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Billion 800VGT Router
Firewall
and
Access
Control
Your
router
includes
a
full
SPI
(Stateful
Packet
Inspection)
firewall
for
controlling
Internet
access
from
your
LAN,
as
well
as
helping
to
prevent
attacks
from
hackers.
In
addition
to
this,
when
using
NAT,
the
router
acts
as
a
“natural”
Internet
firewall,
as
all
PCs
on
your
LAN
will
use
private
IP
addresses
that
cannot
be
directly
accessed
from
the
Internet.
Firewall
:
Prevents
access
from
outside
your
network.
The
router
provides
three
levels
of
security
support:
NAT
natural
firewall
:
This
masks
LAN
users’
IP
addresses
making
them
invisible
to
outside
users
on
the
Internet,
thus
making
it
much
more
difficult
for
a
hacker
to
target
any
machine
on
your
network.
This
natural
firewall
is
on
when
NAT
function
is
enabled.
When
using
the
Virtual
Servers
function,
your
PCs
will
be
exposed
to
the
degree
specified
in
your
Virtual
Server
settings,
provided
that
the
ports
specified
are
opened
in
your
firewall
packet
filter
settings.
Firewall
Security
and
Policy
(General
Settings)
:
Inbound
direction
of
Packet
Filter
rules
to
prevent
unauthorized
WAN
computers
or
applications
accessing
your
local
network
from
the
Internet.
Intrusion
Detection
:
Enable
Intrusion
Detection
to
detect,
prevent
and
log
malicious
attacks.
Access
Control
:
Prevents
access
from
computers
on
your
local
network:
Firewall
Security
and
Policy
(General
Settings)
:
Outbound
direction
of
Packet
Filter
rules
to
prevent
unauthorized
LAN
computers
or
applications
accessing
the
Internet.
URL
Filter
:
Blocks
computers
on
your
local
network
from
unwanted
websites.
Here
are
the
items
within
the
Firewall
section:
General
Settings,
Packet
Filter,
Intrusion
Detection,
URL
Filter,
IM/P2P
Blocking
and
Firewall
Log.
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Configuration
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Billion 800VGT Router
General
Settings
You
can
choose
not
to
enable
the
Firewall
and
still
have
access
to
URL
Filter
and
IM/P2P
Blocking,
or
you
can
enable
the
Firewall
using
preset
filter
rules
and
modify
the
port
filter
rules
as
required.
The
Packet
Filter
is
used
to
filter
packets
based-on
Applications
(Port)
or
IP
addresses.
There
are
four
options
when
you
enable
the
Firewall,
they
are:
²
All
blocked/User-defined
:
No
pre-defined
port
or
address
filter
rules
by
default,
meaning
that all
inbound
(Internet
to
LAN)
and
outbound
(LAN
to
Internet)
packets
will
be
blocked.
Users
have
to add
their
own
filter
rules
for
further
access
to
the
Internet.
²
High/Medium/Low
security
level:
The
predefined
port
filter
rules
for
High,
Medium
and
Low
security
are
displayed
in
Port
Filters
of
Packet
Filter.
Select
either
High,
Medium
or
Low
security
level
to
enable
the
Firewall.
The
only
difference
between
these
three
security
levels
is
the
preset
port
filter
rules
in
the
Packet
Filter.
Firewall
functionality
is
the
same
for
all
levels;
it
is
only
the
list
of
preset
port
filters
that
changes
between
each
setting.
For
more
detailed
on
level
of
preset
port
filter
information,
refer
to
Table
1:
Predefined
Port
Filter
.
If
you
choose
one
of
the
preset
security
levels
and
add
custom
filters,
this
level
of
filter
rules
will
be
saved
and
you
do
not
need
to
re-configure
the
rules
again
if
you
disable
or
switch
to
other
firewall
level.
The
“
Block
WAN
Request
”
is
a
stand-alone
function
and
not
related
to
whether
security
is
enabled
or
disabled.
Mostly
this
is
used
to
preventing
a
hacker
on
the
WAN
from
using
any
scan
tools..
Attempting
to
perform
this
action
remotely
may
result
in
blocking
of
all
access
to
configuration
and
management
of
the
device
from
the
Internet.
Use
this
with
caution
when
connecting
over
the
WAN
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Configuration
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Billion 800VGT Router
Packet
Filter
This
function
is
only
available
when
the
firewall
function
is
enabled
and
one
of
these
four
security
levels
is
chosen
(All
blocked,
High,
Medium
and
Low).
The
preset
port
filter
rules
in
the
Packet
Filter
must
be
modified
according
to
the
level
of
Firewall
which
is
selected.
See
Table1:
Predefined
Port
Filter
for
more
detail
information.
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Configuration
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Billion 800VGT Router
Example:
Predefined Port Filters Rules
The
predefined
port
filter
rules
for
High,
Medium
and
Low
security
levels
are
listed.
See
Table
1.
Note:
Firewall
–
For
Blocked/User-defined
,
you
must
define
and
create
the
port
filter
rules
yourself.
No
predefined
rules
are
configured
for
these
modes.
Table 1: Predefined Port Filter
Port
Number
Firewall
-
Low
Firewall
-
Medium
Firewall
–
High
Application
Protocol
Start
End
Inbound
Outbound
Inbound
Outbound
Inbound
Outbound
HTTP(80)
TCP(6)
80
80
NO
YES
NO
YES
NO
YES
DNS
(53)
UDP(17)
53
53
NO
YES
NO
YES
NO
YES
DNS
(53)
TCP(6)
53
53
NO
YES
NO
YES
NO
YES
FTP(21)
TCP(6)
21
21
NO
YES
NO
YES
NO
NO
Telnet(23)
TCP(6)
23
23
NO
YES
NO
YES
NO
NO
SMTP(25)
TCP(6)
25
25
NO
YES
NO
YES
NO
YES
POP3(110)
TCP(6)
110
110
NO
YES
NO
YES
NO
YES
NEWS(NNTP)
(Network
News
Transfer Protocol)
TCP(6)
119
119
NO
YES
NO
YES
NO
NO
RealAudio/
RealVideo
(7070)
UDP(17)
7070
7070
YES
YES
YES
YES
NO
NO
PING
ICMP(1)
N/A
N/A
NO
YES
NO
YES
NO
YES
H.323(1720)
TCP(6)
1720
1720
YES
YES
NO
YES
NO
NO
T.120(1503)
TCP(6)
1503
1503
YES
YES
NO
YES
NO
NO
SSH(22)
TCP(6)
22
22
NO
YES
NO
YES
NO
NO
NTP
/SNTP
UDP(17)
123
123
NO
YES
NO
YES
NO
YES
HTTP/HTTP
Proxy
(8080)
TCP(6)
8080
8080
NO
YES
NO
NO
NO
NO
HTTPS(443)
TCP(6)
443
443
NO
YES
NO
YES
N/A
N/A
ICQ
(5190)
TCP(6)
5190
5190
YES
YES
N/A
N/A
N/A
N/A
MSN
(1863)
TCP(6)
1863
1863
YES
YES
N/A
N/A
N/A
N/A
MSN
(7001)
UDP(17)
7001
7001
YES
YES
N/A
N/A
N/A
N/A
MSN
VIDEO
(9000)
TCP(6)
9000
9000
NO
YES
N/A
N/A
N/A
N/A
Inbound:
Internet
to
LAN
;
Outbound:
LAN
to
Internet.
YES:
Allowed
;
NO:
Blocked
;
N/A:
Not
Applicable
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Configuration
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Billion 800VGT Router
Packet
Filter
–
Add
TCP/UDP
Filter
Rule
Name:
Specify
a
User-defined
description
identifying
this
entry
or
click
to
select
existing
predefined
rules.
The
maximum
name
length
is
32
characters.
Time
Schedule:
T
his
is
the
user-defined
time
period
applicable
to
the
rule.
You
may
specify
a
time
schedule
for
your
prioritization
policy.
For
setup
and
detail,
refer
to
Time
Schedule
section
Source
IP
Address(es)
/
Destination
IP
Address(es):
This
is
the
Address-Filter
used
to
allow
or
block
traffic
to/from
particular
IP
address(es).
Selecting
the
Subnet
Mask
of
the
IP
address
range
you
wish
to
allow/block
the
traffic
to
or
form;
set
IP
address
and
Subnet
Mask
to
0.0.0.0
to
inactive
the
Address-Filter
rule,
(such
as
when
you
are
setting
up
a
port
filter
rule
that
is
applicable
to
all
hosts)
Tip:
To
block
access,
to/from
a
single
IP
address,
enter
that
IP
address
as
the
Host
IP
Address
and
use
a
Host
Subnet
Mask
of
“255.255.255.255”.
Type:
It
is
the
packet
protocol
type
used
by
the
application,
select
TCP
,
UDP
or
both
TCP/UDP
.
Source
Port:
This
Port
or
Port
Range
defines
the
port
allowed
to
be
used
by
the
Remote/WAN
to
connect
to
the
application.
The
default
is
0
~
65535.
It
is
recommended
that
this
option
only
be
configured
by
advanced
users.
Destination
Port:
This
is
the
Port
(or
Port
Range)
that
is
defined
by
the
application.
Inbound
/
Outbound:
Select
Allow
or
Block
to
control
access
to
the
Internet
(
“Outbound”
)
or
from
the
Internet
(
“Inbound”
).
Click
the
Apply
button
to
apply
your
changes.
60
Chapter
4:
Configuration
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