Provides IPv4 layer functionality for network emulation that connects simulated applications to a real network on the host computer. Uses a real TUN device on the host OS to capture and inject packets at the IP layer, allowing simulated applications to communicate with real-world network endpoints through the host's networking stack.

Usage diagram

The following diagram shows usage relationships between types. Unresolved types are missing from the diagram.

Inheritance diagram

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

Gates

Name	Direction	Size	Description
transportIn	input
transportOut	output
queueIn	input
queueOut	output

Unassigned submodule parameters

Name	Type	Default value	Description
tun.displayStringTextFormat	string	""	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
tun.device	string
tun.namespace	string	""
tun.packetNameFormat	string	"Ext"

Source code

//
// Provides IPv4 layer functionality for network emulation that connects
// simulated applications to a real network on the host computer. Uses a real
// TUN device on the host OS to capture and inject packets at the IP layer,
// allowing simulated applications to communicate with real-world network
// endpoints through the host's networking stack.
//
module ExtUpperIpv4 like IIpv4
{
    gates:
        input transportIn @labels(Ipv4ControlInfo/down,TcpHeader,UdpHeader,SctpHeader);
        output transportOut @labels(Ipv4ControlInfo/up,TcpHeader,UdpHeader,SctpHeader);
        input queueIn @labels(Ipv4Header,ArpPacket,Ieee802Ctrl);
        output queueOut @labels(Ipv4Header,ArpPacket,Ieee802Ctrl);
    submodules:
        tun: ExtIpv4TunDevice {
            parameters:
                @display("p=100,150");
        }
    connections allowunconnected:
        queueIn --> tun.lowerLayerIn;
        queueOut <-- tun.lowerLayerOut;
}

File: src/inet/emulation/networklayer/ipv4/ExtUpperIpv4.ned

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