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Billion 400G
Router
Chapter 4: Configuration
68
Sometime
your
customers
or
friends
may
upload
their
files
to
your
FTP
server
and
that
will
saturate
your
downstream
bandwidth.
The
settings
below
will
help
you
to
limit
bandwidth
for
such
an
application
that needs
restriction.
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Billion 400G
Router
Chapter 4: Configuration
69
Virtual Server (known as Port Forwarding)
In
TCP/IP
and
UDP
networks,
a
port
is
a
16-bit
number
used
to
identify
which
application
program incoming
connections
should
be
delivered
to.
Some
ports
have
numbers
that
are
pre-assigned
to
them
by the
IANA
(the
Internet
Assigned
Numbers
Authority),
and
these
are
referred
to
as
“well-known
ports”. Servers
follow
the
well-known
port
assignments
so
clients
can
locate
them.
If
you
wish
to
run
a
server,
or
any
application
(e.g.
Peer-to-peer/P2P
software
such
as
instant
messaging
applications
and
P2P
file-sharing
applications)
on
your
network
that
can
be
accessed
from
the
WAN
(i.e. from
machines
on
the
Internet
that
are
outside
your
local
network,
and
you
are
using
NAT
(Network Address
Translation),
then
you
will
need
to
configure
your
router
to
forward
these
incoming
connection attempts
using
specific
ports
to
the
computer
on
your
network
that
is
running
the
application/server.
You will
also
need
to
use
port
forwarding
if
you
want
to
host
an
online
game
server.
The
reason
for
this
is
that
when
using
NAT,
your
publicly
accessible
IP
address
will
be
used
by
and
point to
your
router,
which
then
needs
to
deliver
all
traffic
to
the
private
IP
addresses
used
by
your
PCs.
Please see
the
WAN
configuration
section
of
this
manual
for
more
information
on
NAT.
The
device
can
be
configured
as
a
virtual
server
so
that
remote
users
accessing
services
such
as
Web
or FTP
services
on
the
routers
public
(WAN)
IP
address
can
be
automatically
redirected
to
local
servers
on the
LAN
network.
Depending
on
the
requested
service
(TCP/UDP
port
number),
the
router
redirects
the external
service
request
to
the
appropriate
server
within
the
LAN
network
Add Virtual Server
Because
NAT
can
act
as
a
“natural”
Internet
firewall,
your
router
protects
your
network
from
being accessed
by
outside
users
when
NAT
is
enabled – all
incoming
connection
attempts
will
point
to
your router
unless
you
specifically
created
Virtual
Server
entries
to
forward
those
ports
to
a
computer
on
your network.
When
your
router
needs
to
allow
outside
users
to
access
internal
servers,
e.g.
a
web
server,
FTP
server, Email
server
or
game
server,
the
router
can
act
as
a
“virtual
server”.
You
can
set
up
a
local
server
with
a specific
port
number
for
the
service
to
use
e.g.
web/HTTP
(port
80),
FTP
(port
21),
Telnet
(port
23), SMTP
(port
25),
or
POP3
(port
110),
When
an
incoming
access
request
for
a
specified
port
is
received
by the
router,
it
will
be
forwarded
to
the
corresponding
internal
server.
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Billion 400G
Router
Chapter 4: Configuration
70
Application
:
A
user-defined
description
used
to
identify
this
entry.
You
can
click
drop-down menu
to
select existing
predefined
rules.
:
20 predefined rules are available.
Application, Protocol and External/Redirect Ports will be filled after
the selection has been made.
Protocol
:
This
is
the
protocol
supported
by
the
virtual
server.
In
addition
to
specifying
the
port
number
to be
used,
you
will
also
need
to
specify
the
protocol
used.
The
protocol
used
is
determined
by
the
particular application.
Most
applications
will
use
TCP
or
UDP.
Time Schedule:
The
user-defined
time
period
to
enable
your
virtual
server.
You
may
specify
a
time schedule
or
Always
on
for
the
use
of
this
Virtual
Server
Entry. For
setup
and
detail,
refer
to
the
Time Schedule
section.
External Port:
The Port number on the Remote/WAN side used when accessing the virtual server.
Redirect Port:
The Port number used by the Local server in the LAN network.
Internal IP Address:
The private IP in the LAN network, which will be providing the virtual server application.
List
all
existing
computers
currently
connected
to
the
network.
You
may
assign
a computer
with
an
IP
address
or
a
MAC
address
from
this
list.
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Billion 400G
Router
Chapter 4: Configuration
71
Example:
If
you
would
like
to
remotely
access
your
routers’
Web/HTTP
interface
all
the
time,
you
would
need
to enable
port
number
80
(Web/HTTP)
and
map
it
to
the
Router’s
LAN
IP
Address.
All
incoming
HTTP requests
on
the
WAN
network
will
then
be
forwarded
to
the
router’s
IP
address
of
10.0.0.2.
Since port
number
80
is
already
a
predefined
rule,
click
Helper
in
the
Application
section
.
A
predefined rules
window
will
pop
and
you
can
select
HTTP_Sever
.
Application:
HTTP_Sever
Time Schedule:
Always On
Protocol:
tcp
External Port:
80-80
Redirect Port:
80-80
IP Address:
10.0.0.2
Add: Click it to apply your settings.
Edit/Delete:
Click it to edit or delete this virtual server application.
I
f
you
have
disabled
the
NAT
option
in
the
WAN-ISP
section,
the
Virtual
Server
function
will
not
work
.
I
f
the
DHCP
server
option
is
enabled,
you
have
to
be
very
careful
when assigning
the
IP
addresses
of
virtual
servers
so
that
you
avoid
conflicting
IP addresses.
The
easiest
method
of
configuring
Virtual
Servers
is
to
manually assign
static
IP
address
to
each
virtual
server
Computer,
with
an
address
that does
not
fall
into
the
range
of
IP
addresses
that
are
to
be
issued
by
the
DHCP server.
These
manually
configured
IP
addresses
MUST
still
be
in
the
same subnet
as
the
route
r.
Attention
Using
port
forwarding
has
security
implications,
since
outside
users
will
be
able to
connect
to
Computers
on
your
network.
For
this
reason
you
are
advised
to add
specific
Virtual
Server
entries
only
for
the
ports
that
your
application actually
requires,
instead
of
using
the
DMZ
function.
Using
the
DMZ
f
unction will
result
in
all
connection
attempts
from
the
WAN
network
having
access
to the
public
IP
specified
in
the
DMZ
config
section
.
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