ppp-watch(8) -- Linux man page
ppp-watch - daemon to make PPP interfaces act more like other interfaces
manages one PPP connection, including starting, stopping, and redialing.
It makes starting and stopping the connection synchronous activities.
is not really meant to be called directly. It should only be used from
within the ifup-ppp script.
The name of the PPP interface to bring up.
ppp-watch is being called at boot time and should time out after a
while if the PPP connection does not come up in order not to hang
the boot sequence.