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Ad hoc On-Demand Distance Vector (AODV) is a popular routing protocol used in ad hoc networks. OMNeT++ is a network simulation framework that allows modeling and simulating AODV networks. Here are the basic steps of how AODV networks function in OMNeT++:

1. Create the network topology: The first step is to define the network topology, i.e., the physical structure of the network, the nodes, and their connections. You can do this by writing a simple script or using a graphical user interface (GUI) to create the network.

2. Implement the AODV protocol: Next, you need to write the AODV protocol implementation code that runs on each node in the network. You can use C++, Java, or any other programming language that OMNeT++ supports.

3. Define the routing messages: AODV protocol uses several types of messages to exchange routing information between nodes. You need to define the structure of these messages in your code and how they are transmitted and handled.

4. Run the simulation: After you have implemented the AODV protocol, you can run the simulation and observe the behavior of the network. You can analyze the network performance metrics, such as throughput, delay, and packet loss, to evaluate the effectiveness of AODV in the network.

In summary, AODV networks function in OMNeT++ by creating a network topology, implementing the AODV protocol, defining the routing messages, and running simulations to evaluate the network performance.