Hping is a software to do TCP/IP stack auditing, to uncover firewall policy, to scan TCP port in a lot of different modes, to transfer files accross a firewall, test network performance, test of TOS is handled, etc.
You can download it from the following link: https://packetstormsecurity.com/files/download/11415/hping2-beta53.tar.gz
Source: https://packetstormsecurity.com/files/11415/hping2-beta53.tar.gz.html