There seems to be an upgrade path from 2.1.x to 2.2.x? I first tried 2.2.6 and it failed. So now I am running 2.2.3 Build 20231201 Rel.32918. I did a Wireshark on my PC for the VPN negotiation...

@MR.S No. I have not. Is there a version that you could recommend? I found on this page several versions: https://www.tp-link.com/us/support/download/er605/v2/#Firmware ER605(UN)_V2_2.2.6 Build...

@RaRu Thanks again. I understand what a public IP address is. As I have set up SSH into the office, I know the office has a public IP. Here is the screenshot of the L2TP setup: I am not sure what...

Not sure why, every time I paste the screenshot image in a reply, the image disappears. There is not much to it. Just a simple L2TP server set up. There are 4 items in the L2TP Server Setting page:...

@RaRu Thank you for that reminder: 55.66.77.88 is not my real IP address. I do get public IP address from the ISP -- not sure what this question is about. By "your router" I assume you mean the...

I followed a post here (ER605: How to setup a Client to LAN IPSEC VPN to connect to via Windows 10 for example?) and this TP-Link FAQ article (How to establish an L2TP Server by Omada Gateway in...