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.
42eba4cefee6cb7baf1f8c006e8b6590ca76092f8c03c8adfb52d6eebcb10ffc