Digi transport User Manual page 306

Configure Advanced interfaces settings
Include GPS information in the Heartbeat message
When enabled, causes the router to include the GPS co-ordinates in the heartbeat packet.
Generate Ping packets on this interface
When enabled, this checkbox causes the router to reveal the configuration parameters that
enable the sending of ICMP echo request (ping) packets. This feature can be used as part of a
backup interface strategy.
Send n byte pings to IP host a.b.c.d every h hrs, m mins, s secs
Controls how the ICMP echo requests are generated. The value in the left-hand text box
specifies the number of data bytes in the echo request. Typical values are 32 or 64 octets. The
IP host text box specifies the IP address of the host to which the ping packets are sent. The
remaining parameters specify how often the ping should be sent.
Send pings every h hrs, m mins, s seconds if ping responses are not being received
These three text boxes specify the interval at which to send pings when more than one ping
request is outstanding. When left at the default of zero this function is disabled.
Switch to sending pings to IP host a.b.c.d after n failures
These parameters allow for more reliable problem detection before failover occurs. If the
value in the first text box is a valid IP address, and the value in the second text box is greater
than zero, when a ping failure is detected on the primary host address, this secondary host is
tried. This is to ensure that should the primary host become unavailable for any reason and
stops responding to the ICMP echo requests, the router will check an alternative IP address
before initiating the failover procedure. The value in the second text box is the number of
pings that should be allowed to fail before checking the secondary IP address.
Ping responses are expected within s seconds
When the value in this text box is set to a non-zero value, the router will wait for that specified
interval for a response from a ping request before applying the timeout specified in the Send
pings every ... if ping responses are not being received setting above. If the value is set to
0 (the default) then the router applies the timeout without modification.
Only send Pings when this interface is "In Service"
When enabled, causes the router to only send ICMP requests when the PPP instance is in
service. The default setting is unchecked which means that ICMP requests are sent when the
interface is in service and out of service.
New connections to resume with previous Ping interval
When enabled, causes the router to use the ping interval that was in force when the PPP
interface last disconnected.
Reset the link if no response is received within s seconds
The period for which the router should wait before terminating the PPP connection if no
response to the auto-pings has been received. This behavior is useful in the attempt to re-
establish communications, since the router will automatically attempt to restart an always-on
link that has been terminated. This function is primarily used where IP traffic is being carried
over a W-WAN link and where the associated PPP instance has been configured into the
always-on mode.
Digi TransPort User Guide 306