LevelOne VOI-8001 - Manual (Page 92)

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that the user does not have to worry about the MTU size, the gateway
routing engine will handle the MTU differences between PPP and the LAN
Ethernet side. But for some old PPPoE server, you have to make the MTU
size of the PPPoE side smaller than the default value, or some Web side is
not able to access.
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.
D. Bridge