Denial-of-service attack
In computing, a denial-of-service (DoS) attack is an attempt to make a machine or network resource unavailable to its intended users, such as to temporarily or indefinitely interrupt or suspend services of a host connected to the Internet. A distributed denial-of-service (DDoS) is where the attack source is more than one, often thousands of, unique IP addresses. It is analogous to a group of people crowding the entry door or gate to a shop or business, and not letting legitimate parties enter into the shop or business, disrupting normal operations.
Criminal perpetrators of DoS attacks often target sites or services hosted on high-profile web servers such as banks, credit card payment gateways. Motives of revenge, blackmail or activism can be behind other attacks.
The scale of DDoS attacks has continued to rise over recent years, even reaching over 400Gbit/s
Symptoms
The United States Computer Emergency Readiness Team (US-CERT) defines symptoms of denial-of-service attacks to include:
- Unusually slow network performance (opening files or accessing web sites)
- Unavailability of a particular web site
- Inability to access any web site
- Dramatic increase in the number of spam emails received (this type of DoS attack is considered an e-mail bomb)[7]
- Disconnection of a wireless or wired internet connection
- Long-term denial of access to the web or any internet services
- If the attack is conducted on a sufficiently large scale, entire geographical regions of Internet connectivity can be compromised without the attacker's knowledge or intent by incorrectly configured or flimsy network infrastructure equipment.
Wikipedia
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