SMC Networks SMC7404BRA EU manual 4-42, Enable SPI and, Anti-DoS firewall, protection

CONFIGURING THE BARRICADE

The Barricade’s firewall inspects packets at the application layer, maintains TCP and UDP session information including timeouts and number of active sessions, and provides the ability to detect and prevent certain types of network attacks such as DoS attacks.

Network attacks that deny access to a network device are called Denial-of-Service (DoS) attacks. Denial of Service (DoS) attacks are aimed at devices and networks with a connection to the Internet. Their goal is not to steal information, but to disable a device or network so users no longer have access to network resources.

The Barricade protects against the following DoS attacks: Ping of Death (Ping flood) attack, SYN flood attack, IP fragment attack (Teardrop Attack), Brute-force attack, Land Attack, IP Spoofing attack, IP with zero length, TCP null scan (Port Scan Attack), UDP port loopback, Snork Attack etc.

Note: The firewall does not significantly affect system performance, so we advise enabling the prevention features to protect your network.

Parameter	Defaults	Description
Enable SPI and	Yes	The Intrusion Detection feature of the Barricade
Anti-DoS firewall		limits the access of the incoming traffic at the
protection		WAN port. When the SPI feature is turned on,
		all incoming packets are blocked except those
		types marked with a check in the Stateful Packet
		Inspection section at the top of the screen.

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