Tenda 4G600, User Manual

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III Features & Configurations | Tenda
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B. You use VPN and encounter serious performance problems.
C. You used a program to optimize MTU for performance reasons, and now you
have connectivity or performance problems.
If you suspect an MTU problem, try changing the MTU to 1400. If this does not
help, gradually reduce the MTU from the maximum value of 1500 until the
problem disappears.
The common MTU sizes and applications are listed in the table below.
MTU Application
1500 Typical for connections that do not use PPPoE or VPN.
1492 Used in PPPoE environments.
1472
Maximum size to use for pinging. (Larger packets are
fragmented.)
1468 Used in some DHCP environments.
1436 Used in PPTP environments or with VPN.
Note
A wrong/improper MTU value may cause Internet communication problems. For
example, you may be unable to access certain Websites, frames within
Websites, secure login pages, FTP or POP servers.
2.3 WAN Speed (Available only in Wireless Router Mode)
Click Basic -> WAN Speed to enter the configuration interface. Here you can
configure the WAN speed and duplex mode.