Asus DSL-N12HP User Manual page 142

ENABLE NAT
If the LAN is configured with a private IP address, the user
should select this checkbox. The NAT submenu will appear in the
Advanced Setup menu after reboot. On the other hand, if a private
IP address is not used on the LAN side (i.e. the LAN side is using a
public IP), this checkbox should not be selected to free up system
resources for better performance.
ENABLE FIREWALL
If this checkbox is selected, the Security submenu will be
displayed on the Advanced Setup menu after reboot. If firewall
is not necessary, this checkbox should not be selected to free up
system resources for better performance.
USE STATIC IPv4 ADDRESS
Unless your service provider specially requires it, do not select
this checkbox. If selected, enter the static IP address in the IPv4
Address field.
Don't forget to adjust the IP configuration to Static IP Mode as
described in section 2.2 IP configuration.
FIXED MTU
Maximum Transmission Unit. The size (in bytes) of largest protocol
data unit which the layer can pass onwards. This value is 1500 for
PPPoA.
ENABLE PPP DEBUG MODE
When this option is selected, the system will put more PPP
connection information into the system log. This is for debugging
errors and not for normal usage.
BRIDGE PPPOE FRAMES BETWEEN WAN AND LOCAL PORTS
(This option is hidden when PPP IP Extension is enabled)
When Enabled, this creates local PPPoE connections to the WAN
side. Enable this option only if all LAN-side devices are running
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