8021x抓包详解

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1、8021x抓包详解.txt2008太不正常了，一切都不正常！在这个关键时刻，中国男足挺身而出，向全世界证明：中国男足还是正常的！1.当用户有上网需求时打开802.1X客户端程序，输入用户名和口令，发起连接请求。此时客户端程序将发出请求认证的报文给交换机，启动一次认证过程。如下：Frame90(64bytesonwire,64bytescaptured)ArrivalTime:Nov27,200616:27:33.446030000Timedeltafrompreviouspacket:3.105345000secondsTimesincereferenceorfirstfram

2、e:5.082965000secondsFrameNumber:90PacketLength:64bytesCaptureLength:64bytesEthernetII,Src:00:e0:4c:d7:65:cd,Dst:01:80:c2:00:00:03Destination:01:80:c2:00:00:03(Spanning-tree-(for-bridges)_03)Source:00:e0:4c:d7:65:cd(RealtekS_d7:65:cd)Type:802.1XAuthentication(0x888e)Trailer:A5A5A5A5A5A5A5A5A5

3、A5A5A5A5A5A5A5...Framechecksequence:0xa5a5a5a5(incorrect,shouldbe0xcc6d5b40)802.1xAuthenticationVersion:1Type:Start(1)Length:02.交换机在收到请求认证的数据帧后，将发出一个EAP-Request/Identitybaowe请求帧要求客户端程序发送用户输入的用户名。Frame91(64bytesonwire,64bytescaptured)ArrivalTime:Nov27,200616:27:33.447236000Timedeltafromprevio

4、uspacket:0.001206000secondsTimesincereferenceorfirstframe:5.084171000secondsFrameNumber:91PacketLength:64bytesCaptureLength:64bytesEthernetII,Src:00:03:0f:01:3a:5a,Dst:00:e0:4c:d7:65:cdDestination:00:e0:4c:d7:65:cd(RealtekS_d7:65:cd)Source:00:03:0f:01:3a:5a(DigitalC_01:3a:5a)Type:802.1XAuthe

5、ntication(0x888e)Trailer:A5A5A5A5A5A5A5A5A5A5A5A5A5A5A5A5...Framechecksequence:0xa5a5a5a5(incorrect,shouldbe0x7d263869)802.1xAuthenticationVersion:1Type:EAPPacket(0)Length:5ExtensibleAuthenticationProtocolCode:Request(1)Id:1Length:5Type:Identity[RFC3748](1)3.客户端程序响应交换机的请求，将包含用户名信息的一个EAP-Resp

6、onse/Identity送给交换机，交换机将客户端送来的数据帧经过封包处理后生成RADIUSAccess-Request报文送给认证服务器进行处理。Frame148(77bytesonwire,77bytescaptured)ArrivalTime:Nov27,200616:27:36.446199000Timedeltafrompreviouspacket:2.998963000secondsTimesincereferenceorfirstframe:8.083134000secondsFrameNumber:148PacketLength:77bytesCaptureL

7、ength:77bytesEthernetII,Src:00:e0:4c:d7:65:cd,Dst:01:80:c2:00:00:03Destination:01:80:c2:00:00:03(Spanning-tree-(for-bridges)_03)Source:00:e0:4c:d7:65:cd(RealtekS_d7:65:cd)Type:802.1XAuthentication(0x888e)802.1xAuthenticationVersion:1Type:EAPPacket(