In order to simulate randomness of traffic, I started the sending and receiving applications at random time...
Then I observed unanticipated packet drops. These were observed even at the sourcing rate 0.1Mbps with link speed 100Mbps..!!
Packet dumps revealed that there were ICMP unreachable packets sending back.
Those unanticipated dropped packets were all the first packet sent from sources, but not all first packets were dropped.
After 2 or 3 hours debugging, now found the reasons.
I started some receivers AFTER the senders due to randomly starting BOTH senders and receivers.... no wonder there were some packets sent but found no receivers....
So stupid.......
Ai.... I am still at school now....
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