4 routers working together as one.

[Bob_of_DOOM]

Hello. I have QTY=4 of R6400 routers. I want to make them function together as one network. I have one router connected to my modem and would like to use the remaining 3 routers to extend this wifi network (i'll have them all connected with Cat5e cable). What would be the ideal way to configure the routers?

[microchip8]

4 routers is router mode creates a Double NAT problem (or Quad NAT). Use one router as main router and put the rest in Access Point mode