Try this:
- Go to https://portforward.com/ and find your router. If they don't have it you'll have to Google for the user manual.
- Assign your PC and/or consoles static IP addresses.
- Forward the Wildlands ports to your PC and/or the Sony Network/Xbox Live ports to your consoles.
You can read about NAT types here: https://portforward.com/nat-types/
You can read about Wildlands specifically here: https://portforward.com/ghost-recon-wildlands/