Asus SL1200 - Manual (Page 22)

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Chapter 1 - Introduction
ASUS SL1200
2.4 Major Features
2.4.1 Firewall Features
The ASUS SL1200's firewall provides features to protect your network
from being attacked and to prevent your network from being used as the
springboard for attacks.
The firewall features are:
• Address Sharing and Management
• Packet Filtering
• Stateful Packet Inspection
• Defense against Denial of Service Attacks
•Application Content Filtering
• Log and Alert
• Remote Access
• Keyword based URL Filtering
2.4.1.1 Address Sharing and Management
The ASUS SL1200's firewall provides Network Address Translation
(NAT) to share a single high-speed Internet connection. NAT saves the
cost of multiple connections required for the hosts on the LAN segments
connected to the router. It conceals network address and prevents
them from becoming public. It maps unregistered IP addresses of hosts
connected to the LAN with valid ones for Internet access.
The router's firewall also provides reverse NAT capability, which enables
SOHO users to host various services such as e-mail servers, web servers,
etc. The NAT rules drive the translation mechanism at the NAT router.
The router supports these NAT types:
• Static NAT: It maps an internal host address to a globally valid
Internet address (one-to-one). All packets are directly translated with
the information contained in the map.