Hi, configuration : 2 2008 Datacenter with a gigabit NIC. I got an appli using multicast UDP frame to commonicate between 2 computers. I got a problem with big frames : sendto API return no error and the good number of bytes (4300) but the frame is not sent or even not fragmented packets and sent (checked with Wireshark). I didn't found information about such issue on the net. Is anyone here knows a problem with multicasting big UDP packets ? I still invistagate and will post a minimalist sample to reproduce the problem.
