How to temporarily prevent a connection with one or more IP in the same subnet

Let's say i have a server 192.168.0.1/24 and other 3 devices 192.168.0.2/24, 192.168.0.3/24 and 192.168.0.4/24, so all my devices/server are on the same subnet. From 1:00am to 2:00am i want temporarily prevent connection/ping from 192.168.0.1 to 192.168.0.2 and 192.168.0.3 but not with 192.168.0.4. Is there any way to do it for example with a scheduled script?

Thank you.
mathayus_ITAAsked:
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QlemoConnect With a Mentor Batchelor, Developer and EE Topic AdvisorCommented:
Depending on the OS on 192.168.0.1, you could use the Windows Firewall to block outgoing connections to those addresses, with the firewall active only on schedule. This works with Vista and up.

Or you could use a Personal Firewall application to do the same.

Or - and that is a cheap hack - create host routes for those addresses with a gateway which will not forward the requests (should be any device other than 192.168.0.1).
E.g. a
    route add 192.168.0.2  192.168.0.254
where .254 is non-existent, is preventing any access to 192.168.0.2. However, traffic is produced.
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