Configure Advanced interfaces settings
Digi TransPort User Guide 307
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
checkbox 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 checked, this checkbox 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 may 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 5MB of data before excess usage charges are
levied, it would be useful to set this threshold to 4MB. This would cause the router to create a
warning entry in the event log once 4MB of data had been transferred. This event could then
be used to trigger an email alert, SNMP trap or SMS alert message.
Stop data from being transmitted after n Kbytes/Mbytes/GBytes
The value in this text box specifies the total amount of data that may be transmitted by this
PPP instance before the link is blocked for further traffic, and the value in the drop-down list
specifies the units which are; KBytes, MBytes, GBytes.
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