Relayd Wireless Bridge in OpenWRT

Sets up a wireless bridge in OpenWRT using relayd.

Steps:

Collect Info

Router WIFI SSID & password
Router IP address, subnet mask: Example 192.168.100.1 / 255.255.255.0
Choose an IP address in the router's subnet for the bridge: Example 192.168.100.4
Choose an IP address in a different subnet for the bridge lan (used to configure the bridge itself): Example 192.168.8.1

Set Bridge LAN IP Address

Menu -> Network -> Interfaces
LAN -> Click Edit
IPv4 address: Example 192.168.8.1
DHCP Server -> General Setup -> Ignore Interface [X]
Click Save & Apply
Configure client PC to manually use 192.168.8.x address on ethernet and reconnect

Connect Bridge to Router WLAN

Menu -> Network -> Wireless
Click Scan
Click Join Network
WPA passphrase: your wifi password
Click Submit
Click Save & Apply

Test Connection to Internet

Menu -> Network -> Diagnostics
Click Ping

Install Relayd

Menu -> System -> Software
Click Update lists
Filter: relay, Click Find Package
Look for luci-proto-relay and relayd
Check in installed packages - see if they're already installed.
Check in available packages - click Install

Add Bridge Interface

Menu -> Network -> Interfaces
Click Add new interface...
Name of the new interface: stabridge
Protocol of the new interface: Relay bridge
Click Submit
Relay between networks: lan: and wwan:
Local IPv4 Address: Example 192.168.100.1
Click 'Save and Apply'

Update LAN Interface

Menu -> Network -> Interfaces
LAN -> Click Edit
IPv4 Gateway: Example 192.168.100.1
Custom DNS: Example 192.168.100.1
DHCP: Ignore Interface [X]

Add Firewall Zone

Menu -> Network -> Firewall
Zones: Click Add
Name: bridgezone
Forward: accept
Covered networks: lan: and wwan:
Click 'Save and Apply'

Reboot bridge, change PC ethernet port back to automatic (DHCP)