Digi TransPort User Manual page 266

Bring this tunnel up All the time/On demand
This parameter only applies to tunnels initiated from this router.
Bring this tunnel down if it is idle for h hrs, m mins, s secs
These radio buttons select whether or not the tunnel is permanently available or not. When
set to On demand, the tunnel will not activate automatically but will wait until it is triggered by
PPP. When set to On demand the values in the text boxes determine the timeout after which
the L2TP tunnel will closed down after the last L2TP call on that tunnel.
L2TP Window Size
The L2TP window size is selected from this drop down list. Available values are from 1 to 7.
Route UDP packets over interface x,y
These two text boxes specify the interface and its instance number that should be used for
L2TP UDP sockets. Specifying these parameters allow the router to raise the interface should it
be disconnected.
Source Port Normal/Variable
These radio buttons select the source port for the L2TP tunnel. When set to Normal the
default port number of 1701 is used. When set to Variable a random source port value will be
used.
Name
The value in this text box is the name that is used to identify the router during the negotiation
phase when establishing an L2TP tunnel.
Authentication Off/Secret
The radio buttons select whether or not to use authentication. This is normally set to Off as
most host systems require that IPsec be used over L2TP tunnels. If Authentication is set to On,
authentication is enabled and the Secret parameter becomes relevant. The value in the text
box contains a passphrase that is shared with the host and which will be used if the remote
host requests authentication and Authentication is set to Off here.
Related CLI commands
Entity
l2tp
l2tp
l2tp
l2tp
l2tp
l2tp
Digi TransPort User Guide
Instance Parameter
n listen
n swap_io
n remhost
n backremhost
n aot
n nocallto
Values Equivalent Web Parameter
OFF,ON Act as a listener only
OFF,ON Enable server mode
Valid IP address Initiate connections to a.b.c.d
a.b.c.d
Valid IP address Use a.b.c.d as a backup
a.b.c.d
OFF,ON Bring this tunnel up All the time/On
demand
0 - 4294967296 Bring this tunnel down if it is idle for
h hrs, m mins, s secs
IPsec parameters
266