Thanks for your concern. The reason I am specifying this topic is the fact that some PLC management softwares use Layer 2 protocols. In this case Layer3 VPNs do not work for the connectivity. In this case layer 2 VPN HUB is required. Teltonika devices support TAP mode and if VPN HUB also supported this, this would be great for Teltonika, especially for all kind of otomation networks. It will increase number of our teltonika projects.