M2M
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
205
SPI
Scenario
Scenario
Application
Timing
Users
in
Network
‐
A
initiate
to
access
cloud
server
through
Gateway
which
records
connected
sessions.
Sometimes,
unknown
users
will
simulate
the
Packet
but
use
different
Src
IP
to
masquerade.
Scenario
Description
In
order
to
prevent
security
leak
when
local
users
surf
the
internet.
Parameter
Setup
Example
Following
tables
list
the
parameter
configuration
as
an
example
for
the
gateway
in
above
diagram
with
"SPI"
enabling.
Configuration
Path
[Options]
‐
[Firewall
Options]
SPI
■
Enable
Scenario
Operation
Procedure
In
above
diagram,
the
Gateway
is
the
gateway
of
Network
‐
A
and
the
subnet
of
its
Intranet
is
10.0.75.0/24.
The
gateway
has
the
IP
address
of
10.0.75.2
for
LAN
interface
and
118.18.81.200
for
WAN
interface.
It
serves
as
a
NAT
router.
Activate
the
SPI
feature
at
the
Gateway.
Users
in
Network
‐
A
initiate
to
access
cloud
server
through
Gateway.
Sometimes,
unknown
users
will
simulate
the
Packet
but
use
different
Src
IP
to
masquerade.
System
will
block
such
packets
from
unknown
users.
