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PPPoE MTU should be set between 546 and 1492.
Maximum Idle Time (60-3600)
Set a period of time to disconnect PPPoE connection, when user’s idle
time greater than it.
The Maximum Idle Time is only worked on the auto-connect mode. It makes no effect on
manual-on mode and keep-alive mode (see Connection Mode).
Connection Mode
Three connection modes are designed to fit different request. They are keep-alive,
manual-on, and auto-connect mode.
For the manual-on mode, you have to dial-on and cut out the connection manually.
The keep-alive mode will make the connection always on. If the line is dropped, the
modules will try to connect to the PPPoE server always.
The auto-connect mode is designed to save the communication cost for the user. In the
beginning of powered on, the link will not be built.
Instead, the gateway monitors the traffic from LAN side to the Internet.
The sooner routing traffic was issued, the later PPPoE link is established.
The gateway continually watches the LAN to WAN traffic, if there is no activity for more
than the Maximum Idle Time, the connection will be dropped.