Netgear D6100 Manual Do Utilizador

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 a device in the data path uses a lower MTU 
setting than the other devices, the data packets must be split or “fragmented” to 
accommodate the device with the smallest MTU. 

The best MTU setting for NETGEAR equipment is often the default value. In some situations, 
changing the value fixes one problem but causes another. 

Leave the MTU unchanged unless one of these situations occurs:

You experience 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 web-based applications might require an MTU change:

A secure website that does not open or displays only part of a web page

Yahoo email

MSN portal

America Online’s DSL service

You use VPN and experience severe performance problems.

You used a program to optimize MTU for performance reasons and now you are 
experiencing 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. The following table describes common MTU sizes and 
applications. 

1500

The largest Ethernet packet size. This setting is typical for connections that do not use PPPoE 
or VPN and is the default value for NETGEAR modem 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 send or receive large email attachments, for example.

1436

Used in PPTP environments or with VPN.

1400

Maximum size for AOL DSL.