Where do you meassure? I guess you have wireshark running on the client machiene or a setup is like this:
client -> wireshark measuring point -> delaying mechanism -> server In this setup there will be no delay between events in client and as logged by wireshark The full delay will be when a pcaket travels through the delay mechanism If we assume your server is responding in 0 time then the delay (network latency) is 200ms At time 0 the SYN leaves the client and is logged by wireshark (packet 1). At time 0.2 this SYN arrives at the server, At time 0.2 this server returns a SYN,ACK At time 0.4 syn+ack arrives is received in client and is logged by wireshark (packet 2) At time 0.4 the client sends ACK and this is logged by wireshark (packet 3) At time 0.4 the client sends data and this is logged by wireshark (packet 4) Fits precisely the observed data /Rgds Lars On Thu, Aug 14, 2008 at 9:11 AM, Naveen Kumar Duniwal <[EMAIL PROTECTED]> wrote: > > Hi > > I am having a problem in understanding "time taken by 3 way handshake for > creation a TCP connection". Please look at following wireshark frames. > > No Time Source Destination > Protocol Info > > "1", "0.000000", "192.168.131.41", "192.168.133.157", > "TCP", "sacred > http [SYN] Seq=0 Win=65535 Len=0 MSS=1360" > > "2", "0.406250", "192.168.133.157", "192.168.131.41", > "TCP", "http > sacred [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 > MSS=1460" > > "3", "0.406250", "192.168.131.41", "192.168.133.157", > "TCP", "sacred > http [ACK] Seq=1 Ack=1 Win=65535 Len=0" > > "4", "0.406250", "192.168.131.41", "192.168.133.157", > "HTTP", "GET / HTTP/1.1" > > There is a network latency of 100ms set between my Source (192.168.131.41) > and Destination(192.168.133.157). Since this is a 3 step process so I > assumed that it will take atleast 100ms in each of the step , but the above > observation doesn't support it, where time diff between Ist and IInd frame > is around 400 ms and rest of the timestamps are same. > > Could you please advice me what I am doing wrong in this. > > Thanks in advance. > > Regards > Naveen > > _______________________________________________ > Wireshark-dev mailing list > [email protected] > https://wireshark.org/mailman/listinfo/wireshark-dev > > _______________________________________________ Wireshark-dev mailing list [email protected] https://wireshark.org/mailman/listinfo/wireshark-dev
