M2M
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
285
Internet
traffic
from
GRE
client
site
is
handled.
Parameter
Setup
Example
For
Network
‐
B
at
Branch
Office
Following
2
tables
list
the
parameter
configuration
for
above
example
diagram
of
GRE
VPN
server
in
Network
‐
B.
Use
default
value
for
those
parameters
that
are
not
mentioned
in
these
tables.
Configuration
Path
[GRE]
‐
[Configuration]
GRE
■
Enable
Configuration
Path
[GRE]
‐
[GRE
Rule
Configuration]
Tunnel
Name
GRE
BO
Interface
WAN
1
Operation
Mode
Always
on
Tunnel
IP
118.18.81.33
Remote
IP
203.95.80.22
Key
1234
TTL
255
Default
Gateway/Remote
Subnet
Default
Gateway
Tunnel
■
Enable
Scenario
Operation
Procedure
In
above
diagram,
Network
‐
A
is
in
the
headquarters,
and
the
subnet
of
its
Intranet
is
10.0.76.0/24.
The
security
gateway
for
Network
‐
A
has
the
IP
address
of
10.0.76.2
for
LAN
interface
and
203.95.80.22
for
WAN
interface.
It
serves
as
a
GRE
server.
However,
Network
‐
B
is
in
the
branch
office
and
the
subnet
of
its
Intranet
is
10.0.75.0/24.
The
security
gateway
for
Network
‐
B
has
the
IP
address
of
10.0.75.2
for
LAN
interface
and
118.18.81.33
for
WAN
interface.
It
serves
as
a
GRE
client.
The
GRE
client
in
the
Security
Gateway
2
establishes
a
GRE
VPN
tunnel
with
the
GRE
server
in
the
Security
Gateway
1.
So
both
Intranets
of
10.0.75.0/24
and
10.0.76.0/24
can
communicate
each
other.
Finally,
the
client
hosts
in
the
Intranet
of
Network
‐
B
at
branch
office
can
access
the
server
or
database
resources
in
the
Intranet
of
Network
‐
A
at
HQ
in
a
tunnel.
However,
if
the
"Default
Gateway/Remote
Subnet"
parameter
in
the
Security
Gateway
2
is
configured
to
"Default
Gateway",
the
Internet
accessing
of
GRE
Client
peer
also
go
through
the
established
GRE
VPN
tunnel,
and
the
Security
Gateway
1
can
control
the
accessing
as
same
as
the
HQ
resource
accessing.
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