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Page 96 / 144 Scroll up to view Page 91 - 95
NETGEAR Wireless-N 300 Router WNR2000v2 User Manual
Fine-Tuning Your Network
5-17
v1.0, January 2010
The best MTU setting for NETGEAR equipment is often just the default value, and changing the
value might fix one problem but cause another. Leave MTU unchanged unless one of these
situations occurs:
•
You have problems connecting to your ISP, or other Internet service, and either the technical
support of the ISP or of NETGEAR recommends changing the MTU size. These might require
an MTU change:
–
A secure Web site that will not open, or displays only part of a Web page
–
Yahoo e-mail
–
MSN
–
America Online’s DSL service
•
You use VPN and have severe performance problems.
•
You used a program to optimize MTU for performance reasons, and now you have
connectivity or performance problems.
If you suspect an MTU problem, a common solution is to change the MTU size to 1400. If you are
willing to experiment, you can gradually reduce the MTU size from the maximum value of 1500
until the problem goes away.
Table 5-1
describes common MTU sizes and applications.
Note:
An incorrect MTU setting can cause Internet communication problems such as the
inability to access certain Web sites, frames within Web sites, secure login pages,
or FTP or POP servers.
Table 5-1.
Common MTU Sizes
MTU
Application
1500
The largest Ethernet packet size and the default value. This is the typical setting for non-
PPPoE, non-VPN connections, and is the default value for NETGEAR routers, adapters,
and switches.
1492
Used in PPPoE environments.
1472
Maximum size to use for pinging. (Larger packets are fragmented.)
1468
Used in some DHCP environments.
1460
Usable by AOL if you do not have large e-mail attachments, for example.
1436
Used in PPTP environments or with VPN.
1400
Maximum size for AOL DSL.
576
Typical value to connect to dial-up ISPs.
Page 97 / 144
NETGEAR Wireless-N 300 Router WNR2000v2 User Manual
Fine-Tuning Your Network
5-18
v1.0, January 2010
To change the MTU size:
1.
In the main menu, under Advanced, select
WAN Setup
.
2.
In the
MTU Size
field, enter a new size between 64 and 1500.
3.
Click
Apply
to save the new configuration.
Quality of Service
Quality of Service (QoS) is an advanced feature that can be used to prioritize some types of traffic
ahead of others. The WNR2000v2 router can provide QoS prioritization over the wireless link and
on the Internet connection.
Using WMM QoS for Wireless Multimedia Applications
The WNR2000v2 router supports Wi-Fi Multimedia Quality of Service (WMM QoS) to prioritize
wireless voice and video traffic over the wireless link. WMM QoS provides prioritization of
wireless data packets from different applications based on four access categories: voice, video,
best effort, and background. For an application to receive the benefits of WMM QoS, both it and
the client running that application must be WMM enabled. Legacy applications that do not support
WMM, and applications that do not require QoS, are assigned to the best effort category, which
receives a lower priority than voice and video.
You can give prioritized Internet access to the following types of traffic:
•
For specific applications
•
For specific online games
•
On individual Ethernet LAN ports of the router
•
From a specific device by MAC address
Configuring QoS for Internet Access
To specify prioritization of traffic, you must create a policy for the type of traffic and add the
policy to the QoS Policy table in the QoS Setup screen.
To create a QoS policy:
Page 98 / 144
NETGEAR Wireless-N 300 Router WNR2000v2 User Manual
Fine-Tuning Your Network
5-19
v1.0, January 2010
From the main menu of the browser interface, under Advanced, select
QoS Setup
. The QoS Setup
screen displays:
WMM QoS is enabled by default. You can disable it by clearing the
Enable WMM
check box and
clicking
Apply
.
QoS for Applications and Online Gaming
To create a QoS policy for traffic for specific applications or online games:
1.
From the main menu of the browser interface, under Advanced, select
QoS Setup
. The QoS
Setup screen displays, as shown in
Figure 5-8
.
Figure 5-8
Page 99 / 144
NETGEAR Wireless-N 300 Router WNR2000v2 User Manual
Fine-Tuning Your Network
5-20
v1.0, January 2010
2.
Click
Setup QoS rule
. The QoS - Priority Rules screen displays.
For convenience, the QoS Policy table lists many common applications and online games that
can benefit from QoS handling.
Figure 5-9
Page 100 / 144
NETGEAR Wireless-N 300 Router WNR2000v2 User Manual
Fine-Tuning Your Network
5-21
v1.0, January 2010
3.
Click
Add Priority Rule
. The QoS - Priority Rules screen displays.
4.
In the
Priority Category
list, select either
Applications
or
Online Gaming
. In either case, a
list of predefined applications or games displays in the
Applications
drop-down list.
5.
From the
Applications
list, you can select an existing item, or you can scroll to the bottom of
the list and select
Add a New Application
or
Add a New Game
.
a.
If you chose to add a new entry, the screen expands as shown:
b.
In the
QoS Policy for
field, enter a descriptive name for the new application or game.
c.
Select the packet type, either
TCP,
UDP,
or both (
TCP/UDP
), and specify the port
number or range of port numbers used by the application or game.
Figure 5-10
Figure 5-11

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