Configures IPv4 addresses and routing tables for a "flat" network, "flat" meaning that all hosts and routers will have the same network address and will only differ in the host part.

This module does't connect to any other modules (it has no gates), and should have only one instance in the whole model. The module will only run once, at the beginning of the simulation. When it runs, it will:

1. assign IPv4 addresses to hosts and routers. All hosts and routers will be in the same network (same network address). For simplicity, it will assign the same address to all interfaces of a router;
2. then it'll discover the topology of the network (using OMNeT++'s cTopology class), and calculate shortest paths;
3. finally, it will add routes which correspond to the shortest paths to the routing tables (see Ipv4RoutingTable::addRoutingEntry()).

How does it know which modules are routers, hosts, et.c that need to be configured, and what is the network topology? The configurator picks all modules which have a @networkNode property and their connections, and builds a graph from it. Then it runs Dijstra's shortest path algorithm on it, and configures all modules which are IPv4 nodes.

It is assumed that the routing table (Ipv4RoutingTable module) is the "routingTable" or "networkLayer.routingTable" submodule in all hosts and routers.

To avoid interference with the above algorithm, it's recommended that no host or router should have its address set explicitly, and no routes are set up manually. Practically, routing files (.irt, .mrt) should be absent or empty.

All the above takes place in initialization stage 2. (In stage 0, interfaces register themselves in the InterfaceTable modules, and in stage 1, routing files are read.)

Inheritance diagram

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

Parameters

Name	Type	Default value	Description
networkAddress	string	"192.168.0.0"	network part of the address (see netmask parameter)
netmask	string	"255.255.0.0"	host part of addresses are autoconfigured

Properties

Name	Value	Description
display	i=block/cogwheel
labels	node

Source code

//
// Configures IPv4 addresses and routing tables for a "flat" network,
// "flat" meaning that all hosts and routers will have the same
// network address and will only differ in the host part.
//
// This module does't connect to any other modules (it has no gates),
// and should have only one instance in the whole model. The module
// will only run once, at the beginning of the simulation.
// When it runs, it will:
//
//   -#  assign IPv4 addresses to hosts and routers. All hosts and
//       routers will be in the same network (same network address).
//       For simplicity, it will assign the same address to all interfaces
//       of a router;
//   -#  then it'll discover the topology of the network (using OMNeT++'s
//       cTopology class), and calculate shortest paths;
//   -#  finally, it will add routes which correspond to the shortest
//       paths to the routing tables (see Ipv4RoutingTable::addRoutingEntry()).
//
// How does it know which modules are routers, hosts, et.c that need to
// be configured, and what is the network topology? The configurator
// picks all modules which have a @networkNode property and their connections,
// and builds a graph from it. Then it runs Dijstra's
// shortest path algorithm on it, and configures all modules which are
// IPv4 nodes.
//
// It is assumed that the routing table (~Ipv4RoutingTable module) is the
// "routingTable" or "networkLayer.routingTable" submodule in all hosts
// and routers.
//
// To avoid interference with the above algorithm, it's recommended that
// no host or router should have its address set explicitly, and
// no routes are set up manually. Practically, routing files (.irt, .mrt)
// should be absent or empty.
//
// All the above takes place in initialization stage 2. (In stage 0,
// interfaces register themselves in the ~InterfaceTable modules, and
// in stage 1, routing files are read.)
//
simple Ipv4FlatNetworkConfigurator like IL3NetworkConfigurator
{
    parameters:
        string networkAddress = default("192.168.0.0"); // network part of the address (see netmask parameter)
        string netmask = default("255.255.0.0"); // host part of addresses are autoconfigured
        @display("i=block/cogwheel");
        @labels(node);
}

File: src/inet/networklayer/configurator/ipv4/Ipv4FlatNetworkConfigurator.ned

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