OpenWRT-Travel-Router

This repository contains a step-by-step guide on how to setup a Raspberry Pi 3 with 2 WiFi cards. One card connects to the desired WiFi, the other hosts a WiFI network for clients to join.

Initial Setup

Once OpenWRT is flashed on the SD card and the RPI is started, it require direct connection to your computer through the LAN cable. This is because OWRT is setup to create a network on the ethernet port with IP 192.168.1.1 : this IP and network are likely used by your existing router, so you won't be able to connect to it if you plug the ethernet cable into the PI and the existing router.

To fix this, you have 2 options:

• Connect the RPI to your laptop via ethernet
• Connect a screen to the RPI and change some configs

We'll go for the second one.

Fixing the ethernet

Log into the console by connecting keyboard and a screen to the Pi, then modify the lan config into /etc/config/network as follows:

config interface 'loopback'
	option device 'lo'
	option proto 'static'
	option ipaddr '127.0.0.1'
	option netmask '255.0.0.0'

config globals 'globals'
	option ula_prefix 'fd9b:9d35:ae65::/48'
	option packet_steering '1'

config device
	option name 'br-lan'
	option type 'bridge'
	list ports 'eth0'

config interface 'lan'
	option device 'br-lan'
	option proto 'dhcp'

Then make sure SSH is enabled, by checking /etc/config/dropbear config:

config dropbear main
        option enable '1'
        option PasswordAuth 'on'
        option RootPasswordAuth 'on'
        option Port         '22'
#       option BannerFile   '/etc/banner'

Once you reboot, the PI should be able to join your existing network. You should be able to SSH into it with root@<ip_addr>

Travel Router Setup

This setup comes from ChatGPT and the following question I asked

I have a raspberry pi with OpenWRT installed. The RPI has 2 wifi cards: the built-in one (radio0) and an external one (radio1). It is also connected to my home router through the LAN port, with IP 192.168.1.193 .

I can currently access the web interface through it's LAN IP 192.168.1.3 .

I want to setup OpenWRT such that:

• There is a wifi network provided by radio1 that has a gateway set on 10.71.71.1 and all other clients can connect to it and get a DHCP address in the range 10.71.71.50 - 10.71.71.100 . The wifi should be called 'Travel' .
• I want to be able to access the web interface to change the configuration from the network just created. So going to 10.71.71.1 should open the web interface of openwrt.

Chat GPT answer

To set up your Raspberry Pi with OpenWRT to create a Wi-Fi network using radio1 with the specified configurations, follow these steps:

Step 1: Access OpenWRT Web Interface

1. Open your web browser and go to http://192.168.1.193 to access the OpenWRT web interface.

Step 2: Configure radio1 for the 'Travel' Wi-Fi Network

1. Navigate to Network > Wireless.

2. Find the radio1 interface (the external Wi-Fi card) and click on Edit.

3. Set the following parameters:

   • ESSID: Travel
   • Mode: Access Point
   • Network: Create a new network (e.g., Travel).

4. Save & Apply the changes.

Step 3: Create a New Network for the 'Travel' Wi-Fi

1. Navigate to Network > Interfaces.

2. Click on Add new interface.

3. Set the following parameters:

   • Name: Travel
   • Protocol: Static address
   • Interface: Select the new network you created for radio1.

4. Click Submit.

Step 4: Configure the Static IP Address

1. Set the following parameters:

   • IPv4 address: 10.71.71.1
   • IPv4 netmask: 255.255.255.0
   • IPv4 gateway: Leave this blank (as this will be the gateway).
   • DNS server: You can set this to your home router's IP (e.g., 192.168.1.1) or any public DNS server (e.g., 8.8.8.8).

2. Save & Apply the changes.

Step 5: Configure DHCP for the 'Travel' Network

1. Navigate to Network > DHCP and DNS.

2. Scroll down to the DHCP Server section and find the Travel interface.

3. Enable the DHCP server and set the following parameters:

   • Start: 50
   • Limit: 51 (this will give you a range of 50 addresses, from 10.71.71.50 to 10.71.71.100)
   • Lease time: Set as desired (e.g., 12 hours).

4. Save & Apply the changes.

Step 6: Configure Firewall

1. Navigate to Network > Firewall.

2. Click on Add to create a new zone for the Travel network.

3. Set the following parameters:

   • Name: Travel
   • Input: Accept
   • Output: Accept
   • Forward: Reject
   • Covered networks: Select the Travel interface.

4. Save & Apply the changes.

Step 7: Allow Access to the Web Interface

1. In the same Firewall settings, go to the Traffic Rules section.

2. Click on Add to create a new rule.

3. Set the following parameters:

   • Name: Allow access to web interface
   • Source zone: Travel
   • Destination zone: Device
   • Destination port: 80 (for HTTP) and 443 (for HTTPS, if enabled).
   • Action: Accept

4. Save & Apply the changes.

Step 8: Finalize and Test

1. Reboot your Raspberry Pi to ensure all settings are applied correctly.
2. Connect a device to the Travel Wi-Fi network.
3. Check if you can access the OpenWRT web interface by navigating to http://10.71.71.1.

Troubleshooting

• If you cannot access the web interface, double-check the firewall rules and ensure that the DHCP server is functioning correctly.
• Ensure that the Wi-Fi network is broadcasting and that devices can connect to it.

By following these steps, you should have a functioning Wi-Fi network on your Raspberry Pi with OpenWRT, allowing you to access the web interface from the new network.

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Then I asked

Now, I want radio0 to connect to a wifi network and forward internet connection to the clients connected the Travel network thorugh radio1

Chat GPT answer

To configure your Raspberry Pi with OpenWRT so that radio0 connects to an existing Wi-Fi network and forwards the internet connection to clients connected to the Travel network via radio1, follow these steps:

Step 1: Connect radio0 to the Existing Wi-Fi Network

1. Navigate to Network > Wireless.

2. Find the radio0 interface (the built-in Wi-Fi card) and click on Edit.

3. Set the following parameters:

   • Mode: Client
   • ESSID: Enter the SSID of the Wi-Fi network you want to connect to.
   • Network: Create a new network (e.g., WAN).

4. Save & Apply the changes.

Step 2: Configure the WAN Interface

1. Navigate to Network > Interfaces.

2. Click on Add new interface.

3. Set the following parameters:

   • Name: WAN
   • Protocol: DHCP client (if the existing Wi-Fi network provides DHCP).
   • Interface: Select the new network you created for radio0.

4. Save & Apply the changes.

Step 3: Configure Firewall Zones

1. Navigate to Network > Firewall.

2. You should see the existing zones for Travel and WAN. If not, create a new zone for the WAN interface:

   • Click on Add.
   • Set the following parameters:
     • Name: WAN
     • Input: Reject
     • Output: Accept
     • Forward: Reject
     • Covered networks: Select the WAN interface.

3. Save & Apply the changes.

Step 4: Allow Forwarding from Travel to WAN

1. In the Firewall settings, go to the Traffic Rules section.

2. Click on Add to create a new rule.

3. Set the following parameters:

   • Name: Allow forwarding from Travel to WAN
   • Source zone: Travel
   • Destination zone: WAN
   • Action: Accept

4. Save & Apply the changes.

Step 5: Configure NAT (Network Address Translation)

1. Still in the Firewall settings, go to the General Settings tab.

2. Find the WAN zone and check the box for Masquerading. This will enable NAT for the WAN zone, allowing clients on the Travel network to access the internet.

3. Save & Apply the changes.

Step 6: Test the Configuration

1. Reboot your Raspberry Pi to ensure all settings are applied correctly.
2. Connect a device to the Travel Wi-Fi network.
3. Check if you can access the internet from the device connected to the Travel network.

Additional Notes

• If you encounter any issues, check the status of the WAN interface to ensure it is connected to the existing Wi-Fi network.
• You can also check the logs in the OpenWRT web interface under Status > System Log for any errors or connection issues.
• Make sure that the existing Wi-Fi network allows clients to connect and provides internet access.

If you have any questions or need further assistance, feel free to ask!

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Once this is done, make sure to unplug the ethernet cable (you won't be able to go to the internet otherwise). Then reboot

TODO

• AdGuard setup https://openwrt.org/docs/guide-user/services/dns/adguard-home
• Wifi cards used + driver install
• Resizing of disk (if necessary) openwrt/openwrt#7729
• Investigate Travelmate? https://forum.openwrt.org/t/travelmate-support-thread/5155