M2M
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
333
UPnP
Add
Port
Mapping
Scenario
Scenario
Application
Timing
When
one
client
host
in
the
Intranet
wants
to
run
peer
‐
to
‐
peer
applications,
like
multiplayer
gaming,
the
NAT
gateway
needs
the
UPnP
function
to
automatically
setup
or
remove
port
mapping
rules
in
the
gateway.
Scenario
Description
Usually,
the
active
port
service
attempt
to
access
the
gateway
from
the
Internet
will
be
ignored
by
the
gateway
for
security.
Normal
NAT
mechanism
has
the
connection
tracking
feature
to
direct
the
response
packets
from
the
Internet
back
to
the
source
end
of
request
packets
in
the
Intranet.
Once
one
application
in
the
Intranet
host
needs
an
additional
service
port
to
be
activated
at
the
WAN
interface
of
the
gateway,
it
will
ask
the
gateway
to
do
that
by
using
UPnP
protocol.
Then
the
Internet
server
can
use
the
service
port
to
contact
the
application
for
data
communication.
Parameter
Setup
Example
Содержание IDG701AM-0T001
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