M2M
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
159
3.d
Client
&
Server
&
Proxy
This
section
presents
application
clients,
servers
or
proxies
running
in
the
gateway
system.
There
are
mainly
Dynamic
DNS
client
and
DHCP
server
in
the
current
gateway
device.
3.d.1
DNS
&
DDNS
How
does
user
access
your
server
if
your
WAN
IP
address
changes
all
the
time?
One
way
is
to
register
a
new
domain
name,
and
maintain
your
own
DNS
server.
Another
simpler
way
is
to
apply
a
domain
name
to
a
third
‐
party
DDNS
service
provider.
The
service
can
be
free
or
charged.
If
you
want
to
understand
the
basic
concepts
of
DNS
and
Dynamic
DNS,
you
can
refer
to
Wikipedia
website
10,11
.
To
host
your
server
on
a
changing
IP
address,
you
have
to
use
dynamic
domain
name
service
(DDNS).
Therefore,
anyone
wishing
to
reach
your
host
only
needs
to
know
the
domain
name.
Dynamic
DNS
will
map
the
name
of
your
host
to
your
current
IP
address,
which
changes
each
time
you
connect
your
Internet
service
provider.
In
short,
the
Dynamic
DNS
service
allows
the
gateway
to
alias
a
public
dynamic
IP
address
to
a
static
domain
name,
allowing
the
gateway
to
be
more
easily
accessed
from
various
locations
on
the
Internet.
The
user
has
to
register
a
domain
name
to
a
third
‐
party
DDNS
service
provider
to
use
DDNS
function.
In
the
"Dynamic
DNS"
page,
there
is
only
one
configuration
window
to
set
up
the
necessary
parameters
for
Dynamic
DNS
function.
Dynamic
DNS
The
required
parameters
for
the
dynamic
DNS
agent
in
the
gateway
system
include
the
DDNS
10 http://en.wikipedia.org/wiki/Domain_Name_System
11 http://en.wikipedia.org/wiki/Dynamic_DNS
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