NED File src/inet/applications/tunapp/TunLoopbackApp.ned

Name	Type	Description
TunLoopbackApp	simple module	Provides loopback functionality for a TUN interface by receiving packets, swapping source and destination addresses and ports, and sending them back through the same interface. Processes both network and transport layer headers to properly reverse packet direction. Useful for testing network configurations and protocols without requiring external connections.

Source code

//
// Copyright (C) 2015 Irene Ruengeler
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//

package inet.applications.tunapp;

import inet.common.SimpleModule;
import inet.applications.contract.IApp;

//
// Provides loopback functionality for a TUN interface by receiving packets,
// swapping source and destination addresses and ports, and sending them back
// through the same interface. Processes both network and transport layer
// headers to properly reverse packet direction. Useful for testing network
// configurations and protocols without requiring external connections.
//
// @see TunInterface
//
simple TunLoopbackApp extends SimpleModule like IApp
{
    parameters:
        @class(TunLoopbackApp);
        string interfaceTableModule;
        string tunInterface;
        @display("i=block/app");
    gates:
        input socketIn @labels(TunInterface/up);
        output socketOut @labels(TunInterface/down);
}