User Guide

NETNode Operations Guide
Commercial in
Confidence
IP Mesh Systems
000-130
R1.8 2015-07-24
Commercial in
Confidence
Page 2-43
To isolate the IP layers each NETNode contains a second IP address (and MAC address)
which is used for the tunnelling. This IP address only supports ARP, ICMP (ping) and the
UDP tunnelling packets.
When this Interlink mode is activated, each node also sends out a broadcast packet on the
second IP interface which advertises it’s presence on the IP backbone. This allows each node
to know what other nodes are connected to the backbone, and thus whether the interlink
data can be sent across the IP network. The nodes also check that there is one and only one
master on the network and correct this if necessary. This is useful if, for example, the master
is lost from the network.
Figure 2-16 Interlink RF operation
Step 2: Configure the NETNode to operate with Interlink Mode
If there are multiple mesh networks on different frequencies anywhere on the same network
they must have different Mesh IDs before starting. This can be checked with Node finder.
To enable the interlink mode, select the interlink mode tab and provide an IP address for
each active port connected to the IP backbone. The IP address must be on the same subnet
as the NetNode. Both ports can be used (for redundancy) but in this case, both ports must
have different IP addresses and share the same NETNodes on the backbone. (That is, a unit
cannot act as a switched hub for the tunnelling data).