Large queues on the Internet are traditionally needed to provide high utilization of network traffic, however it comes at the cost of high delay. DualPI2 is an Active Queue Management (AQM) proposal which attempts to allow scalable TCP traffic to co-exist with traditional TCP, allowing both high utilization and low delay. This thesis presents a test framework that can be used to evaluate AQMs and congestion controls, being capable of simulating a full testbed on a single machine. The test framework is used to evaluate DualPI2 trying to find areas where it might break and need improvements. I find that the test framework is very useful in investigating and analyzing the behaviour of DualPI2, and that there are still some scenarios that should be considered for improvements.