Broadcast a UDP message in LAN with fake source IP with delphi

I want to broadcast a UDP message in my LAN with fake source IP ( spoofing ) 1. Do winpcap able to do this ? 2. Do this work on winxp, win7 ? 3. i'm开发者_运维问答 using delphi, is there any good components available ?

Thanks.

Yes, you can do this with winpcap. It should work on Windows 7 (though you may have to get a beta version of it). This is all I could find for doing it in delphi:

http://www.magsys.co.uk/delphi/magmonsock.asp

I don't know how well that works with the latest version of winpcap though. I'd seriously consider just doing it in C or C++.

Since your goal is to allow UDP broadcast in the VPN I suggest to take a look at VPN solutions that does not drop those packets such as Hamachi or Gamer's Internet Tunnel instead of creating your own solution.