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User Manual
GWR High Speed Cellular Router Series
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Figure 27– GRE tunnel parameters configuration page
GRE Keep alive
GRE tunnels can use periodic status messages, known as keepalives, to verify the integrity of the
tunnel from end to end. By default, GRE tunnel keepalives are disabled. Use the keepalive check box to
enable this feature. Keepalives do not have to be configured on both ends of the tunnel in order to work; a
tunnel is not aware of incoming keepalive packets. You should define the time interval (in seconds) between
transmitted keepalive packets. Enter a number from 1 to 60 seconds, and the number of times to retry after
failed keepalives before determining that the tunnel endpoint is down. Enter a number from 1 to 10 times.