Preventing internal network traffic with linux firewall
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If you put them to different LAN, you can apply filer rule in iptables, otherwise they WILL communicate through switch, because they will use same LAN IP and their packets never reach LAN GW.
As said, you can filter using IPtables on the PCs whether or not they are on the same subnet. If you have an un-managed switch behind your Linux firewall/router, which the PCs connect to, you won't be able to filter using the firewall. Most managed switches will let you filter.
If the Linux firewall has multiple LAN-side ethernet ports acting as a LAN switch using brctl, you can use ethtables to filter between switchports.
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