xSoptik wrote: All packets are on the ethernet but I dont receive some of them. For example: There are 4 packets on the ETH but I receive only first three. That's one of the down falls to using datagram sockets (UDP). Search the MSDN for more information. Here is a quick article there detailing the potention problems. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/_core_Windows_Sockets.3a_.Ports_and_Socket_Addresses.asp[^] Hope this helps... ------------------------------- DEBUGGING : Removing the needles from the haystack.