How do I configure a network interface bridge from WiFi to Ethernet with Debian?
For configuring a bridge from ethernet to wifi, it is as simple as doing in your
auto eth0 allow-hotplug eth0 iface eth0 inet manual auto wlan0 allow-hotplug wlan0 iface wlan0 inet manual auto br0 iface br0 inet static bridge_ports eth0 wlan0 address 192.168.1.100 netmask 255.255.255.0
Replace the IP address with something more appropriate to your network.
If you prefer the IP attribution done via DHCP, change it to:
auto br0 iface br0 inet dhcp bridge_ports eth0 wlan0
/etc/network/interfaces, either restarting Debian or doing
service networking restart
Will activate this configuration.
You will have to make sure for this configuration to have
bridge-utils installed. You can install it with:
sudo apt install bridge-utils
For more information, see:
The wlan0 interface also has to be condigured to connect to your remote AP so this configuration is not be used verbatim.
Additional note: bridging eth0 and wlan0 together means in poor layman´s terms that br0 will present itself as a single logical interface englobing the interfaces that make part of the bridge. Usually such configuration is made when both extend or belong to the same network.