is a tool for monitoring networks. It offers a wide range of network discovery utilities like arp lookup on an IP range, spoofed DHCP request, RARP, BOOTP, ICMP-ping, ICMP address mask request, OS fingerprinting, high-speed host discovery, ...
thcrut arp 10.10.10.1-10.10.10.20
scan a network with arp-discovery.
is a discovery tool for unauthorized request on MAC address. Some more info manpage
a packet generator (IPv4, IPv6, NTP, BGP, RIP, TCP, UDP, ICMP, ...). Some complex, but very usefull packet genrator (see manpage)
Attention: the order of parameter is important to build correct packet ;)
is an anonymous proxy. Tor is a network of virtual tunnels that allows people and groups to improve their privacy and security on the Internet. It also enables software developers to create new communication tools with built-in privacy features. Tor provides the foundation for a range of applications that allow organizations and individuals to share information over public networks without compromising their privacy.
knockd is a port-knock server. It listens to all traffic on an ethernet (or PPP) interface, looking for special "knock" sequences of port-hits. A client makes these port-hits by sending a TCP (or UDP) packet to a port on the server. This port need not be open -- since knockd listens at the link-layer level, it sees all traffic even if it's destined for a closed port. When the server detects a specific sequence of port-hits, it runs a command defined in its configuration file. This can be used to open up holes in a firewall for quick access.