Network layer of an IPv4 node.

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.

Used in compound modules

Name	Type	Description
LdpMplsRouter	compound module	An LDP-capable router.
RsvpMplsRouter	compound module	An RSVP-TE capable router.

Parameters

Name	Type	Default value	Description
forwarding	bool	false
multicastForwarding	bool	false
interfaceTableModule	string
displayStringTextFormat	string	"%i"

Properties

Name	Value	Description
class	::inet::Ipv4NetworkLayer
display	i=block/fork

Gates

Name	Direction	Size	Description
ifIn	input
ifOut	output
transportIn	input
transportOut	output

Unassigned submodule parameters

Name	Type	Default value	Description
routingTable.interfaceTableModule	string		The path to the InterfaceTable module
routingTable.routerId	string	"auto"	for routers, the router id using IPv4 address dotted notation; specify "auto" to select the highest interface address; should be left empty ("") for hosts
routingTable.netmaskRoutes	string	"*"	maintain netmask routes for interfaces
routingTable.forwarding	bool	true	turns IP forwarding on/off
routingTable.multicastForwarding	bool	false	turns multicast forwarding on/off
routingTable.useAdminDist	bool	false	Use Cisco like administrative distances
routingTable.routingFile	string	""	routing table file name
natTable.networkProtocolModule	string	"^.ip"
natTable.config	xml	xml("")	XML configuration parameters for network address translation
icmp.interfaceTableModule	string		The path to the InterfaceTable module
icmp.routingTableModule	string
icmp.crcMode	string	"declared"

Source code

//
// Network layer of an IPv4 node.
//
//
module Ipv4NetworkLayer like INetworkLayer
{
    parameters:
        bool forwarding = default(false);
        bool multicastForwarding = default(false);
        string interfaceTableModule;
        string displayStringTextFormat = default("%i");
        *.forwarding = forwarding;
        *.multicastForwarding = multicastForwarding;
        *.interfaceTableModule = default(absPath(interfaceTableModule));
        *.routingTableModule = default(absPath(".routingTable"));
        *.arpModule = default(absPath(".arp"));
        *.icmpModule = default(absPath(".icmp"));
        @class(::inet::Ipv4NetworkLayer);
        @display("i=block/fork");

    gates:
        input ifIn @labels(INetworkHeader);
        output ifOut @labels(INetworkHeader);
        input transportIn @labels(Ipv4ControlInfo/down);
        output transportOut @labels(Ipv4ControlInfo/up);

    submodules:
        configurator: <default("Ipv4NodeConfigurator")> like IIpv4NodeConfigurator if typename != "" {
            parameters:
                @display("p=100,100;is=s");
        }
        routingTable: Ipv4RoutingTable {
            parameters:
                @display("p=100,200;is=s");
        }
        natTable: Ipv4NatTable {
            parameters:
                @display("p=100,300;is=s");
        }
        up: MessageDispatcher {
            parameters:
                @display("p=550,100;b=600,5");
        }
        igmp: <default("Igmpv2")> like IIgmp {
            parameters:
                @display("p=400,200");
        }
        icmp: Icmp {
            parameters:
                @display("p=700,200");
        }
        mp: MessageDispatcher {
            parameters:
                @display("p=550,300;b=600,5");
        }
        ip: <default("Ipv4")> like IIpv4 {
            parameters:
                @display("p=700,400;q=queue");
        }
        arp: <default("Arp")> like IArp {
            parameters:
                @display("p=400,400;q=pendingQueue");
        }
        lp: MessageDispatcher {
            parameters:
                @display("p=550,500;b=600,5");
        }

    connections allowunconnected:
        transportIn --> { @display("m=n"); } --> up.in++;
        transportOut <-- { @display("m=n"); } <-- up.out++;

        up.out++ --> igmp.routerIn;
        up.in++ <-- igmp.routerOut;

        up.out++ --> mp.in++;
        up.in++ <-- mp.out++;

        up.out++ --> icmp.transportIn;
        up.in++ <-- icmp.transportOut;

        igmp.ipOut --> mp.in++;
        igmp.ipIn <-- mp.out++;

        icmp.ipOut --> mp.in++;
        icmp.ipIn <-- mp.out++;

        mp.out++ --> ip.transportIn;
        mp.in++ <-- ip.transportOut;

        arp.ifOut --> lp.in++;
        arp.ifIn <-- lp.out++;

        ip.queueOut --> lp.in++;
        ip.queueIn <-- lp.out++;

        lp.out++ --> { @display("m=s"); } --> ifOut;
        lp.in++ <-- { @display("m=s"); } <-- ifIn;
}

File: src/inet/networklayer/ipv4/Ipv4NetworkLayer.ned

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