Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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If computers are in same network, even with different ip addresses, they still can see all broadcast and multicast traffic. This means for example dhcp.
If you fully trust your computers, and are sure that no external party can access any of them, you should be fine. But if anyone can gain access to any of your computers, it is trivial to gain access and sniff traffic in all networks.
If you need best security, multiple switches and multiple nics are unfortunately only really secure solution.
Broadcast traffic (such as DHCP) doesn't cross subnets without a router configured to forward it. It's one of the reasons subnets exist.
No, I do not trust my computers that much. Quite unfortunate, really that I'll have to build a whitebox switch to get what I want