On Tuesday 17 June 2003 13:54, Saikrishna Dasari wrote:

Hi Alian, I have been recording the performance statistics of UDPCast for different system setups ( i.e ..(1 server, 3 clients), ( 1 server, 8 clients), (1 server, 1 client) etc) . When I was testing the 1 Server , 1 Client configuration I connected the server and client with a direct cable inbetween and since those two machines are independent of other netwroks I was expecting no retransmission messages during the transfer..But UDPCast shows several retransmission messages . I was confused by this. Since there are only two machines that are directly hooked up by a cable there shouldn't be any network traffic or congestion related issues. and these two machines are exactly identical in every respect. I am curious to know the possible reason. Thanks in advance. Sai

There can be any number of reasons for this: bad cable, overloaded receiving machine, alpha particles from space, etc. ;-) IP is not a guaranteed delivery protocol, thus losses may happen.... The important thing to know is how many packets are lost, percentagewise. In ideal circumstances, I would expect the loss rate to be under 0.1% Alain