C++ definition

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.

<b>See also:</b> TunInterface

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Extends

Name	Type	Description
SimpleModule	simple module	Base module for all INET simple modules.

Parameters

Name	Type	Default value	Description
displayStringTextFormat	string	""	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
interfaceTableModule	string
tunInterface	string

Properties

Name	Value	Description
class	TunLoopbackApp
display	i=block/app

Gates

Name	Direction	Size	Description
socketIn	input
socketOut	output

Source code

//
// 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);
}

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

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