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how to capture udp traffic with a length of 94

On Windows,when i try this code using PowerShell to creat a pcap file then get unique ip address:

C:\Users\long> wireshark\tshark -i ethernet -a duration:60 -f "udp" -Y "frame.cap_len>=90 && frame.cap_len<=100" -w test3.pcap

Its doesn't work.I dont know why,Can u help me.Thank in advance

logn's avatar
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logn
asked 2018-05-14 08:56:13 +0000
grahamb's avatar
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grahamb
updated 2018-05-14 10:16:54 +0000
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It doesn't work as per the error message reported:

tshark: Display filters aren't supported when capturing and saving the captured packets

You can convert the display filter part (-Y ...) to a capture filter:

wireshark\tshark -i ethernet -a duration:60 -f "udp and len>=90 and len <=100" -w test3.pcap
grahamb's avatar
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grahamb
answered 2018-05-14 09:08:42 +0000
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grahamb's avatar grahamb (2018-05-14 09:17:45 +0000) edit
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