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Hello all,

I have a capture file where i used wireshark to capture the skype voice chat between 3 persons. I need to measure the latency. That is the time a packet takes to travel from source to destination. How to go about seeing this?

Thank You Vin

asked 25 Jan '11, 14:59

magnetpest2k5's gravatar image

magnetpest2k5
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(After re-reading your question ;-) I think you have to go the Iperf or Jperf UDP test route in a client/server relationship. It's all about how accurately you can sync your timeclocks because UDP is connectionless. In TCP, you could measure the time between the SYN and SYN/ACK. If it was a VOIP call, you could analyze the RTP streams. Visualware has some good info on latency statistics as well as a UDP measurement called MyCapacity. But with UDP, you're kinda stuck. I have a skype trace file and did some graphing with frame.time_delta_displayed. It gives you a good picture of the delays but I don't think it's really accurate as far as a proper speedtest because of the timing issues. If you and your friends are using those nifty Mikrotik RB750s, you can do a UDP test with it's Btest.

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answered 25 Jan '11, 16:34

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RobertM
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edited 25 Jan '11, 17:39

Thank You for the information. I have one more question is there any way we can see the time stamps of the udp packets?

(26 Jan '11, 08:05) magnetpest2k5

I'm guessing you mean the timestamps of skype and not wiresharks timestamps? I don't have that trace with me right now but this should help: "Skype analysis"

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answered 26 Jan '11, 08:51

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RobertM
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edited 26 Jan '11, 08:52

Thank You that was informative. The article shows the departing time for voip packets. Can you tell me how can I get the departing time of packets in my case. Wireshark does show the arrival time of the captured packet but not the departure time.

(26 Jan '11, 12:22) magnetpest2k5
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question asked: 25 Jan '11, 14:59

question was seen: 9,540 times

last updated: 26 Jan '11, 12:22

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