In message <200004122207(_dot_)RAA07804(_at_)gungnir(_dot_)fnal(_dot_)gov>,
Matt Crawford typed:
The source address of a datagram was an architectural mistake, and should
never have been in the mandatory packet format.
Nahh, the mistake was ignoring the source address when routing & forwarding.
thats an implementation detail not a design mistake.
there's plenty of fast classifier algorithms and data structures now
for the 5-tuple which reender this debate academic - in fact, i think
the lack of a idee fixe about flow id, versus src or dst or src+dst
based routing, versus route hint +eid and so on is the _strength_ of
the tcp/.ip model- the very lack lack of strong noel complains about
foresight led to diversity and design freedom....
cheers
jon