User's Manual Part 1

III Features & Configurations
36
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, or FTP or
POP servers.
2.3 WAN Speed
Click Basic -> WAN Speed to the configuration interface. Here you can configure the WAN speed
and duplex mode.
Tip--------------------------------------------------------------------------------------------------------------------------------------------
1. The router operates in "Auto-negotiation" (or Auto) mode by default. Usually, it works for most
cases.
In some situations, you might need to change the port mode. For example, if the cable connected
to your router's WAN port is longer than 100m, you may need to use 10M full-duplex or 10M
half-duplex for better performance. Ensure that your router's WAN port operates with the same
speed and duplex mode as the remote link partner. If not, your router's WAN port may not receive
and send data.