How to Connect NordVPN and Isolate VPN Traffic on a Separate AP (Part 2)

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This is an advanced configuration. You should understand the OPNsense menus and have a recovery path before changing VPN routing.

See Part 1 — Add a VLAN and assign it to an interface .

II. Configure NordVPN on OPNsense

1. Configure the VPN client

Open System → Trust → Authorities, click +Add, and create a certificate authority.

Enter:

Descriptive Name: NordVPN_CA
Method: Import an existing Certificate Authority
Certificate data: paste the following certificate.

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-----BEGIN CERTIFICATE-----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==
-----END CERTIFICATE-----

Leave Certificate Private Key empty and keep Serial for next certificate at its default.

Screenshot

Click Save.

Open VPN → OpenVPN → Clients and click +Add.

General information:

Field	Value
Disabled	Leave unchecked
Description	For example `NordVPN_JP`
Server mode	Peer to Peer (SSL/TLS)
Protocol	UDP4, or TCP4 if required
Device mode	tun
Interface	VPN_LAN
Remote server	Get a hostname from https://nordvpn.com/servers/tools/ , for example `vn21.nordvpn.com`; use port 1194 for UDP or 443 for TCP
Retry DNS resolution	Checked
Proxy host / port	Empty
Proxy Authentication	None
Local port	Empty

User authentication:

Field	Value
Username/password	NordVPN username and password
Renegotiate time	Empty

Cryptographic settings:

Enable authentication of TLS packets: Enabled.
Disable automatic TLS-key generation and paste the static key below.

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-----BEGIN OpenVPN Static key V1-----
e685bdaf659a25a200e2b9e39e51ff03
0fc72cf1ce07232bd8b2be5e6c670143
f51e937e670eee09d4f2ea5a6e4e6996
5db852c275351b86fc4ca892d78ae002
d6f70d029bd79c4d1c26cf14e9588033
cf639f8a74809f29f72b9d58f9b8f5fe
fc7938eade40e9fed6cb92184abb2cc1
0eb1a296df243b251df0643d53724cdb
5a92a1d6cb817804c4a9319b57d53be5
80815bcfcb2df55018cc83fc43bc7ff8
2d51f9b88364776ee9d12fc85cc7ea5b
9741c4f598c485316db066d52db4540e
212e1518a9bd4828219e24b20d88f598
a196c9de96012090e333519ae18d3509
9427e7b372d348d352dc4c85e18cd4b9
3f8a56ddb2e64eb67adfc9b337157ff4
-----END OpenVPN Static key V1-----

Peer Certificate Authority: NordVPN_CA.
Client Certificate: None; username and password are used.
Encryption Algorithm: AES-256-CBC.
Auth Digest Algorithm: SHA512.
Hardware Crypto: No hardware acceleration.

Screenshot

Tunnel settings:

Field	Value
IPv4/IPv6 tunnel network	Empty
IPv4/IPv6 remote networks	Empty
Limit outgoing bandwidth	Empty
Compression	Enable with adaptive compression
Type-of-service	Unchecked
Disable IPv6	Checked if IPv6 is not used
Don't pull routes	Unchecked
Don't add/remove routes	Checked

Screenshot

Advanced configuration: paste:

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remote-random;
tun-mtu 1500;
tun-mtu-extra 32;
mssfix 1450;
persist-key;
persist-tun;
reneg-sec 0;
remote-cert-tls server;

Set Verbosity level to 3 or leave it at 1, then click Save.

2. Add an interface for the VPN

Open Interfaces → Assignments and click +. The interface is usually named ovpnc1.
Edit the new interface and enable it.

Field	Value
Description	NordVPN or another useful name
Block private networks	Unchecked
Block bogon networks	Unchecked
IPv4 Configuration Type	None
IPv6 Configuration Type	None
MAC / MTU / MSS	Empty

Leave DHCP client configuration unchanged. Click Save and Apply changes.

Screenshot

Configure the firewall and gateway

Open Firewall → NAT → Outbound and select Hybrid outbound NAT rule generation. Save and apply.
Under Firewall → Rules → VPN_LAN, edit Allow VPN_LAN network and select gateway NORDVPN_VPNV4 under Advanced features.
Add another rule with Source VPN_LAN net and Destination VPN_LAN Address, then save and apply.
Open System → Gateways → Single, edit NORDVPN_VPN6, disable it, and apply.
Open VPN → OpenVPN → Connection Status. The connection should show up.