Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
106
and
sends
the
replies
from
LAN
servers
to
the
requester.
The
E
‐
server
at
LAN
side
is
the
server
for
E
‐
service.
Parameter
Setup
Example
Following
table
list
the
parameter
configuration
as
an
example
for
scenario
②
in
above
diagram.
Please
be
noted
that
the
E
‐
service
includes
SMTP
and
POP3
service
ports.
Use
default
value
for
those
parameters
that
are
not
mentioned
in
the
table.
Configuration
Path
[Virtual
Server
&
Virtual
Computer]
‐
[Virtual
Server
List]
ID
1
2
Public
Port
25
(SMTP)
110
(POP3)
Server
IP
10.0.75.101
10.0.75.101
Private
Port
25
(SMTP)
110
(POP3)
Rule
■
Enable
■
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
118.18.81.33
for
WAN
interface.
It
serves
as
a
NAT
router.
Define
the
E
‐
virtual
server
to
be
located
at
a
server
with
IP
address
10.0.75.101
in
the
Intranet
of
Network
‐
A,
including
SMTP
service
port
25
and
POP3
service
port
110.
So,
the
remote
user
can
access
the
E
‐
server
in
the
gateway
that
has
the
global
IP
118.18.81.33
at
its
WAN
side.
But
the
real
E
‐
server
is
located
at
LAN
side
and
the
gateway
is
the
port
forwarder
for
E
‐
service.
A
virtual
server
rule
can
be
integrated
with
a
schedule
rule.
That
means,
the
virtual
server
rule
can
be
activated
only
at
the
pre
‐
defined
time
schedule.
Virtual
Computer
List
"Virtual
Computer"
feature
allows
you
to
assign
LAN
hosts
to
global
IP
addresses,
so
that
they
can
be
visible
to
outside
world.
While
so,
they
are
also
protected
by
the
gateway
firewall
as
same
as
they
are
protected
when
being
client
hosts
in
the
Intranet.
For
example,
if
you
set
an
FTP
file
server
at
LAN
side
with
local
IP
address
10.0.75.102
and
global
IP
address
118.18.82.44,
a
remote
user
can
access
the
file
server
while
it
is
hidden
behind
the
NAT
gateway.
That
is
because
the
gateway
takes
care
of
all
accessing
to
the
IP
address
118.18.82.44,
including
to
forward
the
access
requests
to
the
file
server
and
to
send
the
replies
from
the
server
to
outside
world,
as
shown
in
scenario
of
following
diagram
.
