Rails appliction that simulates package flow between IPv6 islands through IPv4 networks. This IPv6 transition method is called tunneling and it is one of many method used to gradually introduce IPv6 instead of IPv4 protocol.
It is possible to create various scenarios. Scenario gives user possibility to add and connect nodes (computers, routers) and configure interfaces by setting IP address and IP protocol. Running a scenario will display package flow, packing from IPv4 to IPv6 protocol and vice versa, and showing where invalid package will be discarded.
App is hosted on Heroku and can be seen here.