Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
233
The
Client
may
be
a
mobile
user
or
mobile
site,
and
requesting
the
PPTP
tunnel
connection
with
its
account
/
password.
PPTP
protocol
is
used
for
establishing
a
PPTP
VPN
tunnel.
The
PPTP
Client’s
“Default
Gateway/Remote
Subnet”
setting
determines
how
the
Internet
traffic
from
PPTP
client
site
is
handled.
Parameter
Setup
Example
For
Network
‐
B
at
Mobile
Office
Following
3
tables
list
the
parameter
configuration
for
above
example
diagram
of
PPTP
VPN
client
in
Network
‐
B.
Use
default
value
for
those
parameters
that
are
not
mentioned
in
these
tables.
Configuration
Path
[PPTP]
‐
[Configuration]
PPTP
■
Enable
Client/Server
Client
Configuration
Path
[PPTP]
‐
[PPTP
Client
Configuration]
PPTP
Client
■
Enable
Configuration
Path
[PPTP]
‐
[
Configuration
for
A
PPTP
Client]
PPTP
Client
Name
PPTP
#1
Interface
WAN
1
Remote
IP/FQDN
203.95.80.22
User
Name
User
‐
1
Password
1234
Default
Gateway/Remote
Subnet
Default
Gateway
Authentication
Protocol
MS
‐
CHAP
MPPE
Encryption
■
Enable
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
PPTP
server.
However,
Network
‐
B
is
in
the
mobile
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
PPTP
client.
The
PPTP
client
uses
"User
‐
1"
user
account
to
dial
in
the
PPTP
server
at
HQ
for
establishing
a
PPTP
VPN
tunnel.
So
both
Intranets
of
10.0.75.0/24
and
10.0.76.0/24
can
securely
communicate
each
other.
Finally,
the
client
hosts
in
the
Intranet
of
Network
‐
B
at
mobile
office
can
access
the
server
or
database
resources
in
the
Intranet
of
Network
‐
A
at
HQ
in
a
secured
link.
However,
if
the
"Default
Gateway/Remote
Subnet"
parameter
in
the
Security
Gateway
2
is
configured
to
"Default
Gateway",
the
Internet
accessing
of
PPTP
Client
peer
also
go
through
the
