<s>
The	O
Router	O
Advertisement	O
Daemon	O
(	O
radvd	B-Language
)	O
is	O
an	O
open-source	B-Application
software	I-Application
product	O
that	O
implements	O
link-local	B-Protocol
advertisements	O
of	O
IPv6	B-Protocol
router	O
addresses	O
and	O
IPv6	B-Protocol
routing	O
prefixes	O
using	O
the	O
Neighbor	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
(	O
NDP	O
)	O
as	O
specified	O
in	O
.	O
</s>
<s>
methods	O
of	O
network	O
hosts	O
on	O
Internet	B-Protocol
Protocol	I-Protocol
version	I-Protocol
6	I-Protocol
networks	O
.	O
</s>
<s>
When	O
IPv6	B-Protocol
hosts	O
configure	O
their	O
network	B-Protocol
interface	I-Protocol
controllers	I-Protocol
,	O
they	O
multicast	O
router	O
solicitation	O
(	O
RS	O
)	O
requests	O
onto	O
the	O
network	O
to	O
discover	O
available	O
routers	O
.	O
</s>
<s>
Radvd	B-Language
answers	O
requests	O
with	O
router	O
advertisement	O
(	O
RA	O
)	O
messages	O
.	O
</s>
<s>
In	O
addition	O
,	O
radvd	B-Language
periodically	O
multicasts	O
RA	O
packets	O
to	O
the	O
attached	O
link	O
to	O
update	O
network	O
hosts	O
.	O
</s>
<s>
The	O
router	O
advertisement	O
messages	O
contain	O
the	O
routing	O
prefix	O
used	O
on	O
the	O
link	O
,	O
the	O
link	O
maximum	B-Protocol
transmission	I-Protocol
unit	I-Protocol
(	O
MTU	B-Protocol
)	O
,	O
and	O
the	O
address	O
of	O
the	O
responsible	O
default	B-Protocol
router	I-Protocol
.	O
</s>
<s>
Radvd	B-Language
also	O
supports	O
the	O
recursive	O
DNS	B-Protocol
server	O
(	O
RDNSS	O
)	O
and	O
DNS	B-Protocol
search	O
list	O
(	O
DNSSL	O
)	O
options	O
for	O
NDP	O
published	O
in	O
.	O
</s>
