•Conceptually, DoS attacks are intended to prevent legitimate users, customers or clients of a site from successfully accessing it.

•Traditional DoS attacks have been aimed at consuming resources or disrupting services at the network or operating system level.

•Typical examples are server-based attacks such as SYN floods and bandwidth exhaustion attacks that attempt to saturate the victim’s Internet connection with spurious traffic.

•Death by overloading of system.

•Denial Of Services:

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•In a denial-of-service (DoS) attack, an attacker attempts to pre

vent legitimate users from accessing information or services. By targeting your computer and its network connection, or the computers and network of the sites you are trying to use, an attacker may be able to prevent you from accessing email, web sites, online accounts (banking, etc.), or other services that rely on the affected computer.

• ping [IP ADDRESS HERE or WEBSITE] -t -l 15000

•Oversized Packets:

This is called the "Ping of Death" (ping -1 65510

192.168.2.3) an a Windows system (where 192.168.2.3 is the IP adress of the intended victim). What is happening is the attacker is pinging every port on the victims computer causing it to echo back 65510 requests.

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•The main goals of the "Ping of Death" is to generate a packet size that exceeds 65,535 bytes. Which can abrubtly cause the victim computer to crash.

Symptoms of DOS ATTACK:

• unusually slow network performance (opening files or accessing web sites)

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• unavailability of a particular web site

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• inability to access any web site

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• dramatic increase in the amount of spam you receive in your account