Oh, great.
Just want to bring up this:
Many consumer routers do not allow you to do this with the vendor firmware. It is good you can do it on your current tp-link units.
If you need to replace these routers in the future, remember that a critical feature is the ability to turn off nat and firewall. That will be a must have control.
If openwrt can be used on a given device, this won’t present an issue, but be sure that you always have a way to access these controls either with the vendor firmware or with openwrt.
Meanwhile…
If your problem is solved, please consider marking this topic as [Solved]. See How to mark a topic as [Solved] for a short how-to.
Thanks! 