scapyHunt - A series of Network Security puzzles and challenges designed to educate users on packet manipulation and common network attacks.
Creates a TUN/TAP interface for a software defined network, over which packets will be sent by the user- either hand crafted or using a variety of tools- in order to achieve a given objective.
Uses scapy, a Python packet manipulation library.
http://www.secdev.org/projects/scapy/
Recommended tools for use-
http://www.secdev.org/projects/scapy/ - Packet manipulation
https://www.wireshark.org/ - Packet sniffing
http://nmap.org/ - Network topography
http://www.monkey.org/~dugsong/dsniff/ - Collection of penetration testing tools, ie 'macof'
Note that some tools may require the user to specify the TUN/TAP interface, rather than a default interface.