Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
208
Configuration
The
"Configuration"
window
is
to
enable
the
IPSec
VPN
function.
In
addition,
if
you
want
to
activate
the
network
neighborhood
communication
to
work
between
both
Intranets
of
local
and
remote
peers
in
the
IPSec
VPN
tunnel,
you
can
check
the
"NetBIOS
over
IPSec"
box.
Moreover,
if
your
security
gateway
is
under
a
NAT
router
and
you
want
to
create
an
IPSec
VPN
tunnel
between
your
security
gateway
and
remote
security
gateway.
Your
gateway
must
act
as
the
initiator
for
the
IPSec
tunnel
and
the
NAT
router
must
pass
through
the
IPSec
packets
from
your
security
gateway
to
remote
one.
Check
the
"NAT
Traversal"
box
to
setup
the
scenario
of
IPSec
tunnel
through
NAT
router.
At
last,
the
"Configuration"
window
shows
the
maximum
number
of
concurrent
IPSec
VPN
tunnels
that
are
running
in
system.
Tunnel
List
&
Status
The
Tunnel
List
shows
the
setup
parameters
of
all
IPSec
VPN
tunnels
and
their
connection
status,
including
the
interface
name
for
the
tunnel
endpoint,
the
tunnel
name,
the
subnet
of
remote
Intranet,
the
IP
address
of
remote
gateway,
its
connection
status
and
the
tunnel
enable
checkbox.
There
is
one
"Add"
button
at
the
"Tunnel
List
&
Status"
caption
can
let
you
add
and
create
one
new
IPSec
VPN
tunnel.
Tunnel
Configuration
There
are
some
parameters
to
setup
the
tunnel,
like
"Tunnel
Configuration",
"Local
&
Remote
Configuration",
"Authentication",
"IKE
Phase",
"IKE
Proposal
Definition",
"IPSec
Phase"
and
"IPSec
Proposal
Definition"
configuration
windows.
Before
going
to
setup
the
VPN
connections,
you
may
need
to
decide
the
scenario
type
for
the
tunneling.
The
scenario
can
be
"Site
to
Site",
"Site
to
Host",
"Host
to
Site",
"Host
to
Host",
or
"Dynamic
VPN".
There
are
three
commonly
used
IPSec
VPN
connection
scenarios
as
follows.
