[ppml] getting converts to V6

On 21-mei-2007, at 15:06, Randy Bush wrote:

>>> The ISP cannot simply force end users to take IPv6, there are hardly
>>> any working applications that work on that network at present.
>> That's not true. Some examples of applications that work with IPv6:

> the problem is more the ones which do not.

> if a server is v6 enabled, then ALL SERVICES must be v6 capable or  
> there are
> painful failures.

If a DNS name has an IPv6 address associated with it, then clients  
are going to try using IPv6 towards the server with that name. If a  
service then doesn't support IPv6 the clients will encounter an error  
message, which in most cases means they immediately try again over  
IPv4. But using different DNS names for different services, even if  
they're hosted on the same physical or logical server, makes it easy  
to selectively add IPv6 capability to different services. (This also  
makes it easier to move the service to another server so it's a good  
idea to do this anyway.)