<s>
In	O
computer	B-Architecture
networking	I-Architecture
,	O
Internet	B-Protocol
Protocol	I-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
IPCP	O
)	O
is	O
a	O
Network	O
Control	O
Protocol	O
(	O
NCP	O
)	O
for	O
establishing	O
and	O
configuring	O
Internet	B-Protocol
Protocol	I-Protocol
over	O
a	O
Point-to-Point	B-Protocol
Protocol	I-Protocol
link	O
.	O
</s>
<s>
IPCP	O
is	O
responsible	O
for	O
configuring	O
the	O
IP	O
addresses	O
as	O
well	O
as	O
for	O
enabling	O
and	O
disabling	O
the	O
IP	B-Protocol
protocol	I-Protocol
modules	O
on	O
both	O
ends	O
of	O
the	O
point-to-point	O
link	O
.	O
</s>
<s>
IPCP	O
uses	O
the	O
same	O
packet	O
exchange	O
mechanism	O
as	O
the	O
Link	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
.	O
</s>
<s>
Each	O
of	O
the	O
two	O
endpoints	O
of	O
a	O
PPP	B-Protocol
connection	I-Protocol
must	O
send	O
an	O
IPCP	O
configure	O
request	O
to	O
its	O
peer	O
because	O
the	O
TCP/IP	O
options	O
are	O
independent	O
for	O
each	O
direction	O
of	O
a	O
PPP	B-Protocol
connection	I-Protocol
.	O
</s>
<s>
In	O
practice	O
,	O
in	O
protocols	O
like	O
PPPoE	B-Protocol
which	O
is	O
commonly	O
used	O
in	O
home	O
broadband	O
connections	O
,	O
the	O
latter	O
method	O
(	O
request	O
suggestion	O
,	O
nak	O
with	O
suggestion	O
,	O
request	O
suggested	O
address	O
)	O
is	O
used	O
to	O
set	O
the	O
IP	O
address	O
of	O
the	O
ISP	O
's	O
client	O
endpoint	O
(	O
i.e.	O
</s>
<s>
the	O
customer-premises	O
equipment	O
)	O
,	O
while	O
the	O
former	O
method	O
(	O
request	O
address	O
)	O
is	O
used	O
to	O
inform	O
the	O
client	O
of	O
the	O
ISP	O
endpoint	O
IP	O
(	O
provider	B-Protocol
edge	I-Protocol
equipment	O
)	O
.	O
</s>
<s>
A	O
similar	O
NCP	O
,	O
the	O
IPv6	B-Protocol
Control	O
Protocol	O
exists	O
for	O
IPv6	B-Protocol
.	O
</s>
<s>
It	O
can	O
be	O
used	O
together	O
with	O
IPCP	O
on	O
the	O
same	O
PPP	B-Protocol
connection	I-Protocol
for	O
a	O
dual	O
stack	O
link	O
.	O
</s>
<s>
(	O
When	O
interfacing	O
newer	O
and	O
older	O
equipment	O
that	O
does	O
n't	O
support	O
IPv6	B-Protocol
one	O
sees	O
LCP	O
ProtRej	O
messages	O
for	O
protocol	O
0x8057	O
from	O
the	O
side	O
that	O
does	O
n't	O
support	O
IPV6CP	O
.	O
)	O
</s>
<s>
IPCP	O
Configuration	O
Options	O
allow	O
negotiatiation	O
of	O
desirable	O
Internet	B-Protocol
Protocol	I-Protocol
parameters	O
.	O
</s>
<s>
IPCP	O
uses	O
the	O
same	O
Configuration	O
Option	O
format	O
defined	O
for	O
LCP	O
Link	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
,	O
with	O
a	O
separate	O
set	O
of	O
Options	O
.	O
</s>
<s>
129	O
6	O
Primary	O
DNS	B-Application
Server	O
Address	O
.	O
</s>
<s>
131	O
6	O
Secondary	O
DNS	B-Application
Server	O
Address	O
.	O
</s>
<s>
In	O
the	O
Microsoft	O
implementation	O
,	O
"	O
Common	O
IPCP	O
options	O
include	O
an	O
IP	O
address	O
and	O
the	O
IP	O
addresses	O
of	O
DNS	B-Application
and	O
NetBIOS	B-Protocol
name	O
servers.	O
"	O
</s>
