Netgear WNDR3400 User Manual Page 105

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N600 Wireless Dual Band Router WNDR3400 User Manual
Fine-Tuning Your Network 6-7
v1.0, August 2010
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 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 6-2 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.
Quality of Service (QoS)
QoS is an advanced feature that can be used to prioritize some types of traffic ahead of others. The
WNDR3400 router can provide QoS prioritization over the wireless link and on the Internet
connection. To configure QoS, use the QoS Setup screen.
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 6-2. 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.
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