A-Link WNAP4G User Manual page 33

 Connect-on-demand: The device won't try to connect to Internet until LAN
PCs or devices try to go to Internet. Once Internet connection is established,
this device will drop the connection if maximum idle time is reached.
 Manually: The device won't try to connect to Internet until users press
"connect" button at Status page. Once Internet connection is established, this
device will drop the connection if maximum idle time is reached.
h. Maximum Idle Time: the time of no activity to disconnect your PPTP
session. Set it to zero or enable "Auto-reconnect" to disable this feature.
i. Maximum Transmission Unit (MTU): Most ISP offers MTU value to users.
The default MTU value is 0 (auto).
j. IGMP Proxy: Enable this feature allows multicast stream (e.g. IPTV
stream) to pass-through this device.
Note: The items with * above are only available when choosing Static IP
Address in IP mode.
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A-LINK WNAP4G User Manual