Connect 2 routers each with its own internet connection
Organization where I work has 2 networks i.e. 2 LANs, both are workgroups A & B. Each has its own router that connects to internet directly. 1 LAN cable of 1st router is plugged in switch with many RJ45 ports. I've configured 1st router's DHCP settings from 192.168.1.131 till 192.168.1.255 & the 2nd one from 192.168.1.2 to 192.168.1.129 Default gateway of routers is 192.168.1.1 & 192.168.1.130 respectively. Now problem is that I don't know that when computers are turned on which internet connection will be used by computers. The 1st router or the second one. Is there a way to restrict computers of workgroup A to get internet services from 1st router only & not the other one, if so how. This is important as internet traffic has to be divided network model will be workgroup only.
I'll be very thankful for the reply.