@Rfcomm It sounds like you're suffering from a common networking issue known as 'Double NAT'. That's when your ISP provided device is broadcasting and then you connect your own device (the AC1200) which also broadcasts. It can work but if not setup correctly, can cause the exact issues you're describing. In more technical terms, the printer is on Subnet A and the AC1200 in the remote building is on Subnet B. While Subnet B can "see" the internet (by passing through A), devices on B cannot easily "see" or discover local devices (like printers) on A because the remote router's firewall is blocking that internal traffic.
I believe the solution for you would be switching the AC1200 into Access Point Mode. Doing so disables the "routing" features (DHCP and NAT) on the AC1200 and turns it into a pass-through device. This allows the ISP router to handle all IP addresses and places the remote devices on the same network (subnet) as the printer. This should fix the printing issue.
Your steps would be:
- Ensure the Cat6 cable runs from a LAN port on the ISP router to the WAN (internet) port on the AC1200
- Log into your AC1200
-
Advanced > Operation Mode (or System > Operation Mode).
-
Select Access Point
-
Reboot router
"Mesh" generally implies a wireless link between routers but since you went through the trouble of installing a Cat6 cable, you are using "ethernet backhaul." While some systems call this wired mesh, in the context of a generic ISP router and a TP-Link router, Access Point Mode would be the correct correct method to bridge the two buildings using that wire.
