Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
221
Tunnel
Scenario.
It
is
not
available
for
Dynamic
VPN
tunneling
application.
Operation
Mode
1.
A
Must
fill
setting
2.
Alway
on
is
selected
by
default
There
are
three
available
operation
modes.
Always
On,
Failover,
Load
Balance.
Failover/
Always
Define
whether
the
IPSec
tunnel
is
a
failover
tunnel
function
or
an
Always
on
tunnel.
Note:
If
this
IPSec
is
a
failover
tunneling,
you
will
need
to
select
a
primary
IPSec
tunnel
from
which
to
failover
to.
Load
Balance
Define
whether
the
IPSec
tunnel
connection
will
take
part
in
load
balance
function
of
the
gateway.
You
will
not
need
to
select
with
WAN
interface
as
the
system
will
automatically
utilize
the
available
WAN
interfaces
to
balance
traffic
loads.
For
more
details
on
WAN
Load
Balance,
refer
to
Load
Balance
Usage
in
this
manual.
On
gateway’s
web
‐
based
utility,
go
to
Basic
Network
>
WAN
>
Load
Balance
tab.
Note:
Failover
and
Load
Balance
functions
are
not
available
for
Dynamic
VPN
specified
in
Tunnel
Scenario.
Encapsulation
Protocol
1.
A
Must
fill
setting
2.
ESP
is
selected
by
default
Select
the
Encapsulation
Protocol
from
the
dropdown
box
for
this
IPSec
tunnel.
Available
encapsulations
are
ESP
and
AH.
Keep
alive
1.
Unchecked
by
default
2.
30s
is
set
by
default
Check
the
Enable
box
to
enable
Keep
alive
function.
Select
Ping
IP
to
keep
live
and
enter
the
IP
address
to
ping.
Enter
the
ping
time
interval
in
seconds.
Note:
Keep
alive
option
is
not
available
for
Dynamic
VPN
specified
in
Tunnel
Scenario.
Local
&
Remote
Configuration
Window
Item
Value setting
Description
Local
Subnet
List
A
Must
fill
setting
Specify
the
Local
Subnet
IP
address
and
Subnet
Mask.
Click
the
Add
or
Delete
button
to
add
or
delete
a
Local
Subnet.
Note_1:
When
Dynamic
VPN
option
in
Tunnel
Scenario
is
selected,
there
will
be
only
one
subnet
available.
Note_2:
When
Host
‐
to
‐
Site
or
Host
‐
to
‐
Host
option
in
Tunnel
Scenario
is
selected,
Local
Subnet
will
not
be
available.
Note_3:
When
Hub
and
Spoke
option
in
Hub
and
Spoke
is
selected,
there
will
be
only
one
subnet
available.
Full
Tunnel
Unchecked
by
default
Click
Enable
box
to
enable
Full
Tunnel.
Note:
Full
tunnel
is
available
only
for
Site
‐
to
‐
Site
specified
in
Tunnel
Scenario.
Remote
Subnet
List
A
Must
fill
setting
Specify
the
Remote
Subnet
IP
address
and
Subnet
Mask.
Click
the
Add
or
Delete
button
to
add
or
delete
Remote
Subnet
setting.
Remote
Gateway
1.
A
Must
fill
setting.
2.
Format
can
be
a
ipv4
address
or
FQDN
Specify
the
Remote
Gateway.
