Filter
Top Products
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.