Easy-EIGRP is an implementation of the Enhanced Interior Gateway Routing Protocol developed in Java. It has a user-friendly and flexible graphical user interface that allows users to configure all relevant aspects of the network and the protocol.
It doesn't work for me under Ubuntu 14.04. :-(
Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: no jpcap in java.library.path
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You can form some adjacencies with real Cisco Routers or use GNS3.
You need to know that the IOS version used was 12.4 and the implemented protocol version is 1.2, so it will only work correctly with routers that provide this version. The application must be installed and run as root/administrator user since it requires the execution of privileged commands.
In case that you want to simulate Cisco Routers using GNS3, you have to use the IOS image: c3640-ik9o3s-mz.124-7.