hping2 is a network tool which sends custom ICMP/UDP/TCP packets and displays target replies like ping does with ICMP replies. hping2 can handle fragmentation, arbitrary packet body and size and can be used in order to transfer files under any supported protocol. hping2 is useful for testing firewall rules, spoofed port scanning, testing network performance under different protocols, packet sizes, TOS, and fragmentation, path MTU discovery, file transfer even with really facist firewall rules, traceroute with different protocols, firewalk like usage, remote OS fingerprinting, TCP/IP stack auditing, and much more.
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