This how to is for RF830 with dual internet WAN links 
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How to Create SNAT rules so a particular IP address or workstation go out on specific WAN link 
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- create name for the LAN workstation in Networks & Services --> Network Configuration.  i.e. private1 / 192.168.2.20 / 255.255.255.255

- create SNAT rule in Network Setup --> SNAT.  i.e  private1 - Any - Any - Wan1Interface (or Wan2Interface)
- Click on Save & restart and save option to save the settings.


How to Create SNAT rules so a particular TCP port go out on specific WAN link
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- create name for the TCP port or use standard port that is already defined.  In Networks & Services --> Service Configuration.  i.e. Port555 - TCP+UDP - 1:65535 - 555
- create SNAT rule in Network Setup --> SNAT.  i.e  LAN - Port555 - Any - Wan1Interface (or Wan2Interface)

- Click on Save & restart and save option to save the settings.

NOTE: when creating custom services, the source port of the service MUST be defined with 1:65535