E-Lins H750 Series User Manual page 65

 MTU: maximum transmission unit.
 Keep Alive: Number of unanswered echo requests before considering the peer dead.
The interval between echo requests is 5 seconds.
 Checkup Interval: Number of seconds to pass before checking if the interface is not
up since the last setup attempt and retry the connection otherwise. Set it to a value
sufficient for a successful L2TP connection for you. It's mainly for the case that netifd
sent the connect request yet xl2tpd failed to complete it without the notice of netifd.
 Debug: add L2TP verbose log into system log
 L2TP Server configuration
 Local IP: indicate server's IP address.
 Remote IP range begin: the remote IP address leases start
 Remote IP range end: the remote IP address lease end.
 Remote LAN IP: the remote LAN subnet can be accessed via L2TP tunnel, such as
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