Comments on: How to Setup an L2TP/IPsec VPN Client on Linux

By: Ravi Saive

Ravi Saive — Wed, 12 Feb 2025 04:42:06 +0000

In reply to K..

@Keith,

If the VPN server is behind a NAT device, ensure that NAT traversal (NAT-T) is enabled on both the server and the client. Windows typically handles NAT-T automatically, but on Linux (Ubuntu), you may need to explicitly configure it.

Try adding the following options to your IPsec configuration (/etc/ipsec.conf).

nat_traversal=yes
forceencaps=yes

Then, restart the IPsec and XL2TPD services.

sudo systemctl restart ipsec xl2tpd

Additionally, make sure the required UDP ports (UDP 500 and 4500) are open on your firewall.

Let me know if you need further assistance!

By: K.

K. — Tue, 11 Feb 2025 21:22:57 +0000

What if the VPN server is behind a NAT device? I can establish a connection from a Windows client, but not from a Linux client (Ubuntu).

By: Eugene

Eugene — Tue, 24 Jan 2023 08:02:54 +0000

Hello

Is there the same instruction but for a linux server without GUI?

By: Ravi Saive

Ravi Saive — Thu, 01 Dec 2022 05:37:47 +0000

In reply to Alexander. B. @Alexander, Read this guide - How to Set Static IP Address and Configure Network in Linux

By: Alexander. B

Alexander. B — Mon, 28 Nov 2022 19:04:25 +0000

How can I set a static IP in Linux?