Netgear WNR2000v2 WNR2000 User Manual - Page 93

America Online's DSL service, Table 5-1., Common MTU Sizes

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NETGEAR Wireless-N Router WNR2000 User Manual 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 either the technical support of the ISP or of NETGEAR recommends changing the MTU size. These might require an MTU change: - A secure Web site that will not 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. If you suspect an MTU problem, a common solution is to change the MTU size to 1400. If you are willing to experiment, you can gradually reduce the MTU size from the maximum value of 1500 until the problem goes away. Table 5-1 describes common MTU sizes and applications. Table 5-1. Common MTU Sizes MTU 1500 1492 1472 1468 1460 1436 1400 576 Application The largest Ethernet packet size and the default value. This is the typical setting for nonPPPoE, non-VPN connections, and is the default value for NETGEAR routers, adapters, and switches. Used in PPPoE environments. Maximum size to use for pinging. (Larger packets are fragmented.) Used in some DHCP environments. Usable by AOL if you do not have large e-mail attachments, for example. Used in PPTP environments or with VPN. Maximum size for AOL DSL. Typical value to connect to dial-up ISPs. Fine-Tuning Your Network v1.3, February 2009 5-17

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NETGEAR Wireless-N Router WNR2000 User Manual
Fine-Tuning Your Network
5-17
v1.3, February 2009
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 either the technical
support of the ISP or of NETGEAR recommends changing the MTU size. These might require
an MTU change:
–
A secure Web site that will not 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.
If you suspect an MTU problem, a common solution is to change the MTU size to 1400. If you are
willing to experiment, you can gradually reduce the MTU size from the maximum value of 1500
until the problem goes away.
Table 5-1
describes common MTU sizes and applications.
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 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 do not 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.