|Actually you can have two networks on the same subnet.|
It's just a bit of work is all.
I am going to assume these networks also have their own gateways [routers to the internet]
Routers can not be on the same ip. So router 1 has to be at 192.168.1.1 and router 2 has to be at 192.168.1.2 for example.
You have two methods:
#1 do static ip assignments to all pcs.
Network 1 has x.x.x.10-175
Network 2 has x.x.x.176-254
or any split you want to use.
You assign gateway 1 to network1
You assign gateway 2 to network 2
#2 is the same except you do ip reservations in each router which is where you associate the ip settings with the machines mac address so it gets the same ip settings everytime.
You have to do #1 or #2 or you will have network1 pcs getting network2 ips and visa versa
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