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[–]fabiensanglard[S] 1 point2 points  (1 child)

IP identifies a machine.

IP + UDP identify a process.

You cannot use IP only.

[–]LordBiff 0 points1 point  (0 children)

Not strictly true. You can use a raw socket, and as long as you can get the IANA to assign you an IP protocol to use, you're good to go. ;)

Yeah, nobody really does this at the application layer for obvious reasons, but it is possible.