And what about LTE gateways like Er706W-4G, can LTE connection be used for SD-WAN or not?

Can any Omada gateway use USB modem / own 4G to connect via SD-WAN to another gateway on same controller? It seems it is not possible.

Has anyone tried newest firmware for EAP245 v.3 - 5.3.3? I'm on 5.2.0 and I don't see it available in Omada but it is available on web. I don't have any issues with 5.2.0 mentioned here on forum so...

Just want to bring this up. Does anyone have solution for this?

@Vincent-TP I might not said it clearly in OP. I can access other SD-WAN sites from my main LAN network without any problem. The problem is I have only one WAN with public IP and I would like to open...

@MR.S I know I can use OpenVPN, I was just courious if this kind of NAT usage is possible or not.