This image shows attempting to use the Interface ip address of eth4 as the next hop. This is NOT valid,
https://www.screencast.com/t/ElJXug4duhbS.
The gateway for this service will generally be the first or last address of the assigned subnet as indicated in your Service Activation Notice for the ISP. That will be the next-hop address to use in the policy. We want to send the packets to the ISP router to which eth4 is connected.