Digi TransPort WR31 User Manual page 311

Configure network interfaces
Forward IP broadcasts over this interface if the interface is on the same IP network as an
Ethernet interface
When enabled, causes the router to route broadcast packets to and from Ethernet interfaces.
This will only occur if the PPP instance has issued an address which is part of the Ethernet
interface network.
Send LCP echo request packet to the remote peer
When enabled, displays the configuration parameters that cause the router to send Link Control
Protocol (LCP) packets to the remote peer at specified intervals. This feature can be useful for
keeping a link active (W-WAN, for example).
Send LCP echo requests every s seconds
The value in this text box sets the interval at which to send the packets. When set to 0,
transmission of LCP packets is disabled.
Disconnect the link after n failed echo requests
The number of consecutive failed echo requests allowed before the router terminates the link.
When set to 0, this functionality is disabled, such as the router will not terminate the link if the
LCP echo requests do not elicit a response from the remote.
Generate Heartbeats on this interface
When enabled, displays the configuration options controlling how the router sends heartbeat
packets. Generating a valid configuration enables the router to send heartbeat packets to the
specified destination. Heartbeat packets are UDP packets containing information about the
router and which may include status information for locating its current dynamic IP address.
Heartbeats can also contain GPS position information and mobile telephone module
information.
Send Heartbeat messages to IP address a.b.c.d every h hrs, m minutes, s secs
The left-hand text box contains the IP address of the destination for the heartbeat packets. The
remaining text boxes specify the desired interval between sending heartbeat packets.
Use interface x,y for the source IP address
Select of the source interface for the UDP heartbeats. Selecting an Ethernet source allows the
packets to follow the routing table instead of being sent out from the PPP interface on which
they are set.
Digi TransPort WR Routers User Guide
Configure Advanced interfaces settings: External modems and PPP
311