When forwarding a port, you have three options: the port number to forward, the connection type, either TCP (default) or UDP , and if you want to label the port. When you set up ports to be forwarded, they’ll show up here. This will open up the Port forwarding screen. There should be an option Port forwarding. Start by going to the developer settings on Chrome OS and clicking the Linux box. You can start using this with Chrome OS version 84 by enabling the Crostini Port Forwarding flag ( chrome://flags/#crostini-port-forwarding).
Warning: Launching in Chrome OS version 85, built-in controls for managing port forwarding are a new feature still under development, so the UI may change and the feature may break until it is stable. Chrome OS’s built-in port forwarding allows you to open the port to your local development server, allowing access from phones or other computers. When developing web apps, testing across multiple devices is vital to ensure that what you’re building will work for you users.
