Just becase you can get to the internet from the second router doesnt mean it is totally correct. Computers connected to the second router need to be able to communicate with with computers on the first. computers on the first router need to be able to communicate with devices on the second. If he is running DHCP on the second router with IPs starting at .100 (true fist IP will be .151) devices connected to the first router do not know how to route to an internal IP that is not assigned in the first routes DHCP pool. 192.168.1.xxx's are internal IP's.
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