I have a WIZNET812MJ Connected to Atmega 644P. My Wiznet can send many UDP packets without problem (also TCP as well). The problem arises when the Wiznet try to receive UDP packets.
I use wireshark to analyze, weird results:-
Reply from Wiznet
ICMP Desination unreachable (Port unreachable)
I try to use many different port numbers but same.
I checked to make sure the dest and receiving side port numbers are the same.
I even disable all interrupts but no difference.
Pls help, thanks.