you need to create a new class that extends the ActiveRouter class, override at least the replicate method and most likely the update method too, and provide your own implementation there. Read the javadocs in the routing package for more details. Also, I suppose having a look at some of the simple routing modules (e.g., Epidemic) should give you a hint how to proceed. Then, just put your new module in use by configuring it in the configuration file. For example: Group.router = YourRoutingModuleClassName

I think developing a new protocol for final year students is too much. Better to evaluate the performance of some existing protocols based on different criteria.

I know it might be too late for Nur, but wanted to add another advice to Arash's one.

There are 4 methods in ActiveRouter.java class that will help you start to understand what is going on. Start from tryAllMessagesToAllConnections() and go your way up to startTransfer() . You can call any of these methods from your new protocol, after you have modified the list of messages that you want to send to certain connections. A very simple way to try if it is working or not, is to start with DBR. You call tryMessagesToConnections() with the list of connections, for which the other node has a smaller location.y.