SND: LCP Echo_Request id(14) len(8) [Magic_Number 5c33c6bb]CLI Syntax.
l2tp_ppp_send()-395: tunnel=52
No response to 3 echo-requests <----- Missed LCP echo messages before disconnection.
Serial link appears to be disconnected.
ipcp: down ppp:0x7f7940007000 caller:0x1872e100 tun:-1
SND: LCP Termiate_Request id(6) len(23)
l2tp_ppp_send()-395: tunnel=52
SND: LCP Termiate_Request id(7) len(23)
l2tp_ppp_send()-395: tunnel=52
Connection terminated.
# config vpn l2tp
set lcp-echo-interval “integer” >> Enter an integer value from <0> to <32767> (default = <5>).
set lcp-max-echo-fails “integer” >> Enter an integer value from <0> to <32767> (default = <3>).
end