I'm wondering how long it is before DECnet and
Appletalk fail to work
on some modern networks because of the smart switches screwing up.
Nowadays it almost seems they expect everything to be all TCP/IP.
I've seen it happen already (although that
was an 802.3 vs Ethernet II issue, and the
later rev of the h/w was fixed).
But you are right, noone tests against anything
other than IP(v4) and noone designs new protocols
that easily accomodate anything that is not IP.
Antonio