPPeostiposdoencapsulamentodeHDLC,umkeepalivedezerodesabilitaoKeepaliveseérelatadonocomandoshowrunning-configoutputcomoodesabilitaodokeepalive.
ManutenesdeatividadedeHDLCUmoutromecanismokeepaliveconhecidoémanutenesdeatividadeserialparaoHDLC.
AsmanutenesdeatividadeserialsoenviadasparaafrenteeparatrásentredoisRoteadoreseoKeepalivessoreconhecidos.
Comousodosnúmerosdesequênciaseguircadakeepalive,cadadispositivopodeconfirmarseéparHDLCrecebeuokeepalivequeenviou.
ParaoencapsulamentodeHDLC,trêsKeepalivesignoradosfazemcomquearelaosejaderrubada.
PermitaocomandodebugserialinterfaceparaumaconexodeHDLCafimpermitirqueousuárioveroKeepalivesqueégeradoeenviado:SampleOutput:17:21:09.
685:Serial0/0:HDLCmyseq0,mineseen0*,yourseen1,lineupAsmanutenesdeatividadedeHDLCcontêmtrêspartesafimdeterminá-lotrabalham:O"myseq"queénossopróprionúmerodeincremento.
qO"mineseen"queérealmenteumreconhecimentodooutrolado(incrementado)quedizqueesperaestenúmerodenós.
q"Yourseen"queénossoreconhecimentoaooutrolado.
qNota:Quandoadiferenanosvaloresnoscamposdomyseqedomineseenexcedetrêsnoroteador2,alinhavaiparabaixoearelaoérestaurada.
DesdequeasmanutenesdeatividadedeHDLCsotipoKeepalivesECHOREQ,afrequênciadekeepaliveéimportanteerecomenda-sequecombinamacimaexatamenteemambososlados.
Seostemporizadoressoforadasincronizao,osnúmerosdesequênciacomeamsairdaordem.
Porexemplo,sevocêajustaumladoaossegundos10eooutroa25segundos,aindapermitiráarelaopermaneaacimaenquantoadiferenanafrequêncianoésuficienteparafazercomqueosnúmerosdesequênciaestejamporumadiferenadetrês.
ComoumailustraodecomoasmanutenesdeatividadedeHDLCtrabalham,oroteador1eoroteador2soconectadosdiretamenteatravésdoSerial0/0edoSerial2/0respectivamente.
AfimilustrarcomooKeepalivesfalhadoHDCLéusadoparaseguirosestadosdarelao,oSerial0/0seráfechadonoroteador1.
Roteador1Router1#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisup(connected)HardwareisHD64570Internetaddressis10.
0.
0.
1/8MTU1500bytes,BW64Kbit,DLY20000usec,rely255/255,load1/255EncapsulationHDLC,loopbacknotset,keepaliveset(10sec)[outputisomited]17:21:09.
685:Serial0/0:HDLCmyseq0,mineseen0*,yourseen1,lineup17:21:19.
725:Serial0/0:HDLCmyseq1,mineseen1*,yourseen2,lineup17:21:29.
753:Serial0/0:HDLCmyseq2,mineseen2*,yourseen3,lineup17:21:39.
773:Serial0/0:HDLCmyseq3,mineseen3*,yourseen4,lineup17:21:49.
805:Serial0/0:HDLCmyseq4,mineseen4*,yourseen5,lineup17:21:59.
837:Serial0/0:HDLCmyseq5,mineseen5*,yourseen6,lineup17:22:09.
865:Serial0/0:HDLCmyseq6,mineseen6*,yourseen7,lineup17:22:19.
905:Serial0/0:HDLCmyseq7,mineseen7*,yourseen8,lineup17:22:29.
945:Serial0/0:HDLCmyseq8,mineseen8*,yourseen9,lineupRouter1(config-if)#shut17:22:39.
965:Serial0/0:HDLCmyseq9,mineseen9*,yourseen10,lineup17:22:42.
225:%LINK-5-CHANGED:InterfaceSerial0/0,changedstatetoadministrativelydown17:22:43.
245:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial0/0,changedstatetodownRoteador2Router2#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisup(connected)HardwareisHD64570Internetaddressis10.
0.
0.
2/8MTU1500bytes,BW64Kbit,DLY20000usec,rely255/255,load1/255EncapsulationHDLC,loopbacknotset,keepaliveset(10sec)[outputisomited]17:21:04.
929:Serial2/0:HDLCmyseq0,mineseen0,yourseen0,lineup17:21:14.
941:Serial2/0:HDLCmyseq1,mineseen1*,yourseen1,lineup17:21:24.
961:Serial2/0:HDLCmyseq2,mineseen2*,yourseen2,lineup17:21:34.
981:Serial2/0:HDLCmyseq3,mineseen3*,yourseen3,lineup17:21:45.
001:Serial2/0:HDLCmyseq4,mineseen4*,yourseen4,lineup17:21:55.
021:Serial2/0:HDLCmyseq5,mineseen5*,yourseen5,lineup17:22:05.
041:Serial2/0:HDLCmyseq6,mineseen6*,yourseen6,lineup17:22:15.
061:Serial2/0:HDLCmyseq7,mineseen7*,yourseen7,lineup17:22:25.
081:Serial2/0:HDLCmyseq8,mineseen8*,yourseen8,lineup17:22:35.
101:Serial2/0:HDLCmyseq9,mineseen9*,yourseen9,lineup17:22:45.
113:Serial2/0:HDLCmyseq10,mineseen10*,yourseen10,lineup17:22:55.
133:Serial2/0:HDLCmyseq11,mineseen10,yourseen10,lineup17:23:05.
153:HD(0):Resetfrom0x20375817:23:05.
153:HD(0):AssertingDTR17:23:05.
153:HD(0):AssertingDTRandRTS17:23:05.
153:Serial2/0:HDLCmyseq12,mineseen10,yourseen10,lineup17:23:15.
173:HD(0):Resetfrom0x20375817:23:15.
173:HD(0):AssertingDTR17:23:15.
173:HD(0):AssertingDTRandRTS17:23:15.
173:Serial2/0:HDLCmyseq13,mineseen10,yourseen10,linedown17:23:16.
201:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial2/0,changedstatetodownRouter2#17:23:25.
193:Serial2/0:HDLCmyseq14,mineseen10,yourseen10,linedownManutenesdeatividadedePPPAsmanutenesdeatividadedePPPsoumpoucodiferentesdasmanutenesdeatividadedeHDLC.
AocontráriodoHDLC,asmanutenesdeatividadedePPPsomaiscomosibilos.
Osambososladospodemsibilar-seemseulazer.
OmovimentonegociadoapropriadoéresponderSEMPREaeste"sibilo".
AssimparamanutenesdeatividadedePPP,afrequênciaouovalordetemporizadorsosomentelocalmenterelevanteenotêmnenhumimpactonooutrolado.
MesmoseumladodesligaoKeepalives,aindaRESPONDER2aquelasrequisiesdeecodoladoquetemumtemporizadordekeepalive.
Contudo,nuncainiciaráalgumadoseuspróprios.
PermitaocomandodebugppppacketparaumaconexoPPPafimpermitirqueousuárioverasmanutenesdeatividadedePPPquesoenviadas:Router2#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisup(connected)HardwareisHD64570Internetaddressis10.
0.
0.
2/8MTU1500bytes,BW64Kbit,DLY20000usec,rely255/255,load1/255EncapsulationHDLC,loopbacknotset,keepaliveset(10sec)[outputisomited]17:21:04.
929:Serial2/0:HDLCmyseq0,mineseen0,yourseen0,lineup17:21:14.
941:Serial2/0:HDLCmyseq1,mineseen1*,yourseen1,lineup17:21:24.
961:Serial2/0:HDLCmyseq2,mineseen2*,yourseen2,lineup17:21:34.
981:Serial2/0:HDLCmyseq3,mineseen3*,yourseen3,lineup17:21:45.
001:Serial2/0:HDLCmyseq4,mineseen4*,yourseen4,lineup17:21:55.
021:Serial2/0:HDLCmyseq5,mineseen5*,yourseen5,lineup17:22:05.
041:Serial2/0:HDLCmyseq6,mineseen6*,yourseen6,lineup17:22:15.
061:Serial2/0:HDLCmyseq7,mineseen7*,yourseen7,lineup17:22:25.
081:Serial2/0:HDLCmyseq8,mineseen8*,yourseen8,lineup17:22:35.
101:Serial2/0:HDLCmyseq9,mineseen9*,yourseen9,lineup17:22:45.
113:Serial2/0:HDLCmyseq10,mineseen10*,yourseen10,lineup17:22:55.
133:Serial2/0:HDLCmyseq11,mineseen10,yourseen10,lineup17:23:05.
153:HD(0):Resetfrom0x20375817:23:05.
153:HD(0):AssertingDTR17:23:05.
153:HD(0):AssertingDTRandRTS17:23:05.
153:Serial2/0:HDLCmyseq12,mineseen10,yourseen10,lineup17:23:15.
173:HD(0):Resetfrom0x20375817:23:15.
173:HD(0):AssertingDTR17:23:15.
173:HD(0):AssertingDTRandRTS17:23:15.
173:Serial2/0:HDLCmyseq13,mineseen10,yourseen10,linedown17:23:16.
201:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial2/0,changedstatetodownRouter2#17:23:25.
193:Serial2/0:HDLCmyseq14,mineseen10,yourseen10,linedownerespostasquesorecebidas:Router2#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisup(connected)HardwareisHD64570Internetaddressis10.
0.
0.
2/8MTU1500bytes,BW64Kbit,DLY20000usec,rely255/255,load1/255EncapsulationHDLC,loopbacknotset,keepaliveset(10sec)[outputisomited]17:21:04.
929:Serial2/0:HDLCmyseq0,mineseen0,yourseen0,lineup17:21:14.
941:Serial2/0:HDLCmyseq1,mineseen1*,yourseen1,lineup17:21:24.
961:Serial2/0:HDLCmyseq2,mineseen2*,yourseen2,lineup17:21:34.
981:Serial2/0:HDLCmyseq3,mineseen3*,yourseen3,lineup17:21:45.
001:Serial2/0:HDLCmyseq4,mineseen4*,yourseen4,lineup17:21:55.
021:Serial2/0:HDLCmyseq5,mineseen5*,yourseen5,lineup17:22:05.
041:Serial2/0:HDLCmyseq6,mineseen6*,yourseen6,lineup17:22:15.
061:Serial2/0:HDLCmyseq7,mineseen7*,yourseen7,lineup17:22:25.
081:Serial2/0:HDLCmyseq8,mineseen8*,yourseen8,lineup17:22:35.
101:Serial2/0:HDLCmyseq9,mineseen9*,yourseen9,lineup17:22:45.
113:Serial2/0:HDLCmyseq10,mineseen10*,yourseen10,lineup17:22:55.
133:Serial2/0:HDLCmyseq11,mineseen10,yourseen10,lineup17:23:05.
153:HD(0):Resetfrom0x20375817:23:05.
153:HD(0):AssertingDTR17:23:05.
153:HD(0):AssertingDTRandRTS17:23:05.
153:Serial2/0:HDLCmyseq12,mineseen10,yourseen10,lineup17:23:15.
173:HD(0):Resetfrom0x20375817:23:15.
173:HD(0):AssertingDTR17:23:15.
173:HD(0):AssertingDTRandRTS17:23:15.
173:Serial2/0:HDLCmyseq13,mineseen10,yourseen10,linedown17:23:16.
201:%LINEPROTO-5-UPDOWN:LineprotocolonInterfaceSerial2/0,changedstatetodownRouter2#17:23:25.
193:Serial2/0:HDLCmyseq14,mineseen10,yourseen10,linedownAsmanutenesdeatividadedePPPcontêmtrêspartes:NúmerodeID-usadoparaidentificaraqueoECHOREQoparresponde.
qTipokeepalive-OECHOREQéKeepalivesenviadopelodispositivodeorigemeoqECHOREPérespostasenviadaspelopar.
Númerosmágicos-asnotificaesincluemosnúmerosmágicosdoserveredoclienteremoto.
OparvalidaonúmeromágiconopacotederequisiodeecoLCP,etransmiteopacotederespostadeecocorrespondenteLCPquecontémonúmeromágiconegociadopeloroteador.
qParaoencapsulamentoPPP,cincoKeepalivesignoradosfazemcomquearelaosejaderrubadaInterfacesdotúnelGREOmecanismokeepalivedotúnelGREélevementediferentedoqueparaEthernetouinterfacesserial.
DáacapacidadeparaqueumladoorigineerecebapacoteskeepaliveaedeumroteadorremotomesmoseoroteadorremotonoapoiamanutenesdeatividadedeGRE.
DesdequeoGREéummecanismodetunelamentodopacoteparaescavarumtúneloIPdentrodoIP,umpacotedotúnelIPGREpodeserconstruídodentrodeumoutropacotedotúnelIPGRE.
ParamanutenesdeatividadedeGRE,asPRE-construesdoremetenteopacotedarespostadekeepalivedentrodopacotederequisiodokeepaliveoriginaldemodoqueasnecessidadesdaextremidaderemotasomentedefazerodesencapsulamentoGREpadrodocabealhoIPexteriorGREeenviamentoopacoteGREinternoIP.
Estemecanismofazcomquearespostadekeepaliveenvieparaforaainterfacefísicaumpoucodoqueainterfacedetúnel.
ParamaisdetalhesaotrabalhardoKeepalivesdotúnelGRE,vejacomoasmanutenesdeatividadedeGREtrabalham.
KeepalivescriptoKeepalivesdeIKEOKeepalivesdoInternetKeyExchange(IKE)éummecanismousadoparadeterminarseumparVPNpodeascendenteereceberotráfegocriptografado.
OKeepalivescriptoseparadoéexigidoalémdoquekeepalivesdeinterfaceporqueosparesVPNgeralmentesoconectadosnuncadevoltaàpartetraseira,assimqueoskeepalivesdeinterfacenofornecembastanteinformaosobreoestadodoparVPN.
EmdispositivosIOSCisco,oskeepalivesdeIKEsopermitidospelousodeummétodoproprietáriochamadooDeadPeerDetection(DPD).
AfimpermitirqueogatewayenvieDPDaopar,incorporeestecomandoaomododeconfiguraoglobal:cryptoisakmpkeepaliveseconds[retry-seconds][periodic|on-demand]AfimdesabilitaroKeepalives,use"no"oformuláriodestecomando.
Paraobtermaisinformaessobredoquecadapalavra-chavenestecomandofaz,vejaokeepalivecriptodoisakmp.
Paramaisgranularidade,oKeepalivespodeigualmenteserconfiguradosoboperfilISAKMP.
Paramaisdetalhes,vejao[CiscoIOSIPsec]davistageraldoperfilISAKMP.
KeepalivesNATEmcasodasencenaesondeumparVPNestáatrásdeumNetworkAddressTranslation(NAT),NAT-Traversaléusadoparaacriptografia.
Contudo,duranteperíodosociososépossívelqueaentradaNATnodispositivoascendentepdecronometrarparafora.
IstopodecausarproblemasquandovocêtrazacimaotúneleoNATnoébidirecional.
OKeepalivesNATépermitidoafimmanterotraodinmicoNATvivoduranteumaconexoentredoispares.
OKeepalivesNATépacotesdeUDPcomumpayloadunencrypteddeumbyte.
EmboraaaplicaoatualDPDsejasimilaraoKeepalivesNAT,háumapequenadiferena-oDPDestáusadoparadetectarostatusdepeerquandooKeepalivesNATforenviadoseaentidadedoIPsecnoenviounemrecebeuopacoteemumperíododetempoespecificado.
Ointervaloválidoestáentre5a3600segundos.
Dica:SeoKeepalivesNATestápermitido(atravésdocomandokeepalivenatdoisamkpcripto),osusuáriosdevemassegurar-sedequeovalorinativosejamaiscurtodoqueotempodeexpiraodomapeamentoNATde20segundos.
Paraobtermaisinformaessobredestacaracterística,vejaatransparênciadeNATdoIPsec.
水墨云历史黑名单IDC，斟酌选购
水墨云怎么样?本站黑名单idc，有被删除账号风险，建议转出及数据备份!水墨云ink cloud Service是成立于2017年的商家，自2020起开始从事香港、日本、韩国、美国等地区CN2 GIA线路的虚拟服务器租赁，同时还有台湾、国内nat vps相关业务，也有iplc专线产品，相对来说主打的是大带宽服务器产品。注意：本站黑名单IDC，有被删除账号风险，请尽量避免，如果已经购买建议转出及数据备...
ShineServers（5美元/月）荷兰VPS、阿联酋VPS首月五折/1核1G/50GB硬盘/3TB流量/1Gbps带宽
优惠码50SSDOFF 首月5折50WHTSSD 年付5折15OFF 85折优惠，可循环使用荷兰VPSCPU内存SSD带宽IPv4价格购买1核1G50G1Gbps/3TB1个$ 9.10/月链接2核2G80G1Gbps/5TB1个$ 12.70/月链接2核3G100G1Gbps/7TB1个$ 16.30/月链接3核4G150G1Gbps/10TB1个$ 18.10/月链接阿联酋VPSCPU内存SS...
选择Vultr VPS主机不支持支付宝付款的解决方案
在刚才更新Vultr 新年福利文章的时候突然想到前几天有网友问到自己有在Vultr 注册账户的时候无法用支付宝付款的问题，当时有帮助他给予解决，这里正好顺带一并介绍整理出来。毕竟对于来说，虽然使用的服务器不多，但是至少是见过世面的，大大小小商家的一些特性特征还是比较清楚的。在这篇文章中，和大家分享如果我们有在Vultr新注册账户或者充值购买云服务器的时候，不支持支付宝付款的原因。毕竟我们是知道的，...
ios6 1 3为你推荐
-
淘宝客推广淘宝客推广有哪些途径最新qq空间代码QQ空间代码有哪些???云播怎么看片手机云播怎么用？中国论坛大全安徽论坛都有哪些？百度抢票浏览器百度浏览器怎么抢票？godaddygodaddy域名怎样使用硬盘人移动硬盘的优缺点qq怎么发邮件用QQ怎样发送文件开机滚动条开机滚动条要很长时间怎么解决？迅雷云点播账号求个迅雷VIP 是VIP就可以 只用来看云点播 改密码是孙子。 谢了 ！ 362135668@qq.com