
I am sending udp packets from one pc to other. I am observing the traffic on wireshark on the pc where I am receiving udp packets. One interesting thing I see is icmp packets appearing suddenly. Then they disappear and again appear in a cyclic manner. What can be the reason for this. Am I doing some thing wrong. And what bad effects can it have on my udp reception performance.
Please also find the attached wireshark figure taken from the destination pc.
The ICMP packets are created by the other host because the UDP port is not open. The ICMP packet includes the first X bytes of the packet that was dropped so the sender can read out which session was affected.