<s>
dIVI	B-Protocol
Translation	I-Protocol
refers	O
to	O
a	O
dual	O
stateless	O
IPv4/IPv6	O
translation	O
technique	O
.	O
</s>
<s>
dIVI	O
is	O
an	O
extension	O
of	O
1:1	O
stateless	O
IPv4/IPv6	O
translation	O
(	O
IVI	B-Protocol
Translation	I-Protocol
)	O
with	O
features	O
of	O
IPv4	B-Protocol
address	I-Protocol
sharing	O
and	O
dual	O
translation	O
.	O
</s>
<s>
dIVI	B-Protocol
Translation	I-Protocol
is	O
intended	O
to	O
benefit	O
the	O
network	O
operators	O
(	O
ISPs	O
)	O
to	O
effectively	O
share	O
the	O
public	O
IPv4	B-Protocol
addresses	O
among	O
a	O
set	O
of	O
customers	O
(	O
since	O
IANA	O
has	O
run	O
out	O
of	O
public	O
IPv4	B-Protocol
addresses	O
)	O
.	O
</s>
<s>
In	O
parallel	O
,	O
it	O
leverages	O
IPv6	B-Protocol
in	O
the	O
network	O
in	O
a	O
manner	O
that	O
makes	O
IPv4-customer	O
originated	O
traffic	O
looks	O
like	O
native	O
IPv6	B-Protocol
traffic	O
in	O
the	O
network	O
,	O
resulting	O
in	O
simplified	O
operations	O
.	O
</s>
<s>
Address	O
translation	O
defined	O
in	O
RFC6052	O
is	O
a	O
stateless	O
mapping	O
scheme	O
,	O
which	O
embeds	O
IPv4	B-Protocol
address	I-Protocol
in	O
network	O
specific	O
IPv6	B-Protocol
prefix	O
and	O
forms	O
IPv4-converted	O
and	O
IPv4-translatable	O
addresses	O
.	O
</s>
<s>
The	O
IPv4-converted	O
IPv6	B-Protocol
addresses	O
are	O
the	O
IPv6	B-Protocol
addresses	O
used	O
to	O
represent	O
IPv4	B-Protocol
nodes	O
in	O
an	O
IPv6	B-Protocol
network	O
.	O
</s>
<s>
The	O
IPv4-translatable	O
IPv6	B-Protocol
addresses	O
are	O
the	O
IPv6	B-Protocol
addresses	O
assigned	O
to	O
IPv6	B-Protocol
nodes	O
for	O
use	O
with	O
stateless	O
translation	O
.	O
</s>
<s>
Suffix	O
extension	O
enables	O
multiple	O
IPv6	B-Protocol
nodes	O
sharing	O
a	O
single	O
public	O
IPv4	B-Protocol
address	I-Protocol
,	O
with	O
each	O
node	O
managing	O
a	O
different	O
range	O
of	O
ports	O
.	O
</s>
<s>
Header	O
translation	O
and	O
ICMP	B-Protocol
translation	O
defined	O
in	O
RFC6145	O
are	O
algorithms	O
to	O
perform	O
header	O
translation	O
between	O
IPv4	B-Protocol
and	O
IPv6	B-Protocol
,	O
as	O
well	O
as	O
between	O
ICMP	B-Protocol
and	O
ICMPv6	B-Protocol
.	O
</s>
<s>
Dual	O
stateless	O
translation	O
can	O
restore	O
original	O
IPv4	B-Protocol
address	I-Protocol
.	O
</s>
<s>
The	O
advantage	O
of	O
stateless	B-Protocol
NAT464	I-Protocol
is	O
that	O
the	O
DNS	O
translation	O
DNS64	O
and	O
application	O
layer	O
gateway	O
ALG	O
are	O
not	O
needed	O
.	O
</s>
<s>
Due	O
to	O
the	O
stateless	O
nature	O
,	O
the	O
dual	O
stateless	O
translation	O
can	O
easily	O
become	O
single	O
stateless	O
translation	O
by	O
removing	O
the	O
second	O
translator	O
,	O
see	O
IVI	B-Protocol
Translation	I-Protocol
.	O
</s>
