Ipv4RoutingTable¶

simple module Ipv4RoutingTable

Stores the routing table. (Per-interface configuration is stored in InterfaceTable.)

For hosts, the routerId module parameter should be empty (“”), in which case the loopback IPv4 address will be set to 127.0.0.1/8. For routers which have a routerId set, the loopback address will be set to routerId. (See also RFC 2072 “Router Renumbering Guide”.)

RouterId may also be set to the string "auto", in which case the highest interface address will be chosen as routerId; the loopback address will remain 127.0.0.1/8.

The routing table is read from a file (parameter routingFile); the file can also fill in or overwrite interface settings. The file format is documented here.

Note that many protocols don’t require routerId to be routable, but some others do – so it is probably a good idea to set up routable routerIds.

This module has no gates; all functionality can be accessed via member functions of the C++ module class. For detailed info, please see the C++ documentation of the class (Doxygen).

See also: InterfaceTable

Author:: Jochen Reber

Usage diagram¶

Inheritance diagram¶

Used in compound modules¶

Name	Type	Description
ExtUpperIpv4NetworkLayer	compound module	Provides a network layer that connects the simulation to a real network on the host computer using a TUN device. Allows simulated applications to send and receive packets through the host’s networking stack at the IP layer. Contains standard components like routing table and ARP, and uses ExtUpperIpv4 with a TUN device for external connectivity.
Ipv4NetworkLayer	compound module	Network layer of an IPv4 node.

Extends¶

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

Parameters¶

Name	Type	Default value	Description
displayStringTextFormat	string	“{routingTableStatusText}”	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
interfaceTableModule	string		The path to the InterfaceTable module
routerId	string	“auto”	For routers, the router id using IPv4 address dotted
netmaskRoutes	string	“*”	Maintain netmask routes for interfaces
forwarding	bool	true	Turns IP forwarding on/off
multicastForwarding	bool	false	Turns multicast forwarding on/off
useAdminDist	bool	false	Use Cisco-like administrative distances
routingFile	string	“”	Routing table file name

Properties¶

Name	Value	Description
class	Ipv4RoutingTable
display	i=block/table

Signals¶

Name	Type	Unit	Description
mrouteAdded	inet::Ipv4MulticastRoute
mrouteChanged	inet::Ipv4MulticastRoute
mrouteDeleted	inet::Ipv4MulticastRoute
routeAdded	inet::Ipv4Route
routeChanged	inet::Ipv4Route
routeDeleted	inet::Ipv4Route

Source code¶

//
// Stores the routing table. (Per-interface configuration is stored in
// ~InterfaceTable.)
//
// For hosts, the `routerId` module parameter should be empty (""),
// in which case the loopback IPv4 address will be set to 127.0.0.1/8.
// For routers which have a `routerId` set, the loopback address will be set to
// `routerId`. (See also RFC 2072 "Router Renumbering Guide".)
//
// `RouterId` may also be set to the string `"auto"`, in which case the
// highest interface address will be chosen as `routerId`; the loopback address
// will remain 127.0.0.1/8.
//
// The routing table is read from a file (parameter `routingFile`);
// the file can also fill in or overwrite interface settings.
// The file format is documented <a href="irt.html">here</a>.
//
// Note that many protocols don't require `routerId` to be routable, but some
// others do -- so it is probably a good idea to set up routable `routerIds`.
//
// This module has no gates; all functionality can be accessed via member
// functions of the C++ module class. For detailed info, please see the C++
// documentation of the class (Doxygen).
//
// @see ~InterfaceTable
// @author: Jochen Reber
//
simple Ipv4RoutingTable extends SimpleModule like IRoutingTable
{
    parameters:
        @class(Ipv4RoutingTable);
        string interfaceTableModule;   // The path to the InterfaceTable module
        string routerId = default("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
        string netmaskRoutes = default("*"); // Maintain netmask routes for interfaces
        bool forwarding = default(true);  // Turns IP forwarding on/off
        bool multicastForwarding = default(false); // Turns multicast forwarding on/off
        bool useAdminDist = default(false);     // Use Cisco-like administrative distances
        string routingFile = default("");  // Routing table file name
        displayStringTextFormat = default("{routingTableStatusText}");
        @display("i=block/table");
        @signal[routeAdded](type=inet::Ipv4Route);
        @signal[routeDeleted](type=inet::Ipv4Route);
        @signal[routeChanged](type=inet::Ipv4Route);
        @signal[mrouteAdded](type=inet::Ipv4MulticastRoute);
        @signal[mrouteDeleted](type=inet::Ipv4MulticastRoute);
        @signal[mrouteChanged](type=inet::Ipv4MulticastRoute);
}

File: src/inet/networklayer/ipv4/Ipv4RoutingTable.ned