There are situations where firewalls are too restrictive, making it inconvenient for users. For example, many companies and schools enforce egress filtering, which blocks users inside of their networks from reaching out to certain websites or Internet services, such as game and social network sites. There are many ways to evade firewalls. A typical approach is to use the tunneling technique, which hides the real purposes of network traffic. There are a number of ways to establish tunnels. The two most common tunneling techniques are Virtual Private Network (VPN) and port forwarding. The goal of this lab is to help students gain hands-on experience on these two tunneling techniques.
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