<s>
IVI	B-Protocol
Translation	I-Protocol
refers	O
to	O
a	O
stateless	O
IPv4/IPv6	O
translation	O
technique	O
.	O
</s>
<s>
It	O
allows	O
hosts	O
in	O
different	O
address	O
families	O
(	O
IPv4	B-Protocol
and	O
IPv6	B-Protocol
)	O
communicate	O
with	O
each	O
other	O
and	O
keeps	O
the	O
end-to-end	O
address	O
transparency	O
.	O
</s>
<s>
Stateless	B-Protocol
NAT64	I-Protocol
can	O
be	O
used	O
in	O
4	O
different	O
scenarios	O
:	O
</s>
<s>
Stateless	B-Protocol
NAT64	I-Protocol
is	O
a	O
replacement	O
of	O
SIIT	O
(	O
RFC	O
6145	O
)	O
.	O
</s>
<s>
The	O
name	O
"	O
IVI	O
"	O
represents	O
the	O
number	O
4	O
(	O
IV	O
)	O
and	O
6	O
(	O
VI	O
)	O
in	O
roman	O
numerals	O
merged	O
to	O
represent	O
the	O
IPv4/IPv6	O
translation	O
.	O
</s>
<s>
Address	O
translation	O
defined	O
in	O
RFC	O
6052	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>
Header	O
translation	O
and	O
ICMP	B-Protocol
translation	O
defined	O
in	O
RFC	O
6145	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>
DNS	B-Protocol
record	O
translation	O
(	O
DNS64	O
)	O
defined	O
in	O
RFC	O
6147	O
describes	O
mapping	O
from	O
A	B-Protocol
record	I-Protocol
to	O
AAAA	B-Protocol
record	I-Protocol
defined	O
in	O
RFC	O
6052	O
.	O
</s>
<s>
Address	O
sharing	O
stateless	B-Protocol
NAT64	I-Protocol
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>
Dual	O
stateless	O
translation	O
is	O
also	O
called	O
dIVI	B-Protocol
Translation	I-Protocol
.	O
</s>
<s>
Due	O
to	O
the	O
stateless	O
nature	O
,	O
after	O
the	O
second	O
translation	O
,	O
the	O
original	O
IPv4	B-Protocol
address	I-Protocol
can	O
be	O
restored	O
.	O
</s>
<s>
The	O
advantage	O
of	O
stateless	B-Protocol
NAT464	I-Protocol
is	O
that	O
the	O
DNS64	O
and	O
application-level	O
gateway	O
(	O
ALG	O
)	O
are	O
not	O
needed	O
.	O
</s>
<s>
RFC	O
6219	O
:	O
China	O
Education	O
and	O
Research	O
Network	O
(	O
CERNET	O
)	O
'	O
s	O
IVI	B-Protocol
translation	I-Protocol
design	O
and	O
deployment	O
for	O
the	O
IPv4/IPv6	O
coexistence	O
and	O
transition	O
.	O
</s>
<s>
RFC	O
7599	O
:	O
MAP-T	B-Protocol
is	O
being	O
used	O
on	O
the	O
IPv6-only	O
"	O
CERNET2	O
"	O
,	O
expanding	O
on	O
the	O
work	O
done	O
with	O
CERNET	O
.	O
</s>
<s>
The	O
stateless	B-Protocol
NAT64	I-Protocol
also	O
forms	O
the	O
basic	O
building	O
blocks	O
for	O
stateful	O
NAT64	B-Protocol
.	O
</s>
<s>
Due	O
to	O
stateless	O
nature	O
,	O
the	O
second	O
stateless	O
translator	O
can	O
be	O
introduced	O
to	O
translate	O
the	O
IPv4-translatable	O
IPv6	B-Protocol
address	O
back	O
to	O
IPv4	B-Protocol
.	O
</s>
