Thus spake "Iljitsch van Beijnum" <[EMAIL PROTECTED]> > For any particular application and group of users, and in order to > switch over seamlessly, it is necessary that all servers become dual > stack, then clients can switch (without the need to run dual stack) and > after that the servers can drop IPv4.
That is one scenario; there are others. > And for peer-to-peer, _everyone_ is a server so _everyone_ has to > run dual stack before it's possible to drop IPv4. Out of curiosity I sniffed my own P2P applications and found that over 50% of the hosts my client tried to contact weren't available, presumably due to NATs, firewalls, or other connectivity impediments. In spite of this problem, the P2P networks work well enough nobody cares about the problem. I conclude, therefore, that as long as a sizable minority of P2P users are dual stack, the majority can safely speak only v4 or only v6. S Stephen Sprunk "God does not play dice." --Albert Einstein CCIE #3723 "God is an inveterate gambler, and He throws the K5SSS dice at every possible opportunity." --Stephen Hawking
