How to Prioritize Logon Server Selection

Here's the Situation

I have 4 Domain Controllers in my Domain, at 2 different sites, on two different subnets,

dc1 192.168.1.100/24

dc2 192.168.1.101/24

dc3 192.168.2.100/24

dc3 192.168.2.101/24

how do I set it up that computers on my 192.168.1.0 Network Don't use the domain controllers on the 192.168.2.0 Network?