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User's Manual

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Table Of Contents
43
6.0 Firewall
T
h
e
firewall is the
foundation
of the
TG590 ’s
security s
u
i
t
e, and it
has been tailor-made to meet the need of
the residential/office network user and is
configured
to give the best p
r
o
t
e
c
t
ion and flexibility to users using
interactive applications, such as Internet gaming and video conferencing.
T
h
e
firewall controls the flow of data between the local network and
t
h
e
I
n
t
e
r
n
e
t
.
B
o
t
h
incoming and
outgoing data are inspected and then
e
i
t
h
e
r
accepted (allowed
)
or rejected (barred)
f
r
o
m
passing through
the
TG590
according
to a set
o
f
r
u
l
e
s
.
T
h
e
rules are calculated to stop
unwanted
intrusions from the
ou
t
s
i
d
e
,
while allowing local network users access to required
I
n
t
e
r
n
e
t
s
e
r
v
i
c
e
s
.
T
h
e
TG590
features three pre-defined firewall security
l
e
v
e
l
s
:
M
aximum
,
T
ypic
al
,
and
M
inimum
.
T
h
e
table
below summarizes the behavior of the TG590 for each of the three security
l
e
v
e
l
s
.
Security
L
e
vel
I
n
t
e
r
n
e
t
r
eq
u
e
s
t
s
(incoming
t
r
a
ff
i
c
)
L
o
c
a
l
network
r
eq
u
e
s
t
s
(
o
u
t
g
o
i
ng
t
r
a
ff
i
c
)
Maximum
S
ecurit
y
Blocked - No access
t
o
local network
f
r
o
m
I
n
t
e
r
n
e
t
,
except
a
s configured
in the
P
o
r
t
F
o
r
w
a
r
d
i
ng
,
DMZ
h
o
s
t
,
a
nd
R
e
m
o
t
e
Access sc
r
ee
n
s
.
Limited -
Only
c
o
mm
o
n
l
y
used
s
e
r
v
i
c
e
s
,
such
a
s
web browsing and
e
ma
il
,
are
pe
r
m
i
tt
e
d
.
Typical
S
ecurit
y
Blocked - No access
t
o
local network
f
r
o
m
I
n
t
e
r
n
e
t
,
except
a
s configured
in the
P
o
r
t
F
o
r
w
a
r
d
i
ng
,
DMZ
h
o
s
t
,
a
nd
R
e
m
o
t
e
Access sc
r
ee
n
s
.
Unrestricted
-
All
s
e
r
v
i
c
e
s are
pe
r
m
i
tt
e
d
,
except
a
s
configured in the Access
Control sc
r
ee
n
.
M
inimum
S
ecurit
y
Unrestricted
-
P
e
r
m
i
t
s full access
from
I
n
t
e
r
n
e
t
to local
n
e
t
w
o
r
k
;
all
connection
a
tt
e
m
p
t
s
pe
r
m
i
tt
e
d
.
Unrestricted
-
All
s
e
r
v
i
c
e
s are
pe
r
m
i
tt
e
d
,
except
a
s
configured in the Access
Control sc
r
ee
n
.
T
h
e
s
e
services include
T
e
l
n
e
t
,
F
T
P
,
HTTP, HTTPS,
D
N
S
,
I
M
A
P
,
POP3 and
S
M
T
P
.