User's Manual

154
PPP SETTINGS
The PPP username and password are dependent on the
requirements of the ISP. The user name can be a maximum of
256 characters and the password a maximum of 32 characters in
length. (Authentication Method: AUTO, PAP, CHAP, or MSCHAP.)
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 congured 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 specically 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