Hello,
I have the same issue with my 7i96S card. It works for 2 years without problem, and once it has a communication error.
On the startup, linuxcnc shows the message you can see in the attached photo.
The fpga boots properly (led flashes, and turns off). The 5VDC power supply is ok, the ethernet cable is tested.
System is Debian 10 with LinuxCNC 2.8.4. In linux on the taskbar, the network connection shows the network is connected.
The IP jumpers are set to EEPROM (10.10.10.10).Attached photo shows the ping 10.10.10.10. results.
The IPv4 settings are attached.I see you mentioned testing a card with ip: 192.168.1.121.
Can you help me to configure the ethernet connection for this IP?
Result of the "ip a" command is attached.On the Rj45 connector just the green led lights/blinks, the yellow never (nieter during ping).
What can be with a card, can you help me to solve it?