@Mar-Komus I still don't know what WAN IP binding is, but I did find this. How to set up a Dynamic DNS service account... Again, it doesn't explain what it is, but whatever. I checked the box like it...

I'm setting up DDNS with my NO-IP account. One thing I don't remember coming across when I had DDNS set up in DD-WRT on a different router was this "WAN IP binding." What is WAN IP binding? What is...