In message <4C001BD5(_dot_)4020006(_at_)piuha(_dot_)net>, Jari Arkko writes:
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
The simplest thing for the medium term is full dual stack, but at
some point one is going to need to share IPv4 addresses between
different customers and DS-lite will break less things than NAT64.
Any box that supports tunnelling IPv4 in IPv6 can be the B4 component
with a little bit of tweaking. DS-lite also keeps all the internal
IPv4 legacy boxes working.
By tweaking I mean configuring the DHCPv6 client to request the
appropriate option then calling out to configure the tunnel and
IPv4 routing table.
If one is trying to reduced the size of the IP stack on the client
(e.g. in a phone) then NAT64 may be a better alternative but for
home users it really isn't.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka(_at_)isc(_dot_)org
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