tshark splitting output files in Wireshark

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tshark splitting output files in Wireshark

tshark is a command-line network protocol analyzer, and it is included in the Wireshark package. You can use tshark to capture and analyze network traffic from the command line.

To split the output of tshark into multiple files based on various criteria, you can use the -b option followed by the splitting method and a value. Here are a few examples:

-b filesize:value - Split the output into files of size "value" (in KB). For example, -b filesize:1024 will split the output into files of 1 MB each.

-b duration:value - Split the output into files based on the duration of the capture. For example, -b duration:300 will split the output into files every 5 minutes.

-b packets:value - Split the output into files based on the number of packets captured. For example, -b packets:1000 will split the output into files every 1000 packets.

You can also use multiple -b options to split the output using multiple criteria. For example, -b filesize:1024 -b duration:300 will split the output into files every 1 MB or 5 minutes, whichever comes first.

Here is an example command that captures traffic on interface eth0 and splits the output into files of 1 MB each:

tshark -i eth0 -b filesize:1024 -w output.pcap

This will capture traffic on interface eth0 and write the output to multiple files with the prefix "output.pcap". The files will be named "output_00001.pcap", "output_00002.pcap", and so on, depending on the number of files created.