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Allow connection to internet but block local connections

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PC A resides on a network with an ISP provided main router & additionally 2 WiFi Access Points, serving several devices beside PC A.

I'm looking to set-up an internet accessible SSH service on a PC A. Whilst SSH is great, I would like to mitigate the risk that PC A is compromised (e.g. accidentally exposed password), and introducing a virus or otherwise gaining access to the other devices.

Is there a way to allow PC A to communicate on the internet, but not see (or even know) about the other devices on the intranet? I can put the computer on another subnet, but it can easily change its IP address so it can see other subnets (I think?).

One way would be take out another ISP package (or 4G box) altogether so it is guaranteed to be separate, but its not cheap and seems unnecessary. Is the next step beyond this a more complex firewall system, or is there something in-between?

Any ideas to an alternative schemes welcome!

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