- Login to the ER GUI
- Go to Firewall/NAT --> NAT
- Click Add Destination NAT Rule
- Enter a description (e.g. "WAN1_OpenVPN")
- Choose your matching (e.g. Inbound Interface = WANx, Protocol = UDP, Dest Port = 1194)
- Set Translation Address/Port as desired
Repeat for each WAN interface and port. You can copy rules and simply modify them.
