PoE
AP
Router
246
LAN
interface
and
118.18.81.33
for
WAN
‐
1
interface.
It
serves
as
a
NAT
router.
At
first
stage,
the
NMS
manager
prepares
related
information
for
all
managed
devices
and
records
them
in
the
NMS
system.
Then
NMS
system
gets
the
status
of
all
managed
devices
by
using
SNMP
get
commands.
When
the
manager
wants
to
configure
the
managed
devices,
the
NMS
system
allows
him
to
do
that
by
using
SNMP
set
commands.
The
"UserName1"
account
is
used
if
the
manager
uses
SNMPv3
protocol
for
configuring
the
"Gateway
1".
Only
the
"UserName1"
account
can
let
the
"Gateway
1"
accept
the
configuration
from
the
NMS
since
the
authority
of
the
account
is
"Read/Write".
Once
a
managed
device
has
an
urgent
event
to
send,
the
device
will
issue
a
trap
to
the
Trap
Event
Receivers.
The
NMS
itself
could
be
one
among
them.
If
you
want
to
secure
the
transmitted
SNMP
commands
and
responses
between
the
NMS
and
the
managed
devices,
use
SNMPv3
version
of
protocol.
The
remote
NMS
without
privilege
IP
address
can't
manage
the
"Gateway
1",
since
"Gateway
1"
allows
only
the
NMS
with
privilege
IP
address
can
manage
it
via
its
WAN
interface.
