Port Forwarding - can remote tell who source is?

I am looking at using Port Forwarding to encrypt traffic between
existing UNIX/Linux applications. I understand that I setup a local
port to talk to the remote application, then reconfigure my local
application client to connect to this local port.

However, once the remote server receives the incoming connection, can
it find out which machine the connection came from?
I understand that accept(), getpeername() etc would show the remote
server machine as being the originator of the connection.

TIA
Mark

.

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