User's Manual
30
Knowledge Expansion
MTU: Maximum Transmission Unit. It is the size of the largest data packet that can be sent
over the network. The default value is 1500.
The common MTU sizes and applications are listed in the table below.
MTU
Application
1500
Typical for connections that do not use PPOE or VPN.
1492
Used in PPOE 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, or
FTP or POP servers.
Do not modify it unless necessary, but if a specific website or web application software cannot
open or be enabled, you can try to change the MTU value to 1500, 1400.