This page provides an overview of the network policy components in Fuchsia.
Current components
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.
Future components
Multi-networking support
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.
Testing
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.