This packet is labeled with a sequence number of 0x45 (Frame 00003), which tells. Information about itself, including its MAC (hardware) address in this frame. To verify, Sequence number plus 498 bytes of TCP payload equals 419452122. So when the next packet of this conversation is found, it must have a sequence number of 419452122, otherwise something is wrong (Wireshark Expert messages in quotes).
Hi, I can't understand the relation between packet and sequence, because when I go to analyse the RTP packets with the option RTP stream analysis, in the column paket starts the packet with the number 33 and the seq number with the number 38761, but if I continue analysing, in the packet 29146 has the number of sequence equal to 0. I attached a picture with two captures of the same analysis in order to be able to see what i want to say better. Another doubt that I have is: How I can know, in wich moment of the communication had a lost packet? Because with these analysis I can see that I have 5 packets lost, but I don't know in wich moment this happened. The RTP sequence number is a 16 bit value.
Packet Sequence_number For Mac Download
So, you will get an wrap-around at 65535 for a long session. That caused problems with all sorts of VoIP clients in the past. Because with these analysis I can see that I have 5 packets lost, but I don't know in wich moment this happened. Did you check the 'Expert Info'?
Analyze - Expert Info I'm not sure if the RTP dissector adds messages if it detects packet loss (if it detects it at all). If there is nothing in the Expert Info, you would have to analyze the RTP sequence number with an external script, by using tshark tshark -r input.cap -T fields -e frame.number -e rtp.seq Then analyze the output of tshark with a script to find lost packets (missing RTP sequence number). Regards Kurt. If you repeat the following steps, you will find the missing seq numbers pretty easily (you must have missed them in your analysis). Telephony - RTP - Show all Streams. Select the first stream (the one with the 15 lost packets) and click on the button Analyze In the pop-up window, click on the button Save as CSV and save the analysis into a file. Open the file with an editor and search for this string: Wrong sequence nr You will find the first entry at frame #1683.
This frame contains seq nr. The previous frame contains seq nr. 52491 and 52492 are missing in that sequence. Repeat the search until you have found all occurrences. Regards Kurt.