> is there a way to know how much data is received ?

The only reliable way is to read data until no more is available (The 
component is asynchronous and will /not/ block on the Receive call. It will 
simply returns the number of available bytes or -1 if no data available (0 
is returned for a TCP connection when remote has close the connection).

> i will try to put thoses RcvBuf on both side to see if it work.Beacuse 
> when
> i call the Received function, it always return 1460. even if i put a count
> larger than that.

You have to set BufSize at least equal to the largest datagram you handle.

btw: Please trim your replies to get only the relevant part.

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