Netgear R6900 - Nighthawk AC1900 Smart WiFi Router User Manual (en)

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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.
Table 3. Common MTU sizes
Application
MTU
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 routers, adapters, and switches.
1500
Used in PPPoE environments.
1492
Maximum size to use for pinging. (Larger packets are fragmented.)
1472
Used in some DHCP environments.
1468
Usable by AOL if you do not send or receive large email attachments, for example.
1460
Used in PPPoA environments.
1458
Used in PPTP environments or with VPN.
1436
Maximum size for AOL DSL.
1400
Change the MTU Size
WARNING:
An incorrect MTU setting can cause Internet communication problems. For example,
you might not be able to access certain websites, frames within websites, secure
login pages, or FTP or POP servers. Change the MTU only if you are sure that it is
necessary for your ISP connection.
Specify Your Internet Settings
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Nighthawk AC1900 Smart WiFi Router Model R6900