Like in Bridging Wireless Routers? You can spot the main router because it is connected to a modem, if this router is being connected by its port then this is the main router.
Thanks for the reply!!
but if i didn't connect the modem then there will be no internet connection?
again i want to know if there are 2 router then modem is connected to the first router n second router is connected to the port with the system and both router are connected to each other(wired).then there will be a internet connection establish or not n which will be the gateway router (gateway ip)for the system.