[JGuru]

@Desi_Tek, LCP means Link Control Protocol. Reason :

lcp-echo-failure n
If this option is given, 'pppd' will presume the peer to be dead if n LCP echo-requests are sent without
receiving a valid LCP echo-reply. If this happens, 'pppd' will terminate the connection. Use of this
option requires a non-zero value for the lcp-echo- interval parameter. This option can be used to
enable pppd to terminate after the physical connection has been broken (e.g., the modem has hung up)
in situations where no hardware modem control lines are available.