I am currently working on a UDP connection between an FPGA and an Ubuntu 20 host pc (firewall turned off, different NICs tested). For sending UDP packets, a custom Ethernet program is implemented on the FPGA. On the receiver side, there is a simple UDP-server receiving these packets.
The problem is, that I can not receive any packets. The simple UDP-server was tested, and it works when I am sending messages from another pc to it. To troubleshoot the FPGA, Wireshark is used to monitor the traffic. In Wireshark, every packet with its data can be seen, which means that the layers 1-4 are not responsible (wireshark record). Even the terminal command "ip -s link" showed that no packets are dropped (terminal output).
How can I find out where the packet is dropped?
Difference between working and "FPGA" UDP-packet: difference