hping3 is a network tool able to send custom ICMP/UDP/TCP packets and
to display target replies like ping does with ICMP replies. It handles
fragmentation and arbitrary packet body and size, and can be used to
transfer files under supported protocols. Using hping3, you can test
firewall rules, perform (spoofed) port scanning, test network
performance using different protocols, do path MTU discovery, perform
traceroute-like actions under different protocols, fingerprint remote
operating systems, audit TCP/IP stacks, etc. hping3 is scriptable
using the Tcl language.