> I personally hope you chose IP as a layer-3 protocol. ROTFL! Whoopsie. ;-) > You might want to decide between TCP and UDP for layer-4, though, but as ginger

> I personally hope you chose IP as a layer-3 protocol. ROTFL! Whoopsie. ;-) > You might want to decide between TCP and UDP for layer-4, though, but as gingerlime pointed out it is stupidly easy to successfully spoof UDP comms, there's not even need to have a MITM situation. Same goes for ICMP. Yes, but TCP's protections are quite weak. If you are really concerned about spoofing, you are much better off handling that with cryptographic solutions.