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Every signal strength is 0dbm.

asked 2019-03-25 08:58:01 +0000

Every packet(802.11) signal strength is same(mostly 0dbm). What is the problem?

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On what operating system are you capturing, and what 802.11 adapter do you have?

Guy Harris gravatar imageGuy Harris ( 2019-03-25 20:51:39 +0000 )edit

My laptop doesn't support monitor mode, so i used iptime N150UA wireless card. And the os is windows10.

Honestree gravatar imageHonestree ( 2019-03-26 02:23:02 +0000 )edit

Just to share, iv tried on Windows 10 and installed Wireshark 3.0.1 for packet tracing. Monitor mode checkbox wasn't available and i have to purchase USB wifi adapter (TP-Link TLWN727N) to get the monitor mode to work. Same like yours, the signal strength is always 0dbm. Then, i read somewhere that monitor mode is platform/network adapter/driver dependent. Hence iv switch to Linux (Ubuntu 16.04.6) and im no longer receive 0dbm. Even the built-in Wi-Fi pci has the monitor mode in Linux. However, there is some command needed to activate the monitor mode in Ubuntu, in case you wonder this is what i follow and worked for me. 1) method 1 or 2) method 2

ts gravatar imagets ( 2019-05-02 22:20:12 +0000 )edit

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answered 2019-03-25 11:56:57 +0000

sindy gravatar image

updated 2019-03-25 11:57:20 +0000

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.

Guy Harris gravatar imageGuy Harris ( 2019-03-26 17:26:32 +0000 )edit

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Asked: 2019-03-25 08:58:01 +0000

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Last updated: Mar 25 '19