<s>
The	O
Dynamic	B-Protocol
Host	I-Protocol
Configuration	I-Protocol
Protocol	I-Protocol
version	O
6	O
(	O
DHCPv6	B-Protocol
)	O
is	O
a	O
network	O
protocol	O
for	O
configuring	O
Internet	B-Protocol
Protocol	I-Protocol
version	I-Protocol
6	I-Protocol
(	O
IPv6	B-Protocol
)	O
hosts	B-Device
with	O
IP	B-Protocol
addresses	I-Protocol
,	O
IP	B-Protocol
prefixes	I-Protocol
,	O
default	B-Protocol
route	I-Protocol
,	O
local	O
segment	O
MTU	B-Protocol
,	O
and	O
other	O
configuration	O
data	O
required	O
to	O
operate	O
in	O
an	O
IPv6	B-Protocol
network	O
.	O
</s>
<s>
It	O
is	O
the	O
IPv6	B-Protocol
equivalent	O
of	O
the	O
Dynamic	B-Protocol
Host	I-Protocol
Configuration	I-Protocol
Protocol	I-Protocol
for	O
IPv4	B-Protocol
.	O
</s>
<s>
IPv6	B-Protocol
hosts	B-Device
may	O
automatically	O
generate	O
IP	B-Protocol
addresses	I-Protocol
internally	O
using	O
stateless	O
address	O
autoconfiguration	O
(	O
SLAAC	O
)	O
,	O
or	O
they	O
may	O
be	O
assigned	O
configuration	O
data	O
with	O
DHCPv6	B-Protocol
.	O
</s>
<s>
IPv6	B-Protocol
hosts	B-Device
that	O
use	O
stateless	O
autoconfiguration	O
may	O
require	O
information	O
other	O
than	O
an	O
IP	B-Protocol
address	I-Protocol
or	O
route	O
.	O
</s>
<s>
DHCPv6	B-Protocol
can	O
be	O
used	O
to	O
acquire	O
this	O
information	O
,	O
even	O
though	O
it	O
is	O
not	O
being	O
used	O
to	O
configure	O
IP	B-Protocol
addresses	I-Protocol
.	O
</s>
<s>
DHCPv6	B-Protocol
is	O
not	O
necessary	O
for	O
configuring	O
hosts	B-Device
with	O
the	O
addresses	O
of	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
(	O
DNS	B-Protocol
)	O
servers	O
,	O
because	O
they	O
can	O
be	O
configured	O
using	O
Neighbor	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
,	O
which	O
is	O
also	O
the	O
mechanism	O
for	O
stateless	O
autoconfiguration	O
.	O
</s>
<s>
Many	O
IPv6	B-Protocol
routers	O
,	O
such	O
as	O
routers	O
for	O
residential	O
networks	O
,	O
must	O
be	O
configured	O
automatically	O
with	O
no	O
operator	O
intervention	O
.	O
</s>
<s>
Such	O
routers	O
require	O
not	O
only	O
an	O
IPv6	B-Protocol
address	O
for	O
use	O
in	O
communicating	O
with	O
upstream	O
routers	O
,	O
but	O
also	O
an	O
IPv6	B-Protocol
prefix	O
for	O
use	O
in	O
configuring	O
devices	O
on	O
the	O
downstream	O
side	O
of	O
the	O
router	O
.	O
</s>
<s>
DHCPv6	B-Protocol
prefix	B-Protocol
delegation	I-Protocol
provides	O
a	O
mechanism	O
for	O
configuring	O
such	O
routers	O
.	O
</s>
<s>
Clients	O
listen	O
for	O
DHCP	B-Protocol
messages	O
on	O
UDP	B-Protocol
port	O
546	O
.	O
</s>
<s>
Servers	O
and	O
relay	O
agents	O
listen	O
for	O
DHCP	B-Protocol
messages	O
on	O
UDP	B-Protocol
port	O
547	O
.	O
</s>
<s>
The	O
DHCP	B-Protocol
unique	O
identifier	O
(	O
DUID	O
)	O
is	O
used	O
by	O
a	O
client	O
to	O
get	O
an	O
IP	B-Protocol
address	I-Protocol
from	O
a	O
DHCPv6	B-Protocol
server	O
.	O
</s>
<s>
The	O
server	O
compares	O
the	O
DUID	O
with	O
its	O
database	O
and	O
delivers	O
configuration	O
data	O
(	O
address	O
,	O
lease	O
times	O
,	O
DNS	B-Protocol
servers	O
,	O
etc	O
.	O
)	O
</s>
<s>
It	O
defines	O
a	O
way	O
for	O
a	O
DHCPv6	B-Protocol
relay	O
to	O
pass	O
that	O
information	O
to	O
a	O
DHCPv6	B-Protocol
server	O
.	O
</s>
<s>
This	O
table	O
lists	O
the	O
DHCPv6	B-Protocol
message	O
types	O
.	O
</s>
<s>
,	O
"	O
Dynamic	B-Protocol
Host	I-Protocol
Configuration	I-Protocol
Protocol	I-Protocol
for	O
IPv6	B-Protocol
(	O
DHCPv6	B-Protocol
)	O
"	O
-	O
Obsoletes	O
RFC	O
3315	O
,	O
RFC	O
3633	O
,	O
RFC	O
3736	O
,	O
RFC	O
4242	O
,	O
RFC	O
7083	O
,	O
RFC	O
7283	O
,	O
RFC	O
7550	O
.	O
</s>
