RE: DSTM

["Bound, Jim" <jim.bound@hp.com>]

> > Some enterprises will not want 2002:: or any hard coded prefix in 
> > their sites network addresses only IPv6 aggregatable 
> address prefixes 
> > assigned to the site.  Transition will use IPv6 or IPv4 
> addresses not 
> > Transition prefixes and DSTM supports that operational model.
> 
> 	transition technology other than DSTM can support the 
> operational
> 	model.  so my question is, why DSTM is given special 
> treatment here?

DSTM is not asking for special treatment here and I don't understand why
you say that can you please provide more context why you use the phrase
"special treatment"?  Thanks.

Imagine an IPv6 production network made up of multiple links.  Only some
of the links contain legacy IPv4 applications and for this conversation
lets say they are servers.  The users policy is that IPv6 traffic is
only permitted on the majority of links and on all mission critical
links.  DSTM permits providing temporary addresses to nodes that are
required to communicate with legacy IPv4 nodes and networks by tunneling
the packet to a router that can then decap and forward IPv4 packets and
also receive them and encap them in IPv6 back to the orginating node.

Operational requirements by the user:

1.  IPv4 is not permitted to be routed on most IPv6 links or sites thus
tunneling IPv4 in IPv6 is the only option.

2.  Any address IPv6 or IPv4 must be within those assigned to the site
by operations, and all IPv6 addresses must be of the aggregate assigned
by IPv6 for any node.  This eliminates 6to4 and Teredo as two examples. 

3.  The use of IPv4 addresses for legacy communications should be
temporary IPv4 addresses for a specific time.

The objective is to use IPv6 as the dominant protocol and treat IPv4 as
legacy completely.

What other mechanism do this?

This is the strategy now by several large entities doing pre-production
network pilots and DSTM has been called out as required.  The technical
and business reasons for this operational model are not topics of the
IETF.  It is simply a requirement today as others for IPv6 deployment.

Regards,
/jim