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Apsend is a free open source Linux utility for testing firewalls. APSEND can send TCP/IP packets to test firewalls and other network applications. It also includes a syn flood option, the land DoS attack, a DoS attack against tcpdump running on a UNIX-based system, a UDP-flood attack, and a ping flood option. It currently supports the following protocols: IP, TCP, UDP, ICMP, Ethernet frames, and you can also build any other type of protocol using the generic option.