Messages TCP/IP with id (key) of sender

Hello all:
Is possible to modify (to take part) a tcp package in order to know the sender?
Since the IP of client are dynamics, I can't to use them with clientSocket.getInetAddress() for example. Also is not possible to modify the message (data bytes).
Any comment will be appreciated, regards,
Ulises

Socket.getInetAddress() of an accepted socket returns the source IP address from the TCP header of the client's connect handshake. I don't see why that would be a problem if the client's address is dynamic.
It would be a problem if there is an intervening NAT device, in which case you will only get the IP address of the NAT device and you are out of luck as far as the TCP protocol itself is concerned. In this case you will have to build in the client's address into your application protocol, but on the other hand the client's real address isn't reallu much use to you because (a) you can't reach it without special arrangements with the NAT device and (b) it is almost certainly not unique.

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