User Guide

NETNode Operations Guide
Commercial in
Confidence
IP Mesh Systems
000-130
R1.8 2015-07-24
Commercial in
Confidence
Page 2-26
Figure 2-9 GPS NETNode located on a map
Note: You must have a map loaded on the GPS and have loaded the coordinates of the
corners of the map. Only then will the GPS show the location of the NETNode.
You can find out how to upload maps and set coordinates in the Advanced Setup
chapter.
2.5 About NETNode IP Functionally
Each NETNode behaves as a Switched Hub. This hub contains two real ports (‘eth0’ and
‘eth1’), a virtual port to each remote NETNode across the radio interface (‘msh0’ – ‘msh15’
(where number=node)), and a local virtual port (‘loc’) for control and local streaming. The
HUB contains additional packet filtering to prevent unnecessary packets from being passed
across the network.
The packet filtering rules are as follows:
 Only packets of type ARP and IP are passed all other packet types are blocked
 Scanning Tree Protocol is forwarded (and a metric added if passed across the radio) if
enabled
 The maximum MTU is 1514 or 1518 for VLAN single tagged packets
 VLAN packets are supported if enabled on a tag by tag basis
 Only packets from the local subnet are passed by default
 Packets for other subnets are allowed if Static Routes are manually entered or Routing
Information Protocol is enabled and received
 Broadcast packets on IP address 255.255.255.255 or within the same subnet are passed
to all ports
 Multicast packets 224.0.0.1 – 224.0.0.255 are passed to all ports