Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
212
Dynamic
VPN
Tunnel
Scenario
Business
Security
Gateway
can
ignore
IP
information
of
clients
when
using
Dynamic
VPN,
so
it
is
suitable
for
users
to
build
VPN
tunnels
with
Business
Security
Gateway
from
a
remote
mobile
site.
Remote
peer
is
a
site
will
be
indicated
in
the
negotiation
packets,
including
what
remote
subnet
is.
It
must
be
noted
that
the
remote
peer
has
to
initiate
the
tunnel
establishing
process
first
in
this
application
scenario.
Scenario
Application
Timing
If
the
security
gateway
in
headquarters
wants
to
allow
any
traveling
employees
to
securely
access
the
enterprise
operation
systems
to
access
office
resources
from
outside,
the
Dynamic
VPN
connection
can
be
setup
up
to
meet
the
requirement.
These
mobile
employees
are
carrying
with
their
notebooks
or
security
supporting
gateways
outsides,
and
use
these
devices
to
connect
to
the
Internet
and
try
to
access
the
enterprise
resources
at
headquarters.
But
the
IP
address
that
the
devices
get
is
dynamic,
not
fixed.
When
the
security
gateway
of
headquarters
need
to
check
the
IP
address
of
a
remote
device
during
establishing
a
secure
VPN
tunnel
for
data
communication,
mobile
devices
will
fail
since
they
have
not
fixed
IP
address.
So,
to
activate
the
"Dynamic
VPN"
function
on
the
headquarters
gateway
is
a
fast
approach
for
the
secure
data
communication
between
mobile
devices
and
the
headquarters
gateway.
You
can
follow
the
deployment
steps
as
below.
Scenario
Description
Dynamic
VPN
is
suitable
for
the
Initiator
being
a
mobile
site
or
a
mobile
device
with
a
dynamic
IP,
