There is a known issue for Linux Real-Time RIO devices where UDP multicast static IP routes are not always included in the default configuration. Although the RIO might be receiving the packets, they are not being properly routed from the multicast address to the primary NIC (Network Interface Card) on the hardware. You can manually add the rule to the routing table by entering the following command into the terminal over an SSH connection:route add -net 18.104.22.168 netmask 240.0.0.0 dev eth0
This will add the static routes for all packets arriving from the possible UDP multicast address range (22.214.171.124 through 126.96.36.199). To make the changes persist after rebooting the device, you can either write a script to run this command on device initialization or manually add the rule below to the network interface configuration files in /etc/ifplugd/ifplugd.actions
and in /etc/natinst/networking/ifplugd.script
. You can edit these files by using FileZilla
to access the files on the target. Figure 1 shows the location within these two files where the following rule should be added./sbin/route add -net 188.8.131.52 netmask 240.0.0.0 dev eth0;
Additionally, follow the steps below:
- Open the 'Sender VI' of the project. This will be the VI that has the UDP Multicast Open and UDP Write functions.
- Find the UDP Multicast Write-Only Open function.
- Remove the input to the net address node.