NETGEAR
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
–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
Table 5-1. Common MTU Sizes
MTU | Application |
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1500 | The largest Ethernet packet size and the default value. This is the typical setting for non- | |
| PPPoE, | |
| and switches. |
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1492 | Used in PPPoE environments. |
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1472 | Maximum size to use for pinging. (Larger packets are fragmented.) |
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1468 | Used in some DHCP environments. |
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1460 | Usable by AOL if you do not have large |
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1436 | Used in PPTP environments or with VPN. |
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1400 | Maximum size for AOL DSL. |
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576 | Typical value to connect to |
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