When targetting Intel® Arria® 10 and Intel® Stratix® V FPGAs, the Intel® Low Latency 40- and100-Gbps Ethernet IP cores support a minimum frame size of 64 bytes as required by the IEEE specifications.
Due to the design of the Intel® 40- and 100-Gbps Ethernet IP cores, the IP cores may hang and/or behave unexpectedly for RX frames less than 64 bytes in length.