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I'm trying to use tshark to maintain a running history of all the packets that are going through an interface, for say 30 seconds. I want it to be human readable.

This is a linux machine, and without mucking too much into the netstack source (which I can do if push comes to shove), I was wondering if I can use tshark to this.

tshark has a -b duration:10 -b files:2 which I can use to generate a rotating set of 2 files, but I don't know which format it is printing the file in or how to read it.

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It is saving to the pcap format, read it with tshark, wireshark, tcpdump, etc. To read a file with tshark do a tshark -r filename.

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