This will guide you through the setup of OpenWRT on a Raspberry Pi 4.

• Download software from https://openwrt.org/toh/raspberry_pi_foundation/raspberry_pi
  • Model: Raspberry Pi 4
  • Version: B
  • For the above:
• Use balenaEtcher or other favorite tool to write OpenWRT onto SD card.
• See webpage info below for optional step of resizing the default partition.
• Put SD card in Pi, connect ethernet and power on.

• Go to http://192.168.1.1 and login using 'root' and 'openwrt' as default login.
• Set a new password by following the prompts.
• Change IP block.
  • Go to Network and choose Interfaces.
  • Edit the LAN
    • Protocol: Static address
    • Bring up on boot: checked
    • IPv4 address: 10.28.9.1
    • IPv4 netmask: 255.255.255.0
  • Save
• Save Apply and reconnect to new IP address with new password.
• From the top menu, click on Network and choose Wireless.
• Click Remove next to the existing wireless config and then Save & Apply.
• Click Scan to search for available networks, find your and click Join Selected.
• Enter your WiFi password in the WPA passphrase box and click Submit and then Save.
• Click Save & Apply to connect to your WiFi.
• You now have a WAN connection on the internal WiFi adapter and a LAN connection on the LAN port.
• Now add USB WiFi card as radio1 for our WiFi access point for clients to connect to.
• The Wifi card I have from a previous nonWifi Pi bundle seems compatable and may not require any extra install steps. See link below for more info if it does.
• From the top menu, click on the Network tab and choose Wireless.
• If you see radio1, you are all good with the installation of the second WiFi adapter.
• Click Edit for the OpenWrt SSID (under the radio1)
  • Click Enable for Wireless network is disabled
  • Change Operating Frequency to 7 or anything that is free
  • Under Interface Configuration, select the Wireless Security tab, choose WPA2-PSK and enter a password that devices will use to connect.
  • Click Save
• Click Save & Apply

Link: https://tristam.ie/2023/582/#openwrt-install

• From OpenWRT top menu, click System tab and choose Software.
• Click Update lists button and wait for process to finish.
• Click Dismiss
• Install the following packages by using the Filter field and clicking Install
  • kmod-wireguard
  • luci-proto-wireguard
  • luci-app-wireguard (Try installing this first, it should automatically install the others)
• Click Network→Interfaces→Add new interface.
  • enter wg0 as the interface name.
  • select WireGuard VPN from protocol drop down
  • click Create interface
• Click General Settings tab and enter following parameters from your Wireguard setup.
  • Bring up on boot: checked
  • Private Key: Generate new key pair
  • Public Key: this will go into your home wireguard setup on the other end as the peer's public key)
  • Listen Port: blank
  • IP Addresses: whatever you assign it in your home wireguard setup as the peer's ip (10.23.0.13/32)
• Click Advanced Settings tab
  • Use default gateway: checked
  • enter custom DNS servers (8.8.8.8 and 8.8.4.4)
• Click on the Firewall tab and select the WAN zone for Create/Assign firewall-zone. (wan wg0: wwan:)
• Click the Peers tab and Add peer
  • Description: brimble.com
  • Public Key: from the home wireguard instance setup
  • Private Key: blank
  • Preshared key: blank
  • Allowed IPs: 0.0.0.0/0
  • Route Allowed IPs: checked
  • Endpoint Host: brimble.com
  • Endpoint Port: 51820
  • Persistent Keep Alive: 25
  • Click Save and then Save & Apply.
• Also, set custom DNS again in Interfaces→WWAN if not already.

Link: https://tristam.ie/2023/805/

• Use laptop to connect to broadcasting WiFi
• go to 10.28.9.1 (or whatever your LAN is)
• go to network/wireless and remove whatever old wifi is under radio0
• click scan next to radio0 and connect to “hotel wifi”
• Should now be connected and devices connecting to your device should work.