Packet [L1 ] is the name of a "Tcl extension for manipulating network packets", written by Stuart Cassoff.
escargo 13 Jan 2006 (Friday the 13th) - Dead link.
[Explain what network packets are, and UDP and TCP (and others?), and how several other extensions, as well as the built-in socket, all have capabilities.]
[ ... tclpcap, pktsrc, hping3, ... socket, ... TCP, UDP, ...]