How to Configure and Use NordVPN on OPNsense

If your router runs on OPNsense firmware, you may have a hard time installing NordVPN on it as the process is quite complicated. But fret not! We've provided a complete step-by-step guide to help you easily configure NordVPN on OPNsense. And this guide is applicable for all the routers running OPNsense version 19.1 or newer. So have a look.

1. First, visit the NordVPN website.

2. Next, click the Grab the Deal button and choose a VPN subscription on the upcoming page.

3. Now, enter your payment details to complete the purchase.

4. Once done, wait for a confirmation on your subscription.

5. As soon as you get that, click here to find out the right hostname for the VPN server in your preferred location.

NordVPN Server selection

6. Then, access OPNsense via your browser.

7. Next, navigate to System: Trust: Authorities and hit the +Add button.

8. Now, fill in the details mentioned below.

  • Descriptive Name: The server hostname
  • Method: Choose Import an existing Certificate Authority
  • Certificate data: Copy the below content and paste it here-
  • Certificate Private Key: Leave it blank
  • Serial for next certificate: Set it as default

9. Press the Save button next.

10. Now, navigate to VPN> OpenVPN> Clients and click the +Add button.

11. Then, fill in the information mentioned below.

General Information

  • Disabled: Unchecked
  • Description: Enter any name
  • Server mode: Choose Peer to Peer (SSL/TLS)
  • Protocol: Select UDP4 (you can also use TCP4);
  • Device mode: Choose tun
  • Interface: Set as any
  • Remote server:
  • Host or address: The hostname of the server you're going to use
  • Port: 1194 (use 443 in case you use TCP)
  • Retry DNS resolution: Check the box
  • Proxy host or address: Leave it blank
  • Proxy port: Leave blank
  • Proxy authentication extra options: Choose None
OPNsense router general information

User Authentication Settings

  • User name/pass:
  • Username: NordVPN service name
  • Password: NordVPN service password

You've to enter your NordVPN service credentials here. You can find that in your NordVPN online account dashboard; under Advanced configuration.

NordVPN service credentials
  • Renegotiate time: Blank
User Authentication Settings for NordVPN on OPNsense

Cryptographic Settings

  • TLS Authentication: Enabled - Authentication only
  • TLS Shared Key: Copy the content below and paste in this field-
-----BEGIN OpenVPN Static key V1-----
-----END OpenVPN Static key V1-----
  • Peer Certificate Authority: Choose the CA file available for your NordVPN browser
  • Client Certificate: Select None (Username and Password required);
  • Encryption Algorithm: AES-256-GCM
  • Auth Digest Algorithm: SHA512
Cryptographic Settings for NordVPN on OPNsense

Tunnel Settings

  • IPv4 tunnel network: Blank
  • IPv6 tunnel network: Blank
  • IPv4 remote network: Blank
  • IPv6 remote network: Blank
  • Limit outgoing bandwidth: Blank
  • Compression: Legacy - Disabled LZO algorithm (--comp-lzo no)
  • Type-of-service: Unchecked
  • Don’t pull routes: Unchecked
  • Don’t add/remove routes: Check the box
Tunnel Settings for NordVPN on OPNsense

Advanced Configuration

  • Advanced: Copy the below content and paste it into this section- 
tun-mtu 1500;
tun-mtu-extra 32;
mssfix 1450;
reneg-sec 0;
remote-cert-tls server;
  • Verbosity level: Set it to 3
Advanced configuration for NordVPN on OPNsense

12. Once done, click Save.

13. Navigate to Interfaces: Assignments and click the + button next to New Interface (It'll be ovpnc1 by default)

14. Click OPT1 now to edit the interface.

15. Next, click Enable Interface and make the following changes under General configuration:

  • Description: Anything you want
  • Block private networks: Unchecked
  • Block bogon networks: Unchecked
  • IPv4 Configuration Type: None
  • IPv6 Configuration Type: None
  • MAC address: Blank
  • MTU: Blank
  • MSS: Blank

16. No need to change the DHCP client configuration, so click Save.

Interface for NordVPN on OPNsense

17. Now, click the Apply changes button.

18. Navigate to Services; then click Unbound DNS, and go to General.

19. Next, fill in the details mentioned below.

  • Enable: Check
  • Listen port: 53
  • Network Interfaces: All
  • DNSSEC: Uncheck
  • DHCP Registration: Check
  • DHCP Domain Override: Blank
  • DHCP Static Mappings: Check
  • IPv6 Link-local: Unchecked
  • TXT Comment Support: Unchecked
  • DNS Query Forwarding: Check
  • Local Zone Type: Transparent
  • Custom options: Blank
  • Outgoing Network Interfaces: Name your OpenVPN interface
  • WPAD Records: Unchecked

20. Click the Save button next and choose Apply changes.

21. Navigate to Services> Unbound DNS> Advanced after that and check the following options:

  • Hide Identity
  • Hide Version
  • Prefetch Support
  • Prefetch DNS Key Support

22. Next, leave anything else at default and click Save, then Apply Settings.

23. Now, move to Firewall> NAT> Outbound and choose Hybrid outbound NAT rule generation (automatically generated rules are applied after manual rules).

24. Then, click Save and select Apply Changes.

25. You've to hit the +Add button at the top of the edit menu and choose Interface as NordVPN

26. Leave everything else at default and click Save, then choose Apply Changes.

27. Now, you need to move to Firewall> Rules> LAN and delete the IPv6 rule.

28. Click the edit button right beside IPv4 and move down to Advanced features next.

29. You've to select the Gateway as the NordVPN server name next and click the Save button.

30. After that, click the +Add button and change the Source to LAN net and Destination to LAN Address.

31. You don't need to change anything else; click the Save button and choose Apply Changes.  

32. Locate System> Settings> General next and make the following changes-

  • Under Networking, check the option, Prefer IPv4 over IPv6
  • DNS servers:
  •, Use gateway: none
  •, Use gateway: none
Networking set up to Use NordVPN on OPNsense

33. For DNS server options, uncheck the box next to Allow DNS server list to be overridden by DHCP/PPP on WAN.

34. Click the Save button next and choose Apply Changes.

35. Navigate to System> Gateways> Single next, edit the server name, and click Disabled

36. Then, click Save and choose Apply Changes

37. When done, navigate to VPN> OpenVPN> Connection Status; the service should be 'up.'

38. Now, restart the connection to assign OpenVPN Virtual Address to the interface

39. You can confirm that NordVPN has an IP number by moving to Lobby>Dashboard


That's all! Now you know how to configure and use NordVPN on OPNsense. If you have further queries, leave us a comment through the below button. Thanks for reading!

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