3Com Switch 8800 Family IPsec Module Configuration and Command reference Guide

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Parameter
number: Tunnel interface number to be set, in the range from 0 to 1023.
Description
Use the interface tunnel command to create a tunnel interface and enter the
view of this tunnel interface.
Use the undo interface tunnel command to delete the specified tunnel
interface.
By default, there is no tunnel interface in the system.
The interface tunnel command is used to enter interface view of the specified
tunnel. If the tunnel interface does not exist, the system will create it before
entering tunnel interface view.
Tunnel interface numbers have only local significance. The two ends of a tunnel
can use the same or different interface numbers.
Related command: source, destination, gre key, gre checksum,
tunnel-protocol.
Example
# Create interface Tunnel 3.
[SecBlade_VPN] interface tunnel 3
keepalive Syntax
keepalive [ seconds [ times ] ]
undo keepalive
View
Tunnel interface view
Parameter
seconds: Internal for sending keepalive messages in seconds. It is in the range 1 to
32767 and defaults to 10.
times: The maximum number of keepalive message sending attempts. It is in the
range 1 to 255 and defaults to 3.
Description
Use the keepalive command to enable the keepalive function of GRE and
configure the interval for sending keepalive messages and the maximum number
of sending attempts as well.
Use the undo keepalive command to disable the keepalive function.
By default, the keepalive function of GRE is disabled.
After you configure the keepalive command, the SecBlade sends GRE keepalive
packets regularly. If no response is received for a keepalive packet that it has sent