[Skunkworks] How do I connect two networks

hii skunkworks, hi all i am in need of advice. have *linkysys* router on lan network ip 192.168.80.0 subnet 255.255.255.240 gtw 192.168.123.254 connected to *level1* router on network 192.168.123.0 subnet 255.255.255.0 linksys picks internet from level1 need to access 192.168.80.0 computers from 192.168.123.0 network pliz help thank you regards chege