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I am running two TCPDUMP Commands back to back. Here is the sequence

  1. Run the below command

    root@open5Gs:/home/test# tcpdump -l -vvv -s0 -i any -B 4096 -nn -w /home/test/tc060.pcap -c 1500

  2. Execute Test Case

  3. Wait until tcpdump completes packet capture

root@open5Gs:/home/test# tcpdump -l -vvv -s0 -i any -B 4096 -nn -w  /home/test/tc060.pcap -c 1500
tcpdump: listening on any, link-type LINUX_SLL (Linux cooked v1), capture size 262144 bytes
1500 packets captured
2588 packets received by filter
0 packets dropped by kernel
  1. Execute command for Next Packet capture

tcpdump -l -vvv -s0 -i any -B 4096 -nn -w /home/test/tc078.pcap -c 1500

and repeat steps 1 to 3

The Problem I am seeing is as soon as back to back tcpdump command is run for the 2nd PCAP response code is not captured.

No Response Code available

But If I wait for some time after execution completion of first tcpdump and rerun the 2nd tcpdump command. I can see the response code

enter image description here

Can anyone help me to understand why this is happening? Why 2nd TCPDUMP command expecting a delay post execution of 1st tcpdump command execution

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  • Any help will be greatly appreciated. Commented Feb 21, 2023 at 15:41

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