Hi!
I have a client-server application, where the server sends UDP datagrams to the
client, and the client measures the speed of the channel. These datagrams are
sent using the following code:
case userid of
1: begin us:=mainform.udpsock1;us.LocalPort:='4001';end;
2: begin us:=mainform.udpsock2;us.LocalPort:='4002';end;
3: begin us:=mainform.udpsock3;us.LocalPort:='4003';end;
4: begin us:=mainform.udpsock4;us.LocalPort:='4004';end;
5: begin us:=mainform.udpsock5;us.LocalPort:='4005';end;
6: begin us:=mainform.udpsock6;us.LocalPort:='4006';end;
7: begin us:=mainform.udpsock7;us.LocalPort:='4007';end;
8: begin us:=mainform.udpsock8;us.LocalPort:='4008';end;
9: begin us:=mainform.udpsock9;us.LocalPort:='4009';end;
10: begin us:=mainform.udpsock10;us.LocalPort:='4010';end;
end;
us.Proto:='udp';
us.Addr:=remoteip[userid];
us.Port:=remoteport[userid];
us.Connect;
us.Send(sendbuffer[userid],blocksize[userid]);
us.Close;
My problem is: I want that the server only uses one port for sending these
datagrams (to save resources), that's what I tried to set in LocalPort
property. But there is no use of this, the server gives a new source port
randomly for every datagram between 4000 and 5000. The destination port on the
client side is constantly 5000, that is what I set.
Is there any way to limit the server side to use just one port for sending,
then reuse the same port? There are about 5-10 datagrams sent per second, so we
run out of resources quite quickly.
Thanks for your help:
Andras
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