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Hi Noel/Tobias/Everyone,</div>
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First of all, Thanks for your help !!!<br>
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Unfortunately, after more than a month submerged into my lab and countless forums and google articles researching about iptables, linux routing tables, strongswan ... I will give up and I decided to build a pfSense box and use the OpenWRT routers as layer2
switches.</div>
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I have analyzed the iptables captures and they do not reveal much. <br>
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The capture on the VTI interface shows the PING packet request and reply.</div>
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And on the iptables chains the PING reply is seen on</div>
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raw OUTPUT</div>
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mangle OUTPUT<br>
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filter OUTPUT<br>
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mangle POSTROUTING</div>
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and the PING reply with no response is seen on</div>
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raw PREROUTING</div>
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mangle PREROUTING<br>
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mangle INPUT<br>
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filter INPUT<br>
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The image below has a diagram flow for the iptables chains.<br>
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<a href="https://blog.infoitech.co.uk/content/images/2021/08/image-25.png" id="LPlnk">https://blog.infoitech.co.uk/content/images/2021/08/image-25.png</a><br>
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I am starting to believe that my problem could be a bug in the ipsec/strongswan implementation.</div>
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If someone else reading this thread find a solution, please update this thread cause it would be helpful to more people out there.</div>
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Best Regards,</div>
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Tiago Stoco.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Users <users-bounces@lists.strongswan.org> on behalf of Tiago Stoco <tmsblink@msn.com><br>
<b>Sent:</b> Saturday, September 11, 2021 10:13 AM<br>
<b>To:</b> Noel Kuntze <noel.kuntze@thermi.consulting>; Tobias Brunner <tobias@strongswan.org>; users@lists.strongswan.org <users@lists.strongswan.org><br>
<b>Subject:</b> Re: [strongSwan] IPSec route based VPN - VTI interface TX Errors NoRoute</font>
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Hi Noel,</div>
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Quick update to the thread. <br>
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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
<span id="x_👉">👉</span> <a href="https://blog.infoitech.co.uk/pfsense-ipsec-vpn-routed-vti-site-to-site/" id="LPlnk">
https://blog.infoitech.co.uk/pfsense-ipsec-vpn-routed-vti-site-to-site/</a><br>
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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.</div>
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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.</div>
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Best Regards,</div>
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Tiago.</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Users <users-bounces@lists.strongswan.org> on behalf of Tiago Stoco <tmsblink@msn.com><br>
<b>Sent:</b> Friday, September 10, 2021 7:31 AM<br>
<b>To:</b> Noel Kuntze <noel.kuntze@thermi.consulting>; Noel Kuntze <noel.kuntze+strongswan-users-ml@thermi.consulting>; Tobias Brunner <tobias@strongswan.org>; users@lists.strongswan.org <users@lists.strongswan.org><br>
<b>Subject:</b> Re: [strongSwan] IPSec route based VPN - VTI interface TX Errors NoRoute</font>
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Hi Noel,
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<div>I did not give up on this yet. The last couple of days were quite busy at work and home.</div>
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<div>However, I have managed to draw a diagram on how I believe the site-to-site VPN would work 👇</div>
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<div><a href="https://blog.infoitech.co.uk/content/images/2021/09/ipsec_diagram2.png">https://blog.infoitech.co.uk/content/images/2021/09/ipsec_diagram2.png</a><br>
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<div>It is quite obvious how the traffic should flow through the VPN tunnel to allow the subnets to talk to each other.</div>
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<div>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.</div>
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<div>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.</div>
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<div>Wish me luck,</div>
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<div>Best Regards.</div>
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Tiago<br>
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<b>From:</b> Noel Kuntze<br>
<b>Sent:</b> Friday, September 3, 2021 6:22 PM<br>
<b>To:</b> Tiago Stoco; Noel Kuntze; Tobias Brunner; users@lists.strongswan.org<br>
<b>Subject:</b> Re: [strongSwan] IPSec route based VPN - VTI interface TX Errors NoRoute
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<div class="x_x_PlainText">Hello Tiago,<br>
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It's more meant as a practical example on how to configure this and to look for anomalies in your setup.<br>
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Kind regards<br>
Noel<br>
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Am 03.09.21 um 22:54 schrieb Tiago Stoco:<br>
> Hi Noel,<br>
><br>
> I will replicate the example below in my lab in the hopes to better understand the concepts behind an IPSec VPN tunnel.<br>
><br>
> Tiago Stoco.<br>
><br>
> <br>
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