Why are packets being lost when using UDP socket?

[Eng Born]

Greeting,

I am using 2 PC connected to Netgear router. So, UDP should be as reliable as regular socket. I am using QT C++ SDK to write the program. Both PC run on Window 7.

Are there any explanation why some packets are lost?

Thanks,
Eng

[Sean Pedersen]

UDP is a broadcast mode. TCP is more reliable because it requires a "handshake" between the client and server, while broadcast packets don't.