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7
Tunneling Protocols
Packet Window Size
Enter the maximum number of received but unacknowledged PPTP packets that the system can buffer.
The system must queue unacknowledged PPTP packets until it can process them. Minimum is 0 ,
maximum is 32 , default is 16 packets.
Limit Transmit to Window
Check the box to limit the number of transmitted PPTP packets to the client's packet window size.
Ignoring the window improves performance, provided that the client can ignore the window violation.
The box is not checked by default.
Max. Tunnels
Enter the maximum allowed number of simultaneously active PPTP 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 PPTP tunnel. Minimum is 0 , maximum depends on
the VPN Concentrator model; e.g., Model 3060 = 5000 . Enter 0 for unlimited sessions (the default).
Packet Processing Delay
Enter the packet processing delay for PPTP flow control. This parameter is sent to the client in a PPTP
control packet. Entries are in units of 100 milliseconds (0.1 second). Maximum is 65535 ; default is 1
(0.1 second).
Acknowledgement Delay
Enter the number of milliseconds that the VPN Concentrator will wait to send an acknowledgement to
the client when there is no data packet on which to piggyback an acknowledgement. Enter 0 to send an
immediate acknowledgement. Minimum delay is 50 , maximum is 5000 , default is 500 milliseconds.
Acknowledgement Timeout
Enter the number of seconds to wait before determining that an acknowledgement has been lost; i.e.,
before resuming transmission to the client even though the transmit window is closed. Minimum is 1 ,
maximum is 10 , default is 3 seconds.
7-4
VPN 3000 Concentrator Series User Guide
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