<s>
4in6	B-Protocol
refers	O
to	O
tunneling	O
of	O
IPv4	B-Protocol
in	O
IPv6	B-Protocol
.	O
</s>
<s>
It	O
is	O
an	O
Internet	O
interoperation	O
mechanism	O
allowing	O
Internet	B-Protocol
Protocol	I-Protocol
version	I-Protocol
4	I-Protocol
(	O
IPv4	B-Protocol
)	O
to	O
be	O
used	O
in	O
an	O
IPv6	B-Protocol
only	O
network	O
.	O
</s>
<s>
4in6	B-Protocol
uses	O
tunneling	O
to	O
encapsulate	O
IPv4	B-Protocol
traffic	O
over	O
configured	O
IPv6	B-Protocol
tunnels	O
as	O
defined	O
in	O
.	O
</s>
<s>
4in6	B-Protocol
tunnels	O
are	O
usually	O
manually	O
configured	O
but	O
they	O
can	O
be	O
automated	O
using	O
protocols	O
such	O
as	O
TSP	B-Protocol
to	O
allow	O
easy	O
connection	O
to	O
a	O
tunnel	B-Protocol
broker	I-Protocol
.	O
</s>
