Hi, I have this scenario:
Internet <-> TRB140 LAN port <NAT> UniFi Security Gateway WAN port (USG) <-> LAN
USG works also as VPN server (L2TP with shared key)
So I need set on TRB140 DMZ for USG. I learned this is not possible, but TRB140 allows to make PortForward. So I tried to port forwarding all external port to all internal ports (in rule 0-65000) to USG. But VPN does not work, as well as scanning ports from internet shows all ports closed.
Just to check configuration of USG I tried another gateway instead of TRB140 and it worked. But I prefer to use TRB140.
So please let me know any advise, how to solve this scenario...