The translation by Brave plugin using Chines simplified to English
I give all credit to Rob the Admistrator
—>>Starts here<<–
Some users need to use the 2.5G mesh for intranet, so here is a WAN/LAN switching method
first step ，Enter LUCI
second step ，Set the WAN mouth as the LAN mouth and enter the network-> interface on the luci page，Edit WAN and change the equipment toeth1 ，Click on the preservation in the bullet window
The third step ，Set the LAN mouth to the WAN mouth, enter on the luci page Network-> interface-> equipment ，Edit br-lan，Removeeth 1 from br-lan and add eth0 to br-lan ，Click on the preservation in the bullet window.
fourth step ，Apply and reconnect to the net, click to save and apply （Note that the switch has already begun at this time, and the page will not respond ）, wait a little bit about 30S, reconnect the WAN/LAN grid line, and access the router management interface through the new LAN intersection
I operate the above operation based on MT3000, and other models are actually similar, you can modify them slightly according to the above steps