内容ipsec组件功能iscw10s04l01.pptx

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内容ipsec组件功能iscw10s04l01.pptx

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IPsecVPNsIPsecComponentsandIPsecVPNFeatures

IPsecOverview

WhatIsIPsec?IPsecisanIETFstandardthatemployscryptographicmechanismsonthenetworklayer:AuthenticationofeveryIPpacketVerificationofdataintegrityforeachpacketConfidentialityofpacketpayloadConsistsofopenstandardsforsecuringprivatecommunicationsScalesfromsmalltoverylargenetworksIsavailableinCiscoIOSsoftwareversion11.3(T)andlaterIsincludedinPIXFirewallversion5.0andlater

IPsecSecurityFeaturesIPsecistheonlystandardLayer3technologythatprovides:ConfidentialityDataintegrityAuthenticationReplaydetection

IPsecProtocolsIPsecusesthreemainprotocolstocreateasecurityframework:InternetKeyExchange(IKE):ProvidesframeworkfornegotiationofsecurityparametersEstablishmentofauthenticatedkeysEncapsulatingSecurityPayload(ESP):Providesframeworkforencrypting,authenticating,andsecuringofdataAuthenticationHeader(AH):Providesframeworkforauthenticatingandsecuringofdata

IPsecHeadersIPsecESPprovidesthefollowing:Authenticationanddataintegrity(MD5orSHA-1HMAC)withAHandESPConfidentiality(DES,3DES,orAES)onlywithESP

PeerAuthenticationPeerauthenticationmethods:UsernameandpasswordOTP(Pin/Tan)BiometricPresharedkeysDigitalcertificates

InternetKeyExchange

InternetKeyExchangeIKEsolvestheproblemsofmanualandunscalableimplementationofIPsecbyautomatingtheentirekeyexchangeprocess:SA特性的协商AutomatickeygenerationAutomatickeyrefreshManageablemanualconfiguration

IKEPhasesPhase1:AuthenticatethepeersNegotiateabidirectionalSAMainmodeoraggressivemodePhase1.5:XauthModeconfigPhase2:IPsecSAs/SPIsQuickmode

IKEModes

IKE:OtherFunctions

IKE:OtherFunctionsDeadpeerdetection(DPD):BidirectionalSentonperiodicintervalsSendermustreceiveareplyordisconnectIKEkeepalivesareunidirectionalandaresentevery10seconds.NATtraversal:DefinedinRFC3947EncapsulatesIPsecpacketin