to be specific ang pc 1 -15 has this configuration ----> ip address 192.168.1.11-26
subnet mask: 255.255.255.0
default gateway: 192.168.1.1
pc 16-50 -----> ip address 192.168.1.30-50 or whatever you like basta walay same ip address
subnet mask: 255.255.255.0
default gateway: 192.168.1.2
the gateways will tell you where the pc got his internet connection. if 192.168.1.1 --> router 1 (modem/router pldtmydslbiz pldt 3.5mbps) .. if 192.168.1.2 ---> router 2 (buffalo router) xyzel pldt w/ 6.5mbps...