Resolved Routers not finding home network

Hi, Just an advanced warning, I am not very educated on Network configuration so please be patient.

I had four PCs on a home network hard wired to a (A) Wireless Router/Modem with four Lan ports which worked fine for two years. I needed to expand my Network so I purchased a (B) four port Router with a Wan port. This Router (B) was connected to a Lan port on Router (A) Wan to LAN. I changed the IP address on Router (B) as both were the same by default. I can connect to the Internet on Router (B) via Wan to Lan on Router (A). The computers on each router can see only the ones Networked on A or B, (as if two separate networks) not as a complete Network. (A) cannot see PCs on (B) nor vis versa. Can someone explain in simple terms what I need to do please.

NEILMAC...........

OS. XP SP3

 

Hi, Thanks for that TonyT. The default IP on the routers was 192.168.1.1 so I changed router (B) IP to 192.168.2.1 and disabled DHCP but I still cannot see any of the PCs on router (A). If I change the IP in WAN setting i cannot get onto Internet from router (B)

Now it may be am not understanding your instructions above.

NEILMAC.............

 

Hi, Ok ignore my last comms, the mistake I was doing after changing the IP was that I connected the routers WAN to LAN instead of LAN to LAN. All working fine now. Second router works as a switch.
Thanks for all the help

NEILMAC..............