I know how to setup DNAT rules for external traffic getting forwarded to internal hosts. Here is what I'm looking to do. I have a DNAT rule in my firewall forwarding traffic from port 9090 to an internal servers Remote Desktop port. This works great for connecting to RDP while not connected to a VPN. The clients are using servers.domain.com:9090 to connect to the server. I would like to get an internal rule setup so when they come into the office they can still connect to servers.domain.com:9090. I'm guessing I'll need to point servers.domain.com to the internal Ip address of the firewall. I tried a few different DNAT and Full NAT configurations and was unable to get this to work correctly. Can anyone help? Also here is the configuration of the DNAT.
Traffic Source: Any
Traffic Service: 9090
Traffic Destination: External Address
NAT Mode: DNAT
Destination: Internal Server Ip
Destination Service: 3389
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