NETGEAR DM200 User Manual page 53

Broadband High-Speed DSL Modem Model DM200
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
• 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.
Table 2. Common MTU sizes
MTU Application
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 the modem.
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.
1458 Used in PPPoA environments.
1436 Used in PPTP environments or with VPN.
Manage the Internet Settings Manually
53