Asus RX3042H - Manual (Page 16)

Getting to Know RX3042H RX3042H User's Manual
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contains a pool of network ports to be used for translation.
Every packet is translated with the globally valid IP address;
the port number is translated with a free pool from the pool of
network ports.
• Reverse NAPT – Also called inbound mapping, port mapping,or
virtual server. Any packet coming to the router can be relayed
to an internal host based on the protocol, port number and/or
IP Address specified in the rule. This is useful when multiple
services are hosted on different internal hosts.
2.3.2 Firewall Features
The firewall as implemented in RX3042H provides the following
features to protect your network from being attacked and to prevent
your network from being used as the springboard for attacks.
• Stateful Packet Inspection
• Packet Filtering (ACL)
• Defense against Denial of Service Attacks
• Log
2.3.2.1 Stateful Packet Inspection
The RX3042H Firewall uses “stateful packet inspection” that
extracts state-related information required for the security decision
from the packet and maintains this information for evaluating
subsequent connection attempts. It has awareness of application
and creates dynamic sessions that allow dynamic connections so
that no ports need to be opened other than the required ones. This
provides a solution which is highly secure and that offers scalability
and extensibility.
2.3.2.2 Packet Filtering – ACL (Access Control List)
ACL rule is one of the basic building blocks for network security.
Firewall monitors each individual packet, decodes the header
information of inbound and outbound traffic and then either blocks
the packet from passing or allows it to pass based on the contents
of the source address, destination address, source port, destination
port, and protocol defined in the ACL rules.