UDP flood attack is a denial-of-service (DoS) attack using the User
Datagram Protocol (UDP), a sessionless/connectionless computer
networking protocol. Using UDP for denial-of-service attacks is not as
straightforward as with the Transmission Control Protocol (TCP).
However, a UDP flood attack can be initiated by sending a large number
of UDP packets to random ports on a remote host. As a result, the
distant host will: check for the application listening at that port, see
that no application listens at that port and reply with an ICMP
Destination Unreachable packet.
2.Ping of Death
ping of death is a type of attack on a computer that involves sending a
malformed or otherwise malicious ping to a computer. A correctly formed
ping message is typically 56 bytes in size, or 84 bytes when the
Internet Protocol (IP) header is considered. Historically, many computer
systems could not properly handle a ping packet larger than the maximum
IPv4 packet size of 65535bytes. Larger packets could crash the target
computer. In early implementations of TCP/IP, this bug was easy to
exploit. This exploit affected a wide variety of systems, including
Unix, Linux, Mac, Windows, printers, and routers.
3.Reflected / Spoofed attack
distributed denial of service attack may involve sending forged
requests of some type to a very large number of computers that will
reply to the requests. Using Internet Protocol address spoofing, the
source address is set to that of the targeted victim, which means all
the replies will go to (and flood) the target.
Nuke is an old denial-of-service attack against computer networks
consisting of fragmented or otherwise invalid ICMP packets sent to the
target, achieved by using a modified ping utility to repeatedly send
this corrupt data, thus slowing down the affected computer until it
comes to a complete stop.
Slowloris is a
piece of software written by Robert "RSnake" Hansen which allows a
single machine to take down another machine's web server with minimal
bandwidth and side effects on unrelated services and ports. Slowloris
tries to keep many connections to the target web server open and hold
them open as long as possible. It accomplishes this by opening
connections to the target web server and sending a partial request.
describes a situation where a website ends up denied, not due to a
deliberate attack by a single individual or group of individuals, but
simply due to a sudden enormous spike in popularity. This can happen
when an extremely popular website posts a prominent link to a second,
less well-prepared site, for example, as part of a news story.
7.Zero Day DDoS
General term used to describe vulnerabilities and exploits that are still new and haven't been patched yet.
SYN flood is a form of denial-of-service attack in which an attacker
sends a succession of SYN requests to a target's system in an attempt to
consume enough server resources to make the system unresponsive to