I've developed a communication software  in Visual Basic that sends data
inside a LAN. I use the Mswinsck.ocx and the Winsock32.dll. There is no
problem as long as I do not connect to the internet. After a connection via
modem is finished the next data send takes exactly 1 minute - even for a few
bytes. Before and during surfing in the internet there isn't any problem.
It seems that the send is tried via modem, which isn't ready, and after time
out LAN is tried.
Who and what is changed by the modem connection? How can I avoid it?

Can you help me?