Enable ntopng, a high-speed web-based traffic analysis and flow collection tool.
With the default configuration, ntopng monitors all network interfaces and displays its findings at http://localhost:${toString config.services.ntopng.http-port}. Default username and password is admin/admin.
See the ntopng(8) manual page and http://www.ntop.org/products/ntop/ for more info.
Note that enabling ntopng will also enable redis (key-value database server) for persistent data storage.