LinuxCNC Mesa card and network

Hello, When linuxcnc run (with a mesa card) it is not possible to use the network.
As I see on forum I installed network-manager but this doesn't solve the problem.

When I run linuxcnc, I am unable to ping the local router...

How can I solve this issue ?

Many thanks for your help.
Best regards
 

Does it have 1 or 2 network cards?
With one, you can not use Mesa and Internet.
With 2, you can use both at the same time.
Since you gave no info, i can not offer more help for now.
P.S.
1 ethernet RJ45 and 1 wireless/WiFi also can be used at the same time with network manager, not with WiCD.

Many thanks for your reply. The machine has only one ethernet interface. I am very surprised that it can not be possible to use the ethernet when linux cnc is running.
How can I load the gcode file in the Linuxcnc application? Is that some alternative? I see on a forum that installing network manager solve the issue, but not for me...

Does it have WiFi?

No wifi....
I don't understand why the ethernet connection is 'blocked' when linux cnc run. Is that a linuxcnc design? Is it a possible to load a file from the network?

Use a USB drive
Or USB WiFi
Or USB network card