D-Link DSL-2740U User Manual download pdf (Page 61)

Section 3 - Configuration

D-Link DSL-2740U User Manual

FIREWALL

The Firewall 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. The parameters used here are region-dependant. Please contact your local ISP for the optimized values.

To access the FIREWALL setting window, click on the Firewall button under the ADVANCED tab.

FIREWALL SETTINGS

SPI:

SPI (Stateful Packet Inspection) is a firewall feature

that checks the state of network connections. Only

legitimate packets are allowed to pass through.

DoS and Port

Scan

Protection:

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 traffic,

attempts to disrupt connections between two

machines, thereby preventing access to a service,

attempts to prevent a particular individual from

accessing a service, or, attempts to disrupt service

to a specific system or person.

Port scan protection is designed to block attempts

to discover vulnerable ports or services that might

be exploited in an attack from the WAN.

Rate & Burst

The Rate is the trigger threshold. When the

specified packets number has reached this rate, it

triggers once.

The Burst is the consecutive trigger number

allowed.

The router will stop all related application when the

Burst is matched and resume working after the

Rate is reduced below the configured number.

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D-Link DSL-2740U User Manual Page 61