Is it possible to test the performance of a WiFi via the terminal?
Basically, I want to check how good WiFi is in some spaces of my home to figure out where to place a access points.
Can the terminal help me with that in any way?
You can use the built in
airport utility to measure SNR (Signal to Noise Ratio). It's found in
What I do is make a symlink to a directory in my path so I can call it without having to remember that long path:
ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport /usr/local/bin/airport
Assuming that you are connected to a WiFi network, issue the command:
to print out information of your current connection.
$ airport -I agrCtlRSSI: -65 agrExtRSSI: 0 agrCtlNoise: -90 agrExtNoise: 0 state: running op mode: station lastTxRate: 243 maxRate: 300 lastAssocStatus: 0 802.11 auth: open link auth: wpa2-psk BSSID: 82:2a:a9:45:f3:25 SSID: StackExchange WiFi Demo MCS: 14 channel: 157,1
To calculate SNR, you take the RSSI value and subtract the Noise value. In this case, I have an RSSI of -65dB and a Noise value of -90dB. Calculated, that gives me 25dB. Which is a very good signal (just barely but I am behind a reinforced concrete wall away from my AP; not bad actually considering.
That said..it's not all down to what your SNR is in a given location, you should also consider things like:
If you have too many WiFi networks competing for the same bandwidth or a combination of too many users or too many bandwidth hogs (everyone watching Netflix 4K on their tablets), this will greatly affect performance beyond what your SNR can tell you.
What I prefer to do is to deploy multiple APs around the house and turn down the transmit power so they don't go very far outside the room I am trying to cover. I personally use these PoE Access Points from Ubiquiti to cover several areas of my home with great success.