Are you Denied Access to Any Website or Internet?

A web server goes down. People not able to access it! This is a phenomenon of recent attacks on a few popular sites and has taken on new dimensions from the effective Denial of service attacks to DDoS- Distributed Denial of Service and DRDoS-Distributed reflected denial of service. Denial of service attacks may be targeting a single system but have an effect on the entire network. If the internet bandwidth between server and router is affected then the intranet cannot function. If DoS and DDoS attack is done on a large scale it can effectively bring down huge geographical sections of the internet.

Denial of service Attacks

An attack that is made across the internet (network) from a single system having a higher bandwidth connection causing the destination (single system or network) to cease proper functioning and thereby making it crash is termed as a DoS-Denial of Service attack. The ways this has been done in the past is to

• Make a device dysfunctional. This is done by deleting or changing configurations of the device or by power interruptions.
• Make a device overwhelmed by bogus service requests such that it is unable to function properly. This is more an attack on the computational resource of a device or system. By overloading this resource it cause degradation of service to a point where the device/system crashes.
• Consume the network bandwidth by flooding a system.
• Nuke attack uses a modified ping utility to continually send fragmented data (ICMP packets) to the target slowing down the affected computer. Nuke attacks also refer to sending continuous messages in instant messenger or online gaming. Techniques have been put into place to stop third party flood control.
• Win Nuke is a remote denial of service affecting Windows 95, NT and 3.1X operating systems. The exploit is an out of band data to the target computer causing the blue screen of death.
• Ping of Death is sending a malicious ping to a computer system. Ping is usually 64 bytes in size. Sending a ping with size more than 64 bytes crashes the system due to buffer overflow that occurs at time of reassembling the packet. This is called ping of death and is an exploit of the past since remedial measures have been implemented in systems and devices affected like UNIX, Linux, Mac, Windows, Printers and Routers.
  

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by: http://kedirizone.blogspot.com

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