Mark,
A IPv6 only host has to have access to a IPv4 address to talk to IPv4 only
hosts. The simplest way to do this is to actually stay dual stack and use
DS-lite.
... the simplest (and recommended) way to do this is to use dual stack
(full stop). DS-Lite is needed in some situations, primarily if you want
to enable a v6-only ISP network and want to share one IPv4 address among
multiple subscribers. But regular dual stack works very well, too, and
is often deployed in the NATted-IPv4 and routed IPv6 configuration.
Jari
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