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NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
5-18
Fine-Tuning Your Network
v1.0, February 2008
3.
From the
Priority Category
list, select
Ethernet LAN Port
. The QoS - Priority Rules screen
changes:
4.
From the
LAN port
list, select the LAN port that will have a QoS policy.
5.
From the
Priority
drop-down list, select the priority that this port’s traffic should receive
relative to other applications and traffic when accessing the Internet. The options are Low,
Normal, High, and Highest.
6.
Click
Apply
to save this rule to the QoS Policy list and return to the QoS Setup screen.
7.
In the QoS Setup screen, select the
Turn Internet Access QoS On
check box.
8.
Click
Apply
.
QoS for a MAC Address
To create a QoS policy for traffic from a specific MAC address, follow these steps:
1.
From the main menu, under Advanced, select
QoS Setup
. The QoS Setup screen displays, as
shown in
Figure 5-6 on page 5-15
.
2.
Click
Add Priority Rule
.
Figure 5-9
Page 87 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Fine-Tuning Your Network
5-19
v1.0, February 2008
3.
From the
Priority Category
list, select
MAC Address
. The QoS - Priority Rules screen
changes:
4.
If the device to be prioritized appears in the MAC Device List, select it. The information from
the MAC Device List will be used to populate the policy name, MAC Address, and Device
Name fields. If the device does not appear in the MAC Device List, click
Refresh
. If it still
does not appear, you must complete these fields manually.
5.
From the
Priority
drop-down list, select the priority that this device’s traffic should receive
relative to other applications and traffic when accessing the Internet. The options are Low,
Normal, High, and Highest.
6.
Click
Apply
to save this rule to the QoS Policy list and return to the QoS Setup screen.
7.
In the QoS Setup screen, select the
Turn Internet Access QoS On
check box.
8.
Click
Apply
.
Editing or Deleting an Existing QoS Policy
To edit or delete an existing QoS policy:
1.
From the main menu, under Advanced, select
QoS Setup
. The QoS Setup screen displays, as
shown in
Figure 5-6 on page 5-15
.
2.
Select the radio button next to the QoS policy to be edited or deleted, and do one of the
following:
Figure 5-10
Page 88 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
5-20
Fine-Tuning Your Network
v1.0, February 2008
•
Click
Delete
to remove the QoS policy.
•
Click
Edit
to edit the QoS policy. Follow the instructions in the preceding sections to
change the policy settings.
3.
Click
Apply
in the QoS Setup screen to save your changes.
Changing the MTU
The Maximum Transmission Unit (MTU) is the largest data packet a network device transmits.
When one network device communicates across the Internet with another, the data packets travel
through many devices along the way. If any device in the data path has a lower MTU setting than
the other devices, the data packets must be split or “fragmented” to accommodate the one with the
smallest MTU.
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 the technical support
of either the ISP or NETGEAR recommends changing the MTU setting. These might require
an MTU change:
–
A secure Web site that won’t 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.
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.
Page 89 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Fine-Tuning Your Network
5-21
v1.0, February 2008
If you suspect an MTU problem, a common solution is to change the MTU to 1400. If you are
willing to experiment, you can gradually reduce the MTU from the maximum value of 1500 until
the problem goes away.
Table 5-1
describes common MTU sizes and applications.
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.
Optimizing Your Network Bandwidth
As your network grows, it might consist of several segments of different networking technologies,
each providing different throughput. In planning your network, you should first consider which
devices will have the heaviest traffic flow between them. Examples are:
•
A media center in one room streaming high-definition video from a server in another room
•
A storage device that is used for backing up your computers
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 don't 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 90 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
5-22
Fine-Tuning Your Network
v1.0, February 2008
Next, consider the throughput of your network devices. Where possible, make the heaviest-traffic
connections using higher-speed technologies, with no lower-speed bottlenecks in the path.
Figure 5-11
shows a sample network using multiple networking technologies. In this network, the
two PCs with Gigabit (1000 Mbps) Ethernet adapters have a gigabit connection through the GS605
switch to the storage server. This connection should allow for extremely fast backups or quick
access to large files on the server. The PC connected through a pair of Powerline HD adapters is
limited to the 200 Mbps speed of the Powerline HD connection. Although any of the links in this
example would be sufficient for high-traffic applications such as streaming HD video, the use of
older devices such as 10 Mbps Ethernet or 802.11b wireless would create a significant bottleneck.
Figure 5-11
RangeMax Dual
Band Wireless-N
Router WNDR3300

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