Dammit! It looks like we’ll have to get into some custom firewall rules then. Okay, give me a day or two. In the meantime you’re going to need to install LuCI… & we should make a backup before making any unsupported changes to your firewall. See the below link.
I’m going to need a day or two to dig up some references from the OpenWrt Wiki. It’s been longer than I care to remember since I had to resort custom firewall rules.