Does the Ethernet Ports of CompactRIO-903x Support Jumbo Frames?

Updated Feb 21, 2019

Reported In


  • cRIO-9030
  • cRIO-9034
  • cRIO-9039
  • CompactRIO Controller
  • IC-3173

Issue Details

I want to acquire images from GigE Vision Camera to my CompactRIO-9030 (cRIO-9030). 
Is this possible? 


Yes, jumbo frames are supported in CompactRIO-903x.

Once, you plug in GigE Vision camera to one of the Ethernet port of CompactRIO, a dialog pops up asking if you want to enable jumbo frames. 
If you click "yes" on this dialog, jumbo frames are enabled and the setting is saved in the INI file, "/etc/natinst/share/ni-rt.ini". The line,  mtu="9000", is added under [eth1] section and jumbo frames are enabled.

You can also enable jumbo frames programmatically on cRIO with SSH. 
Follow this link to access the shell of NI Linux cRIO. 
Type ifconfig to check the configuration of the Ethernet ports. The default MTU(maximum transmission unit) of ports should be 1500.

In order to enable jumbo frames, change this value to a higher value such as 9000 by typing ifconfig eth1 mtu 9000. This will enable jumbo frames on the second Ethernet port. 
Verify that the change has been made to the port by the command ifconfig
This command changes jumbo frames setting temporarily. Restarting the cRIO will return MTU values to default. 

Additional Information

If you want to enable jumbo frames on Ethernet ports from powering on, you need to change the setting from NI-MAX or change the INI file or add an executable file that sets them. The following discussion forum link shows you how to do the 3rd option.

Meanwhile, Ethernet ports of cRIO-906x can only set up to MTU of 1500 so they do not support jumbo frames.