Dynamix UM-S Manuel d'utilisateur télécharger pdf (Page 12)

G.shdsl Router User Manual 152

Level 5: Application

Level 4: TCP

Level 3: IP

Level 2: Data Link

Level 1: Physical

Telnet

FTP

Http

SMTP

Host PC

Proxy Server

Public Server

Request Page

Check URL

Request Page

Return Page

Filter Content

External

Interface

Internal

Interface

Proxy Application

Denial of Service Attack

Denial of service (DoS) attacks typically come in two

flavors: resource starvation and resource overload. DoS

attacks can occur when there is a legitimate demand for

a resource that is greater than the supply (i.e. too many

web requests to an already overloaded web server).

Software vulnerabilities or system misconfigurations can also cause DoS situations. The

difference between a malicious denial of service and simple system overload is the requirement of

an individual with malicious intent (attacker) using or attempting to use resources specifically to

deny those resources to other users.

Ping of death-

On the Internet, ping of death is a kind of denial of service (DoS) attack caused by

an attacker deliberately sending an IP packet larger than the 65,536 bytes allowed by the IP

protocol. One of the features of TCP/IP is fragmentation; it allows a single IP packet to be broken

down into smaller segments. Attackers began to take advantage of that feature when they found

that a packet broken down into fragments could add up to more than the allowed 65,536 bytes.

Many operating systems didn't know what to do when they received an oversized packet, so they

froze, crashed, or rebooted. Other known variants of the ping of death include teardrop, bonk and

nestea.

Inturruption

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Dynamix UM-S Manuel d'utilisateur Page 12

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