[strongSwan] IPSec route based VPN - VTI interface TX Errors NoRoute

Tiago Stoco tmsblink at msn.com
Sat Sep 11 15:13:04 CEST 2021

Hi Noel,

Quick update to the thread.

I know that pfSense is not related with this mailing list, but as a proof of concept for the issues described here the pfSense LAB site-to-site was set up and it worked flawlessly 👉 https://blog.infoitech.co.uk/pfsense-ipsec-vpn-routed-vti-site-to-site/

I have switched one of the pfSense boxes used in the example above to stablish the tunnel with my Linux box and still the same issues as before.

I am writing a script to capture packets throughout all my iptables chains and I will then analyze the captures to see if I can spot something.

Best Regards,


From: Users <users-bounces at lists.strongswan.org> on behalf of Tiago Stoco <tmsblink at msn.com>
Sent: Friday, September 10, 2021 7:31 AM
To: Noel Kuntze <noel.kuntze at thermi.consulting>; Noel Kuntze <noel.kuntze+strongswan-users-ml at thermi.consulting>; Tobias Brunner <tobias at strongswan.org>; users at lists.strongswan.org <users at lists.strongswan.org>
Subject: Re: [strongSwan] IPSec route based VPN - VTI interface TX Errors NoRoute

Hi Noel,

I did not give up on this yet. The last couple of days were quite busy at work and home.

However, I have managed to draw a diagram on how I believe the site-to-site VPN would work 👇


It is quite obvious how the traffic should flow through the VPN tunnel to allow the subnets to talk to each other.

I have managed to spin up a new VM running pfSence to test a pfSense to Pfsense setup and then I will spin another VM to replicate the example you have shared.

Finally, I will be able to verify if my idea will work and be able to identify where is the anomaly in my current setup.

Wish me luck,

Best Regards.


From: Noel Kuntze
Sent: Friday, September 3, 2021 6:22 PM
To: Tiago Stoco; Noel Kuntze; Tobias Brunner; users at lists.strongswan.org
Subject: Re: [strongSwan] IPSec route based VPN - VTI interface TX Errors NoRoute

Hello Tiago,

It's more meant as a practical example on how to configure this and to look for anomalies in your setup.

Kind regards

Am 03.09.21 um 22:54 schrieb Tiago Stoco:
> Hi Noel,
> I will replicate the example below in my lab in the hopes to better understand the concepts behind an IPSec VPN tunnel.
> Tiago Stoco.
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