🚀 go-pugleaf

"JohnG" <whatis@email.com> wrote in message 
news:4804bc99@newsgroups.borland.com...

> I am having issues with UDP binding and UDP broadcasts.
> It appears that the binding is not enforced when broadcasting
> messages. When I bind to an IP\NIc in a multi nic system
> the message is sent across both connections and received
> by connected computers.

The Broadcast() method broadcasts to "255.255.255.255" by default, which 
sends to all available subnets.  If you are using Indy 10, then Broadcast() 
has an optional IP parameter so you can narrow down the broadcast to a 
specific subnet (Indy 9 does not have that option), ie:

    void __fastcall TForm1::ButtonSendMessageClick(TObject *Sender)
    {
        if( !IdUDPServer->Active )
            ShowMessage("UDP not enabled.");

        // 10.90.80.255 = broadcast address of the "10.90.80.xxx" subnet
        IdUDPServer->Broadcast(EditMessage->Text, 40, "10.90.80.255");
    }


Gambit