Digi TransPort WR11 User Manual page 377

Configuring network interfaces
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. The router uses function primarily when IP traffic is being
carried over a W-WAN link and when the associated PPP instance is configured into the always-
on mode.
Use ETH 0 IP address as the source IP address
When enabled, causes the router to use the IP address of interface ETH 0 as the source
address for ICMP echo requests instead of the current IP address of the PPP interface.
Defer sending pings if IP traffic is being received
One of the uses for sending ICMP echo requests is as a keepalive mechanism. When this
setting is enabled, the router defers sending the ping packets out if IP traffic is being received,
since in this case, separate keepalives are not needed.
Limit the data transmitted over this interface
Some service providers impose a (usually monthly) limit on the amount of data sent over a link
and levy additional charges if the limit is exceeded. This is fairly common practice for W-WAN
links. When enabled, this setting causes the router to stop sending data on the interface when
the preset data limit has been exceeded. The interface is unlocked manually by clicking the
Clear Total Data Transferred button on the Management > Network Status > Interfaces >
Advanced > PPP > PPP n page. Alternatively, it can be reset automatically on a certain day of
the month.
Issue a warning event after n Kbytes/Mbytes/GBytes
The value in this text box is the amount of traffic which will cause a warning event to be
generated in the event log stating that the specified amount of data has been transferred. The
units are specified by a drop-down list, having the following options; KBytes, MBytes, GBytes.
For example, if the monthly tariff includes up to 5 MB of data before excess usage charges are
levied, it would be useful to set this threshold to 4 MB. This would cause the router to create a
warning entry in the event log once 4 MB of data had been transferred. You could use this
event to trigger an email alert, SNMP trap or SMS alert message.
Digi TransPort® Routers User Guide
Configure PPP and external modems
377