This is useful if...
- Your USG sits behind another firewall (such as in an apartment complex or dorm)
- Your USG receives a private IP instead of a public one
- You are unable to put the other router in bridge mode or passthrough mode
- The other router forwards all ports for the public IP to your USG
- Enable Dynamic DNS for your domain in Namecheap
- Create an A+Dynamic DNS record for the desired hostname