vb.net and sockets bug?

Why does VB.NET UDP sockets send data on random ports?. If I set a simple
socket up to transmit a UDP packet on a port, look at the packet with a
sniffer, the actual packets source port and dest.port are diff. The packets
destination port is correct, but the packets source port it is actually sent
from is random. Why? How can I figure out the actual source port windows is
using, not what the vb.net socket is fake reporting?
Thanks BUC


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