Firewall – D-Link DSL 2740B User Manual
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WLAN QoS Window (2)
FIREWALL
The Firewall Configuration window allows the Router to enforce specific predefined policies intended to protect
against certain common types of attacks. There are two general types of protection (DoS, Port Scan) that can be enabled
on the Router, as well as filtering for specific packet types sometimes used by hackers.
SPI (Stateful Packet Inspection) is a firewall feature that checks the state of network connections. Only legitimate
packets are allowed to passthrough.
A DoS (denial-of-service) attack is characterized by an explicit attempt by attackers to prevent legitimate users of a
service from using that service. Examples include: attempts to "flood" a network, thereby preventing legitimate network
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