On Sun, 17 Oct 2021 13:47:13 -0700, Jeff Liebermann wrote:
>>Jeff - is there any (clever?) way to easily measure decibels of a bridge?
> Decibels is a ratio. My guess(tm) is what you want is transmit power
> output in dBm (decibels referenced to 1 milliwatt).
Luckily the dd-wrt firmware provides what it thinks is the transmit power of
the Linksys WRT54Gv8.1 wireless client bridge at
ddt-wrt:Status > Wireless > Wireless > Wireless Status >
TX Power = 70mW, Rate = 26Mbps
Given this conversion math, would you say the transmit is about -18dBm?
dBm = 10log(mW) = 10log(70) = 18.45 dBm
>>I have all the Android tools to measure signal strength of an access point.
>>But they don't seem to display the signal strength of the bridge itself.
> Yawn. SSH or telnet to the bridge IP using the the command line
> interface (CLI). The wl command should be available:
> wl cmds
> ws assoc or wl status
> wl rssi
> wl noise
> wl channel_qa and wl channel_qa_start
I had to turn on Remote Access at
Administration > Management > Remote Access >
Telnet Management = Enable (it was disabled by default)
Telnet Remote Port = 23
It took me a while to figure out _not_ to use the admin login and password.
Instead, the default _root_ login & password are used when telneting.
C:\> telnet 192.168.1.200
dd-wrt login: root
____ ___ __ ______ _____ ____ _ _
| _ \| _ \ \ \ / / _ \_ _| __ _|___ \| || |
|| | || ||____\ \ /\ / /| |_) || | \ \ / / __) | || |_
||_| ||_||_____\ V V / | _ < | | \ V / / __/|__ _|
|___/|___/ \_/\_/ |_| \_\|_| \_/ |_____| |_|
BusyBox v1.9.1 (2008-03-19 20:24:03 CET) built-in shell (ash)
Enter 'help' for a list of built-in commands.
\u@\h:\w\$ wl cmds
\u@\h:\w\$ ws assoc
-sh: ws: not found
\u@\h:\w\$ wl status
Mode: Managed RSSI: -84 dBm noise: -92 dBm Channel: 3
BSSID: 8C:3B:AD:A6:B2:55 Capability: ESS WEP
Supported Rates: [ 1(b) 2(b) 5.5(b) 6 9 11(b) 12 18 24 36 48 54 ]
\u@\h:\w\$ wl rssi
\u@\h:\w\$ wl noise
\u@\h:\w\$ wl channel_qa
\u@\h:\w\$ wl channel_qa_start
>>But what Android or Windows tools tell us the strength of the client bridge?
> I think I have a sniffer program for Android that will display signal
> level, SNR, data rate, etc in both directions by sniffing the traffic.
The Android sniffer needs to sniff things that aren't set up as an access
point but as a bridge, which is why the three sniffers I tried didn't show
the wireless client bridge traffic - those Android sniffers only showed the
APs of the Netgear home router (AFAICT).
> Later. I gotta sweep the roof, cover the wood piles, move the
> generator, and clean up the mess before it drizzles.
I hear it's windy up your way.