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Page 61 / 180 Scroll up to view Page 56 - 60
WRVS4400N User Guide
55
Wireless Tab
Setting Up and Configuring the Router
Advanced Wireless Settings
Configure the advanced settings for the Wireless Router. The Wireless-N Router adopts several
new parameters to adjust the channel bandwidth and guard intervals to improve the data rate
dynamically. Linksys recommends to let your Wireless Router automatically adjust the
parameters for maximum data throughput.
Advanced Wireless
You can change the following advanced parameters (some only for Wireless-N) for this Wireless
Router. Wireless-N data rates are classified into 16
MCS
numbers (0-15).
MCS
stands for
Modulation and Coding Scheme. For the same
MCS
number, the data rate changes according
to the Channel Bandwidth and Guard Interval settings. You can see the change through the
drop-down menu of
Tx Rate Limiting (11n clients)
.
Channel Bandwidth
—Select the channel bandwidth manually for Wireless-N connections.
When it is set to 20MHz, only the 20MHz channel is used. When it is set to 40MHz, Wireless-N
connections will use 40MHz channel but Wireless-B and Wireless-G will still use 20MHz channel.
The default is
Auto
.
Guard Interval
—Select the guard interval manually for Wireless-N connections. The two
options are
Short
(400ns)
and
Long
(800ns)
. The default is
Auto
.
CTS Protection Mode
—CTS (Clear-To-Send) Protection Mode function boosts the Wireless
Router’s ability to catch all wireless transmissions, but will severely decrease performance. Keep
the default setting,
Auto
, so the Wireless Router can use this feature as needed, when the
Wireless-N/G products are not able to transmit to the Wireless Router in an environment with
heavy 802.11b traffic. Select
Disabled
if you want to permanently disable this feature.
Beacon Interval—
Indicates the frequency interval of the beacon. A beacon is a packet
broadcast by the Wireless Router to keep the network synchronized. A beacon includes the
wireless networks service area, the Wireless Router address, the Broadcast destination
addresses, a time stamp, Delivery Traffic Indicator Maps, and the Traffic Indicator Message
(TIM). The default is
100
ms.
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WRVS4400N User Guide
56
Wireless Tab
Setting Up and Configuring the Router
DTIM Interval
—Indicates how often the Wireless Router sends out a Delivery Traffic Indication
Message (DTIM). Lower settings result in more efficient networking, while preventing your PC
from dropping into power-saving sleep mode. Higher settings allow your PC to enter sleep
mode, thus saving power, but interferes with wireless transmissions. The default is
1
ms.
RTS Threshold—
Determines how large a packet can be before the Wireless Router
coordinates transmission and reception to ensure efficient communication. This value should
remain at its default setting of
2346
. If you encounter inconsistent data flow, only minor
modifications are recommended.
Change these settings as described here and click
Save Settings
to apply your changes, or click
Cancel Changes
to cancel your changes. Help information is displayed on the right-hand side
of the screen, and click
More
for additional details.
VLAN & QoS
Configure the Qos and VLAN settings for the Access Point. The QoS (Quality of Service) feature
allows you specify priorities for different traffic. Lower priority traffic will be slowed down to
allow greater throughput or less delay for high priority traffic. The 802.1Q VLAN feature is
allowing traffic from different sources to be segmented. Combined with the multiple SSID
feature, this provides a powerful tool to control access to your LAN.
VLAN
Enabled/Disabled VLAN—
Enable this feature only if the hubs/switches on your LAN support
the VLAN standard.
AP Management VLAN—
Define the VLAN ID used for management.
VLAN ID—
Enter the VLAN ID.
QoS
U-APSD(WMM Power Save)—
Select Enabled or Disabled as required.
WMM—
Wi-Fi Multimedia is a QoS feature defined by WiFi Alliance before IEEE 802.11e was
finalized. Now it is part of IEEE 802.11e. When it is enabled, it provides four priority queues for
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WRVS4400N User Guide
57
Firewall Tab
Setting Up and Configuring the Router
different types of traffic. It automatically maps the incoming packets to the appropriate queues
based on QoS settings (in IP or layer 2 header). WMM provides the capability to prioritize traffic
in your environment. The default is Enabled.
Change these settings as described here and click Save Settings to apply your changes, or click
Cancel Changes to cancel your changes. Help information is displayed on the right-hand side of
the screen.
WDS
Configure the WDS (Wireless Distribution System) settings for the device.
WDS MAC Address—
Displays the read-only MAC address for the WDS.
Allow wireless signal to be repeated by a repeater—
Select Auto or Manual as required.
Remote Access Point's MAC Address—
Either enter the MAC address directly, or, if the other
AP is on-line, you can click the Site Survey button and select from a list of available APs.
Change these settings as described here and click Save Settings to apply your changes, or click
Cancel Changes to cancel your changes. Help information is displayed on the right-hand side of
the screen.
Firewall Tab
Configure software security features like SPI (Stateful Packet Inspection) Firewall, IP based
Access List, restriction LAN users on Internet (WAN port) access, and NAPT (Network Address
Port Translation) to limited services to specific ports. Settings only work when NAT is enabled.
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WRVS4400N User Guide
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Firewall Tab
Setting Up and Configuring the Router
Note that for WAN traffic, NAPT settings are applied first, then the SPI Firewall settings, followed
by IP based Access List (which requires more CPU power).
Basic Settings
Firewall
:
SP—
(Stateful Packet Inspection) Firewall, when you enable this feature, the Router
will perform deep packet inspection on all the traffic going through the Router and drop the
packets that do not follow the pre-defined protocol behavior. The default is
Enable
.
DoS Protection
—When enabled, the Router will prevent DoS (Denial of Service) attacks
coming in from the Internet. DOS attacks are making your Router’s CPU busy such that it cannot
provide services to regular traffic. The default Is
Enable
.
Block WAN Request
—When enabled, the Router will ignore PING Request from the Internet so
it seems to be hidden. The default is
Enable
.
Remote Management
—When enabled, the Router will allow the Web-based Utility to be
accessed from the Internet. The default is
Disable
.
Multicast Pass-through
—When enabled, the Router will allow IP Multicast traffic to come in
from the Internet. The default is
Disable
.
SIP Application Layer Gateway—
When enabled, the SIP Application Layer Gateway (ALG)
allows Session Initiation Protocol (SIP) packets (used for Voice over IP) to traverse the NAT
firewall. This feature can be disabled if the VoIP service provider is using other NAT traversal
solutions such as STUN, TURN, and ICE.
Block—
Select the Web features that you wish to restrict. All those features could place security
concern to your PCs on the LAN side. You have to balance your needs on those applications and
security. The default is unselected.
•
J
ava
—Java is a programming language for websites. If you deny Java, you run the risk of
not having access to Internet sites created using this programming language.
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WRVS4400N User Guide
59
Firewall Tab
Setting Up and Configuring the Router
•
Cookies
—A cookie is data stored on your PC and used by Internet sites when you
interact with them, so you may not want to deny cookies.
•
ActiveX
—ActiveX is a Microsoft (Internet Explorer) programming language for
websites. If you deny ActiveX, you run the risk of not having access to Internet sites
using this programming language. Also, Windows Update uses ActiveX, so if this is
blocked, Windows update will not work.
•
Access to Proxy HTTP Server
—If local users have access to WAN proxy servers, they
may be able to circumvent the Router's content filters and access Internet sites blocked
by the Router. Denying Proxy will block access to any WAN proxy servers.
Change these settings as described here and click
Save Settings
to apply your changes, or click
Cancel Changes
to cancel your changes. Help information is displayed on the right-hand side
of the screen, and click
More
for additional details.
IP Based ACL
This screen shows a summary of configured IP based Access List. The Access List is used to
restrict traffic going through the Router either from WAN or LAN port. There are two ways to
restrict data traffic. You can block specific types of traffic according to your ACL definitions. Or
you can allow only specific types of traffic according to your ACL definition. The ACL rules will
be read according to its priority. If there is a match for a packet, the action will be taken and
following lower priority rules will not be checked against this packet.
Note that the higher the number of rules that need to be checked against packets, the lower
the throughput. Use ACL rules with caution.
There are two default rules in the table that cannot be deleted. The first rule will allow all traffic
coming in from LAN port to pass the Router. The second rule will allow all traffic coming in from
WAN port. These two rules have the lowest priority, so without adding any user defined rules,
all the packets can be passed through from both WAN and LAN sides.
The rule will be enabled when the Enable button is checked, and when Date and Time are
matched. If any of conditions are not met, the rule will not be used to check against packets.
The following are descriptions on each of the fields in the ACL Table:
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