ACCM:
Option to enable/disable the use of Asyncmap (Asynchronous
Control Character Map) setting.
MRU
: Maximum Receive Unit. Use 1450 as default.
MTU
: Maximum Transmission Unit. Use 1450 as default.
Link Detection Interval(s)
: the interval in seconds between link checks.
Link Detection Retries:
the number of retries if PPTP link detection is
failed. If all retires are exhausted, the device will restart the VPN tunnel.
PFC:
Protocol Field Compression. Disabled by default.
IPSec:
the encryption protocol used by the L2TP VPN server. If selected,
an IPSec tunnel matching the server settings must be configured and
selected here. By default, no IPSec is in use.