Multiples gateways !!

Hi,

My network…

MK SXTqs 5 ac → 12.12.12.1 → DHCP → GW the same IP – DNS Servers → 8.8.8.8 8.8.4.4
NanoStation M5 → 12.12.12.2
NanoStation M5 → 12.12.12.3

I need to redirect the traffic from 12.12.12.50 - 12.12.12.100 to 12.12.12.2

I need to redirect the traffic from 12.12.12.150 - 12.12.12.200 to 12.12.12.3

Thanks any suggestion..

Best regards