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WLAN VDSL Gateway User Manual
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PPPoA and 1492 for PPPoE. Do not change these values unless your ISP asks you
to.
The gateway can be configured to disconnect if there is no activity for a specific period
of time by selecting the Dial on demand check box and entering the Inactivity
timeout . The entered value must be between 1 minute and 4320 minutes.
The PPP IP Extension is a special feature deployed by some service providers.
Unless your service provider specifically requires this setup, do not select it. If you
need to select it, the PPP IP Extension supports the following conditions:

It allows only one computer on the LAN.

The public IP address assigned by the remote using the PPP/IPCP
protocol is actually not used on the WAN PPP interface. Instead, it
is forwarded to the computer's LAN interface through DHCP. Only
one system on the LAN can be connected to the remote, since the
DHCP server within the ADSL gateway has only a single IP
address to assign to a LAN device.

NAPT and firewall are disabled when this option is selected.

The gateway becomes the default gateway and DNS server to the
computer through DHCP using the LAN interface IP address.

The gateway extends the IP subnet at the remote service provider to
the LAN computer. That is, the PC becomes a host belonging to the
same IP subnet.

The ADSL gateway bridges the IP packets between WAN and LAN
ports, unless the packet is addressed to the gateway's LAN IP
address.
9. Select WAN interface as the system default gateway. Click Next .