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limit port access to localhost

I've written a few WebSocket servers to run locally for custom personal apps. I have no authentication since they're meant to run locally, but I need to be sure that no other system on the network ...
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1answer
389 views

How do I set up user level restrictions on a gateway?

I am aware that Ubuntu Server can be used as a gateway to allow Internet connection to a LAN. Then we use IP tables or other firewall settings to restrict (for example), certain websites from being ...