How to change the IP address for CS 1.6 server?

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In CS 1.6, servers can be opened using HLDS. However, the IP address of that server works through the IP address of the person who opened it. So when I open a CS 1.6 server, my friends connect through my home's IP address. I want to change it or open it using a different IP subnet so that they don't know my home's IP address. Sharing my home's IP address doesn't seem logical to me. How can I do this?