Template:Networking rutos configuration example openvpn bridge wifi ap use case

From Teltonika Networks Wiki

Configuration overview and prerequisites

Prerequisites:

  • Two RUTX routers
  • A Public Static or Public Dynamic IP address
  • An end device to configure the router (PC, Laptop, Tablet, Smartphone)

The topology above depicts the OpenVPN scheme. The router with the Public IP address (RUTX) acts as the OpenVPN server and other RUTX acts as client. OpenVPN connects the networks of HQ Office and Remote Office. Remote Office will also have a separate WiFi AP for guests.

When the scheme is realized, remote office workers will be able to reach HQ’s internal network with all internal systems by connecting to the router via LAN port or by connecting to a WiFi AP, which is used for work. All traffic apart guest WiFi is going to travel through VPN tunnel. Guest network traffic will go directly to WAN, it will give visitors access to the Internet connection, but nothing else making your company a lot more secure.

Configuring HQ office router

Before you start configuring the router turn on "Advanced WebUI" mode. You can do that by clicking the "Basic" button under "Mode", which is located at the top-right corner of the WebUI.

Note: You will need to do that in both, HQ and remote office routers.

OpenVPN

Generating Static key

Login to the router's WebUI, navigate to the Services → CLI page and do the following:

  1. Enter username root .
  2. Write the Password of your router.

Write the following commands to create OpenVPN Static key, which will be used for authentication: 

1) cd /etc/easy-rsa
2) openvpn --genkey --secret static.key

Extracting the key

Linux

If you are using a Linux-based OS, extracting files from the router is simple. Just go to the directory on your PC where you want to relocate the files, right click anywhere and choose the Open in Terminal option. In the Terminal command line use the Secure Copy (scp) command to copy the files from the router. The full command should look something like this: 

$ scp [email protected]:/etc/easy-rsa/static.key ./

The [email protected]:/etc/easy-rsa/static.key specifies the path to where the Static key is located (replace the IP address with your router's LAN IP); the ./ denotes that you want to copy the contents to the directory you are in at the moment.

Windows

If you are using Windows, you can copy files from the router using WinSCP, an Open source freeware SFTP, SCP and FTP client for Windows OS. Use the same login information with WinSCP as with CLI or SSH.

Please note: You must select SCP as File Protocol in WinSCP Session settings.

Once you've connected to the router with WinSCP, copying the files should be simple enough: just go to /etc/easy-rsa/, select the Static key file and drag it to directory on your PC where you would like to store it.

Configuring OpenVPN server

Go to Services → VPN → OpenVPN. There create a new configuration by writing New configuration name, selecting role Server and pressing Add button. It should appear after a few seconds. Then press Edit.

Now apply the following configuration:

  1. Enable instance.
  2. Set TUN/TAP to TAP (bridged).
  3. Enable LZO.
  4. Select Authentication: Static key.
  5. Add Keep alive interval: 10 120.
  6. Upload Static pre-shared key.
  7. Save the changes.

Configuring remote office router

Before you start configuring the remote office router, set a static IP address on the device you are configuring the router with (e.g. 192.168.1.10). You can find instructions on how to do that here:

Ubuntu

Windows

Note: make sure to switch back to automatic DNS and IP address obtaining when you are done configuring the router.

OpenVPN

LAN

Go to Network → Interfaces and press Edit next to your LAN interface:

Apply the following steps:

  1. Change your LAN IP address to: 192.168.1.2
  2. Disable DHCP.
  3. Save the changes.

Configuring OpenVPN client

Go to Services → VPN → OpenVPN. There create a new configuration by writing New configuration name (you can type anything you want), selecting role Client and pressing Add button. It should appear after a few seconds. Then press Edit.

Now apply the following configuration:

  1. Enable instance.
  2. Set TUN/TAP to TAP (bridged).
  3. Enable LZO.
  4. Select Authentication: Static key.
  5. Write Remote host/IP address (RUTX OpenVPN server public IP).
  6. Add Keep alive interval: 10 120.
  7. Upload Static pre-shared key.
  8. Save the changes.

Guest WiFi

Creating a new WiFi AP

Go to Network → Wireless. There create a new WiFi Access Point by pressing Add button (you can use either, 2.4GHz or 5GHz WiFi). Then you will be forwarded to the configuration window.

Apply the following steps:

  1. Disable LAN.
  2. Create a new Network for guest WiFi.
  3. Save the changes.

Now go to Network → Interfaces and press Edit next to your newly created LAN interface:

Apply the following steps:

  1. Set Protocol to Static.
  2. Press Switch Protocol and then more configuration options will appear.

Now apply the following steps:

  1. Set IPv4 Address to 192.168.5.1.
  2. Select IPv4 netmask: 255.255.255.0.
  3. Press Setup DHCP Server, after that more configuration options will appear, but you can leave those as default or change it to your own liking.
  4. Save the changes.

Editing Firewall rules

Navigate to Network → Firewall → General Settings. There create a new Zone rule by pressing Add button. Then you will be forwarded to the configuration window.

Now apply the following steps:

  1. At Covered Networks section select your newly created LAN interface.
  2. Set WAN at Allow Forward To Destination Zones section.
  3. Set WAN at Allow Forward From Destination Zones section.
  4. Save the changes.

Go to Network → Firewall → Traffic Rules. There create a new Forward rule by writing a Name, selecting Source Zone (newzone), Destination Zone (lan) and pressing Add button. Then you will be forwarded to the configuration window.

Now apply the following steps:

  1. Set Protocol to Any.
  2. Select Action: Drop.
  3. Save the changes.

Results

Remote office should now be able to access HQ network resources. To verify the connection you can ping remote RUTX (HQ server) LAN IP and if you get a reply, you have successfully connected to HQ‘s internal network. Also, all LAN addresses, that belong to the work network (192.168.1.0/24), should now be leased to LAN devices by HQ router.

In order to check the guest WiFi, you simply need to connect to the newly created WiFi AP, then check whether you have internet connectivity and try to ping OpenVPN server LAN IP - if everything is set up correctly, you should not be able to do that.

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