8.4 WAN Connection Settings (Common)
The remaining WAN-related settings are common to the WAN connection:
Physical Interface Settings
This is the port speed of the WAN connection. It should be set to the same speed
as the connected device in case of any port negotiation problems.
When a static speed is set, you may choose whether to advertise its speed to the
peer device or not. Advertise Speed is selected by default. You can choose not to
advertise the port speed if the port has difficulty in negotiating with the peer device.
Default: Auto
This field is for specifying the Maximum Transmission Unit value of the WAN
connection. An excessive MTU value can cause file downloads stall shortly after
connected. You may consult your ISP for the connection's MTU value. Default
value is 1440.
This field is for specifying the Maximum Segment Size of the WAN connection.
When Auto is selected, MSS will be depended on the MTU value. When Custom is
selected, you may enter a value for MSS. This value will be announced to remote
TCP servers for maximum data that it can receive during the establishment of TCP
connections.
Some Internet servers are unable to listen to MTU setting if ICMP is filtered by
firewall between the connections.
Normally, MSS equals to MTU minus 40. You are recommended to reduce the MSS
only if changing of the MTU value cannot effectively inform some remote servers to
size down data size.
Default: Auto
Some service providers (e.g. cable network) identify the client's MAC address and
require client to always use the same MAC address to connect to the network. If it
is the case, you may change the WAN interface's MAC address to the client PC's
one by entering the PC's MAC address to this field. If you are not sure, click the
Default button to restore to the default value.
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