Asus DSL-N12HP users manual in English - Page 141

ENABLE FULLCONE NAT, DIAL ON DEMAND, PPP IP EXTENSION, to the same IP subnet.

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ENABLE FULLCONE NAT This option becomes available when NAT is enabled. Known as one-to-one NAT, all requests from the same internal IP address and port are mapped to the same external IP address and port. An external host can send a packet to the internal host, by sending a packet to the mapped external address. DIAL ON DEMAND The DSL-N12HP can be configured to disconnect if there is no activity for a period of time by selecting the Dial on demand checkbox. You must also enter an inactivity timeout period in the range of 1 to 4320 minutes. PPP IP EXTENSION 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. PPP IP Extension does the following: • Allows only one PC on the LAN. • Disables NAT and Firewall. • The device becomes the default gateway and DNS server to the PC through DHCP using the LAN interface IP address. • The device extends the IP subnet at the remote service provider to the LAN PC. i.e. the PC becomes a host belonging to the same IP subnet. • The device bridges the IP packets between WAN and LAN ports, unless the packet is addressed to the device's LAN IP address. • The public IP address assigned by the remote side using the PPP/IPCP protocol is actually not used on the WAN PPP interface. Instead, it is forwarded to the PC LAN interface through DHCP. Only one PC on the LAN can be connected to the remote, since the DHCP server within the device has only a single IP address to assign to a LAN device. 141

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141
ENABLE FULLCONE NAT
This option becomes available when NAT is enabled. Known as
one-to-one NAT, all requests from the same internal IP address
and port are mapped to the same external IP address and port. An
external host can send a packet to the internal host, by sending a
packet to the mapped external address.
DIAL ON DEMAND
The DSL-N12HP can be configured to disconnect if there is no
activity for a period of time by selecting the Dial on demand
checkbox. You must also enter an inactivity timeout period in the
range of 1 to 4320 minutes.
PPP IP EXTENSION
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.
PPP IP Extension does the following:
• Allows only one PC on the LAN.
• Disables NAT and Firewall.
• The device becomes the default gateway and DNS server to
the PC through DHCP using the LAN interface IP address.
• The device extends the IP subnet at the remote service
provider to the LAN PC. i.e. the PC becomes a host belonging
to the same IP subnet.
• The device bridges the IP packets between WAN and LAN
ports, unless the packet is addressed to the device’s LAN IP
address.
• The public IP address assigned by the remote side using
the PPP/IPCP protocol is actually not used on the WAN PPP
interface. Instead, it is forwarded to the PC LAN interface
through DHCP. Only one PC on the LAN can be connected to
the remote, since the DHCP server within the device has only
a single IP address to assign to a LAN device.