MicroNet SP5004P, Руководство пользователя

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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. DNS