<s>
Internet	B-Protocol
Gateway	I-Protocol
Device	I-Protocol
(	O
IGD	O
)	O
Standardized	O
Device	O
Control	O
Protocol	O
is	O
a	O
protocol	O
for	O
mapping	O
ports	B-Protocol
in	O
network	B-Protocol
address	I-Protocol
translation	I-Protocol
(	O
NAT	O
)	O
setups	O
,	O
supported	O
by	O
some	O
NAT-enabled	O
routers	B-Protocol
.	O
</s>
<s>
It	O
is	O
a	O
common	O
communications	O
protocol	O
for	O
automatically	O
configuring	O
port	B-Protocol
forwarding	I-Protocol
,	O
and	O
is	O
part	O
of	O
an	O
ISO/IEC	O
Standard	O
rather	O
than	O
an	O
Internet	O
Engineering	O
Task	O
Force	O
standard	O
.	O
</s>
<s>
Universal	B-Application
Plug	I-Application
and	I-Application
Play	I-Application
(	O
UPnP	B-Application
)	O
comes	O
with	O
a	O
solution	O
for	O
network	B-Protocol
address	I-Protocol
translation	I-Protocol
traversal	O
(	O
NAT	B-Protocol
traversal	I-Protocol
)	O
that	O
implements	O
IGD	O
.	O
</s>
<s>
The	O
host	B-Device
can	O
allow	O
seeking	O
for	O
available	O
devices	O
on	O
the	O
network	O
via	O
Simple	B-Protocol
Service	I-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
(	O
SSDP	O
)	O
which	O
can	O
be	O
controlled	O
then	O
with	O
the	O
help	O
of	O
a	O
network	O
protocol	O
such	O
as	O
SOAP	B-Application
.	O
</s>
<s>
A	O
seek	O
request	O
is	O
sent	O
via	O
HTTP	B-Protocol
and	O
port	B-Protocol
1900	O
to	O
the	O
multicast	B-Protocol
address	I-Protocol
239.255.255.250	B-Protocol
:	O
</s>
