I am using 3 routers and from the first router (A) first port connected to the second router (B). From the first router(A) second port connected to the thrid router (C). PC's are connected from the ports of router A,router B, router C. My internet service provider is SBC. If i login to there router configuration the computers connected to the main router (A) is only shown in the network. The other computers connected via router (B) and router (C) is shown inactive. How can i connect all computers into one network???????