How to block / allow local internet access using proxy server (Local Machine)

 To block or allow local internet access using a proxy server on a local machine, you can follow these steps:

1. Install a proxy server software on your local machine. There are many free and paid options available, such as Squid, CCProxy, and WinGate.
2. Configure the proxy server to allow or block local internet access. This process varies depending on the proxy server software you choose, but most proxy servers have options to specify rules for network traffic. You may need to consult the documentation for your chosen proxy server software to learn how to configure these rules.
3. For blocking local internet access, you can create a rule that denies all network traffic originating from the local machine. This will prevent any internet activity from occurring on that machine.
4. For allowing local internet access, you can create a rule that allows network traffic originating from the local machine. This will enable internet access on that machine.
5. Test your configuration to ensure that it works as expected. You can do this by attempting to access the internet from the local machine and verifying that the proxy server is either blocking or allowing access as desired.

Note that blocking local internet access can have unintended consequences, such as preventing the local machine from communicating with other devices on the same network. You should carefully consider the implications of blocking local internet access before implementing this configuration.