ZyXEL ADSL2+4 Bedienungsanleitung PDF herunterladen (Seite 122)

Chapter 9 Firewalls

P-660H-T1v3s User’s Guide

122

DoS

Denials 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

ZyXEL Device is pre-configured to automatically detect and thwart all known DoS

attacks.

DDoS

A DDoS attack is one in which multiple compromised systems attack a single

target, thereby causing denial of service for users of the targeted system.

LAND Attack

In a LAND attack, hackers flood SYN packets into the network with a spoofed

source IP address of the target system. This makes it appear as if the host

computer sent the packets to itself, making the system unavailable while the

target system tries to respond to itself.

Ping of Death

Ping of Death uses a "ping" utility to create and send an IP packet that exceeds

the maximum 65,536 bytes of data allowed by the IP specification. This may

cause systems to crash, hang or reboot.

SPI

Stateful Packet Inspection (SPI) tracks each connection crossing the firewall and

makes sure it is valid. Filtering decisions are based not only on rules but also

context. For example, traffic from the WAN may only be allowed to cross the

firewall in response to a request from the LAN.

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ZyXEL ADSL2+4 Bedienungsanleitung Seite 122