So in the guide it says you cannot have multiple NICs on the Linux install. I learned this the hard way because the web server throws a 502 Bad Gateway error when you try to access it. I am using OpenVPN with all of my customers. I tried the SBC and just plain old STUN with so many issues. OpenVPN has been amazing. However, I want to run OpenVPN on the same server as the 3CX services. OpenVPN creates a TUN interface with an IP for the remote clients. I am doing this on Windows currently with the v14 multi-tenant 3CX and it works just fine. Since 3CX is abandoning the multi-tenant model, I am forced to use multiple servers with Amazon which cost a lot more than what I was paying for just the 1 server. It seems like in order to get this to work, I will need a single machine just for OpenVPN and one for each tenant. I am looking at using OVH for their small VPS servers. Problem is, those servers do not offer a private IP space to put all of these machines together. So I need OpenVPN to run on the same host as 3CX. So my real question is, what can be changed in the 3CX config to allow it to use a server with multiple NICs?