Comtrend Corporation AR-5381u, User Manual

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STEP 3: This screen provides access to NAT, Firewall and IGMP Multicast settings.
Enable each by selecting the appropriate checkbox

. Click Next to
continue or click Back to return to the previous step.
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, so as to
free up system resources for improved performance.
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.
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 so as to free up system resources for better performance.