I am a beginner in Windows socket programming and I want to know, if there is some way how to create an UDP packet with no source IP address (or with some different on another network) so when it is forwarded to the destination, receiver will not be able to respond.
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No source address? No -- even a broadcast address is an address. A different source address? Yes. That's packet-spoofing, something that's used to cause trouble (a 'smurf' packetstorm, for instance; google "Smurf Attack"). You can play with that over your own LAN, but *don't* let it out onto the Internet.
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