office network connection

i just hooked up to a satellite with a netmodem.and was given two ip add.one for the netmodem and another one which i inserted into a computer system(216.147.-.7).the problem is that when i tried to add/connect any other computer to the netmodem anduse ip address 126.147.-.8 or 9 or 10 it won’t work i.e browse the net.but only the 216.-.-.7 will work.(i don’t have a router or switch now)i hope to get that soon