User's Manual

Chapter 4
Advanced Configuration
15
Wireless-N ADSL2+ Gateway
into multiple packets. I
f
you experience a high packet
error rate, you may s
l
ig
h
t
l
y increase t
h
e Fragmentation
T
h
res
h
o
ld
. Setting t
h
e Fragmentation T
h
res
h
o
ld
too
l
ow
may result in poor network per
f
ormance. Only minor
reduction o
f
the de
f
ault value is recommended. In most
cases, it should remain at its de
f
ault value o
f
23
4
6
.
RTS T
h
res
h
o
ld
S
h
ou
ld
you encounter inconsistent
data
f
low, only minor reduction o
f
the de
f
ault,
23
4
6
,
i
s
recommended. I
f
a network packet is smaller than the
preset RTS t
h
res
h
o
ld
size, t
h
e RTS/CTS mec
h
anism wi
ll
not
b
e ena
bl
e
d
. T
h
e Gateway sen
d
s Request to Sen
d
(RTS)
f
rames to a particular receiving station and negotiates
the sending o
f
a data
f
rame. A
f
ter receiving an RTS, the
wireless station responds with a Clear to Send (CTS)
f
rame
to ac
k
now
l
e
d
ge t
h
e rig
h
t to
b
egin transmission. T
h
e RTS
Threshold value should remain at its de
f
ault value o
f
23
4
6
.
C
l
ic
k
S
ave
S
et
t
i
ngs
to app
l
y your c
h
anges, or c
l
ic
k
Cance
l
C
h
anges to cance
l
your c
h
anges
.
Security > Firewa
ll
T
h
e Firewa
ll
screen is used to configure a firewall that
l
can
f
ilter out various types o
f
unwanted tra
ff
ic on the
Gateway’s
l
oca
l
networ
k
.
Security > Firewa
ll
Firewa
ll
SPI Firewall Protecti
on
To use
f
irewall protection,
keep the de
f
ault selection, Ena
ble
. To turn o
ff
f
irewall
protection, se
l
ect
D
i
sa
ble
.
Fi
l
ter
s
Fi
l
ter Prox
y
Use o
f
WAN proxy servers may compromise
t
h
e Gateway’s security. Denying Proxy wi
ll
d
isa
bl
e access
to any WAN proxy servers. Se
l
ect
F
i
l
ter Prox
y
to ena
bl
e
proxy
f
iltering. Deselect the
f
eature to allow proxy acces
s
.
F
i
l
ter Java App
l
et
s
Java is a programming language
f
or
websites. I
f
you deny Java, you run the risk o
f
not having
access to Internet sites create
d
using t
h
is programming
l
anguage. Se
l
ect
F
i
l
ter Java App
l
ets to ena
bl
e Java
f
iltering. Deselect the
f
eature to allow Java usage
.
F
i
l
ter Coo
k
i
es
A coo
k
ie is
d
ata store
d
on your computer
an
d
use
d
b
y Internet sites w
h
en you interact wit
h
t
h
em.
Se
l
ect
F
i
l
ter Coo
k
i
es
to
f
ilter cookies. Deselect the
f
eature
to a
ll
ow coo
k
ie usag
e
.
F
i
l
ter Ac
t
i
ve
X
ActiveX is a programming language
f
or
websites. I
f
you deny ActiveX, you run the risk o
f
not having
access to Internet sites create
d
using t
h
is programming
l
anguage. Se
l
ect
F
i
l
ter Ac
t
i
ve
X
to enable ActiveX
f
iltering.
Deselect the
f
eature to allow ActiveX usage
.
B
l
oc
k
WAN Request
s
B
l
oc
k
Anonymous Internet Requests This
f
eature
makes it more di
ff
icult
f
or outside users to work their way
into your network. This
f
eature is selecte
d
by de
f
ault.
Deselect the
f
eature to allow anonymous Internet requests
.
C
l
ic
k
S
ave
S
et
t
i
ngs
to app
l
y your c
h
anges, or c
l
ic
k
Cance
l
C
h
anges to cance
l
your c
h
anges
.
Security > VPN Passt
h
roug
h
T
h
e V
PN
Passt
h
roug
h
screen a
ll
ows you to ena
bl
e VPN
tunne
l
s using IPSec, PPTP, or L2TP protoco
l
s to pass t
h
roug
h
the Gateway’s
f
irewall
.
Security > VPN Passt
h
roug
h
VPN Passt
h
roug
h
IPSec Passt
h
roug
h
Internet Protoco
l
Security (IPSec) is
a suite o
f
protocols used to implement secure exchange
o
f
packets at the IP layer. To allow IPSec tunnels to pass
through the Gateway, keep the de
f
ault, Ena
ble
.
PPTP Passt
h
roug
h
Point-to-Point Tunne
l
ing Protoco
l
(PPTP) a
ll
ows t
h
e Point-to-Point Protoco
l
(PPP) to
b
e
tunne
l
e
d
t
h
roug
h
an IP networ
k
. To a
ll
ow PPTP tunne
l
s to
pass through the Gateway, keep the de
f
ault, Ena
bl
e
.
L2TP Passt
h
roug
h
Layer 2 Tunne
l
ing Protoco
l
is t
h
e
met
h
o
d
use
d
to ena
bl
e Point-to-Point sessions via t
h
e
Internet on t
h
e Layer 2
l
eve
l
. To a
ll
ow L2TP tunne
l
s to pass
through the Gateway, keep the de
f
ault, Ena
ble
.
C
l
ic
k
S
ave
S
et
t
i
ngs
to app
l
y your c
h
anges, or c
l
ic
k
Cance
l
C
h
anges to cance
l
your c
h
anges
.