NETGEAR WNDR3400 user manual Quality of Service QoS, Common MTU Sizes, Application

N600 Wireless Dual Band Router WNDR3400 User Manual

•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.

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 6-2describes common MTU sizes and applications.

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.

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.

Fine-Tuning Your Network 6-7

v1.0, August 2010