Interesting course.

Developing, Testing, and Troubleshooting IPv4 and IPv6 Using Wireshark.
Monday, August 3 - Friday, August 7

August 3 - Day 1: An Introduction to IPv4 and IPv6
August 4 - Day 2: An Overview of Wireshark Features
August 5 - Day 3: Sniffing Your Local Network and Filtering
August 6 - Day 4: Advanced Wireshark Features and Techniques
August 7 - Day 5: Using Wireshark to Test an Embedded IPv6 Project

The Digi-Key Continuing Education Center has a series of free 45-minute online lessons. You also earn IEEE Professional Development Hours for each course.
http://www.designnews.com/lecture-calendar.asp

Free, open-source packet analyzer.
https://www.wireshark.org/