Every signal strength is 0dbm.
Every packet(802.11) signal strength is same(mostly 0dbm). What is the problem?
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It could be a Wireshark bug, but it is more likely that the wireless hardware or driver does not actually measure the signal strength or does not put the measured value into the capture. To tell between these two, click at the signal strength row in the dissection pane and look to the raw value in the packet dump (bottom-most pane). If the dissected value is always 0 while the raw values differ, it is a dissector bug; if the raw value is the same in all frames as well, it is a hardware or driver issue.
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I've opened an Npcap issue for this.
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On what operating system are you capturing, and what 802.11 adapter do you have?
My laptop doesn't support monitor mode, so i used iptime N150UA wireless card. And the os is windows10.