As explained here, I built an Ethernet bridge using a Raspberry Pi 3b+.
As an extension, I am now trying to connect it to the internet via the Wifi interface.
For that I configured the wireless interface as shown here. Then I brought the wireless interface up using
ifconfig wlan0 up. When I run
ifconfig I can see the wlan0 interface in the list of interfaces (i.e. it's active). But it does not connect to a network.
I also noticed that when I make the changes provided in the first link, the complete networking capabilities (other than the bridge) of the RPi cease. (Although I am bridging only the two Ethernet interfaces)
Can someone please tell me what I am doing wrong?