BSSID (Basic Service Set Identifier) defines the most basic infrastructure mode network, a BSS of a WAP and one or more wireless nodes. The scheme is so simple that the BSSID is left as the MAC address of the WAP. WiFI scanning tools scan the network very frequently. However, you can reduce that using a permanent BSSID.
If you set the BSSID for a particular WiFi connection, the network manager will not scan frequently for access points on that connection. However, this should only be done if you don’t switch networks a lot, for example, at home. In an office network, however, the access point may change between floors or across the same floor as well, if it’s large enough.
The BSSID is actually the MAC address of your router and you can find it out easily.
Run the following commend on Ubuntu:
sudo iwlist scanning wlan0 Scan completed : Cell 01 - Address: B8:D1:C2:07:D3:68 Channel:7 Frequency:2.442 GHz (Channel 7) Quality=53/70 Signal level=-57 dBm Encryption key:on ESSID:"HomeNetwork"
As you can see, in my case the BSSID is
To set the value, right click on the Network Manager icon in system tray ▸ Edit Connections… ▸ Select the WiFi connection ▸ Edit… ▸ Wi-Fi tab ▸ set BSSID field.