This page provides an overview of the network policy components in Fuchsia.
Reachability: A component for running network health checks to determine the service level of networks known to the host. It exposes the fuchsia.net.reachability API, which other components can use to subscribe to changes in network service levels.
Netcfg: A component for naming and installing discovered interfaces into the network stack. It can also perform provisioning, such as starting a DHCP client.
Http Client: A FIDL server for fuchsia.net.http.Loader, backed by fuchsia-hyper.
fuchsia_network_monitor_fs: A Unix-compatible filesystem in Starnix that receives properties of installed networks and communicates property updates to the socket proxy.
Socket Proxy: A component for tracking currently registered networks and assigning an appropriate mark to sockets that need one. Communicates with fuchsia_network_monitor_fs to be notified of networks registered with Starnix.
Netemul integration tests enable testing the components in hermetic test environments and with virtual networks. Fuchsia currently has netemul integration test suites for reachability and netcfg. Tests not relying on interactions with the netstack exist within the component-specific directories.
