screenmode - Enable or disable gateway screening
The screenmode command enables or disables gateway screening if the argument is on or off, respectively. See the screen(2) reference page for more information on gateway screening.
When no argument is supplied, screenmode indicates the state of gateway screening as on or off.
In order to avoid packets being forwarded before the screend program has been started, screenmode should be run before configuring any interfaces, other than the first interface on the system (which might be needed during the bootstrap sequence).
Only the superuser can change the state.
If gateway screening is disabled while screend is running, the daemon might exit.
If an unauthorized user tries to change the state, an error message is displayed.
Commands: screend(8), screenstat(8) delim off