Paketto Keiretsu

http://www.doxpara.com/ (temporary link)

These are a set of utilities for doing odd things to TCP/IP networks by
"stretching the protocols beyond their original intent".  They include a
particularly fast stateless service and topology scanner, a userspace
NAT/MAT ("MAC Address Translation") router with interesting features
(like "guerilla multicast"), a traceroute-like utility that piggybacks
on existing TCP connections, 3-D phase space visualization tools, and
other tasty goodies.
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