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7
Tunneling Protocols
Enabled
Check the box to enable L2TP system-wide functions on the VPN Concentrator, or clear it to disable.
The box is checked by default.
Caution:
Disabling L2TP terminates any active L2TP sessions.
Maximum Tunnel Idle Time
Enter the time in seconds to wait before disconnecting an established L2TP tunnel with no active
sessions. An open tunnel consumes system resources. Enter 0 to disconnect the tunnel immediately after
the last session terminates (no idle time). Maximum is 86400 seconds (24 hours). The default is 60
seconds.
Control Window Size
Enter the maximum number of unacknowledged L2TP control channel packets that the system can
receive and buffer. Minimum is 1 , maximum is 16 , and default is 4 packets.
Control Retransmit Interval
Enter the time in seconds to wait before retransmitting an unacknowledged L2TP tunnel control message
to the remote client. Minimum is 1 (the default), and maximum is 10 seconds.
Control Retransmit Limit
Enter the number of times to retransmit L2TP tunnel control packets before assuming that the remote
client is no longer responding. Minimum is 1 , maximum is 32 , and default is 4 times.
Max. Tunnels
Enter the maximum allowed number of simultaneously active L2TP tunnels. Minimum is 0 , maximum
depends on the VPN Concentrator model; e.g., Model 3060 = 5000 . Enter 0 for unlimited tunnels (the
default).
Max. Sessions/Tunnel
Enter the maximum number of sessions allowed per L2TP tunnel. Minimum is 0 , maximum depends on
the VPN Concentrator model; e.g., Model 3060 = 5000 . Enter 0 for unlimited sessions (the default).
7-6
VPN 3000 Concentrator Series User Guide
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