About UDP echo
Digi TransPort User Guide 480
About UDP echo
When enabled, the UDP echo client generates UDP packets that contain the router’s serial
number and ID and transmits them to the IP address specified by the configuration. When the
remote router receives a UDP packet on a local port and UDP echo server is configured, it will
echo the packet back to the sender. There may be more than one UDP echo instance available on
the router. Instance 0 is used when specifying the local port to listen on.
UDP Echo n parameters
Depending on the router model, there may be instances of the UDP echo task supported by the
router. Each has its own configuration web page, described below. For the command line
configuration, valid instance numbers start at 0.
Enable UDP Echo
This checkbox is disabled by default. When enabled, the configuration parameters associated
with send UDP echo packets are displayed.
Send a UDP packet to IP address a.b.c.d port n every s seconds
The values in these three text boxes define the destination IP address for the UDP packets, the
port number to which they should be sent and the sending interval. If the destination IP
address is left blank, the router will not attempt to send any packets.
Use local port n
The local port the router should listen on for UDP packets. If any UDP packets are sent to this
port, the router will send a copy back to the IP address and port they were sent from.
Route via Routing table / Interface x,y
These two radio buttons select whether the router should use its routing table to determine
how to send the UDP packets or whether it should use the specified interface. If the specific
interface is selected, the interface is selected from the drop-down list. The options available
are PPP and Ethernet. The interface instance is specified in the adjacent text box.
Only send packet when the interface is “In Service”
When checked, and the router is using the specified interface, this checkbox will prevent the
router from sending UDP packets if the interface is out of service.
Do not send any data with the UDP packet
When checked, this check box causes the router to send only a single null data byte. This is
useful to minimize packet size when the interface has high data charges, such as W-WAN.
When unchecked, the router sends packets containing the router’s serial number and ID as
text.
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