SYN flood

malicious intentsyn-floodsTCP SYN FloodTCP SYN Flood vulnerability
A SYN flood is a form of denial-of-service attack in which an attacker sends a succession of requests to a target's system in an attempt to consume enough server resources to make the system unresponsive to legitimate traffic.wikipedia
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Denial-of-service attack

denial of servicedistributed denial of serviceDDoS
A SYN flood is a form of denial-of-service attack in which an attacker sends a succession of requests to a target's system in an attempt to consume enough server resources to make the system unresponsive to legitimate traffic.
Some common examples of DDoS attacks are fraggle, smurf, and SYN flooding.

Transmission Control Protocol

TCPTCP/IPACK
Normally when a client attempts to start a TCP connection to a server, the client and server exchange a series of messages which normally runs like this:
This is known as a SYN flood attack.

SYN cookies

6) SYN cookies
SYN cookie is a technique used to resist SYN flood attacks.

TCP half-open

half-openhalf-open connectionHalf-Open TCP
However, in an attack, the half-open connections created by the malicious client bind resources on the server and may eventually exceed the resources available on the server.
The lack of synchronization could be due to malicious intent.

Client (computing)

clientclientsclient software
Normally when a client attempts to start a TCP connection to a server, the client and server exchange a series of messages which normally runs like this:

Server (computing)

serverserversserver computer
Normally when a client attempts to start a TCP connection to a server, the client and server exchange a series of messages which normally runs like this:

IP address spoofing

spoofedspoofingIP address
The malicious client can either simply not send the expected, or by spoofing the source IP address in the, causing the server to send the to a falsified IP address - which will not send an because it "knows" that it never sent a.

IP address

IPIP addressesaddress
The malicious client can either simply not send the expected, or by spoofing the source IP address in the, causing the server to send the to a falsified IP address - which will not send an because it "knows" that it never sent a.

LAND

LAND attack
It is, however, distinct from the TCP SYN Flood vulnerability.

TCP Cookie Transactions

TCP Cookie Transactions (TCPCT) is specified in RFC 6013 (historic status, formerly experimental) as an extension of Transmission Control Protocol (TCP) intended to secure it against denial-of-service attacks, such as resource exhaustion by SYN flooding and malicious connection termination by third parties.

Cybercrime countermeasures

network abuse
Common forms of network attacks include Denial of Service (Dos) and Distributed Denial of Service(DDoS), Man-in-the-middle attack, packet sniffing, TCP SYN Flood, ICMP Flood, IP spoofing, and even simple web defacement.

Stream Control Transmission Protocol

SCTPStream Control Transmission Protocol (SCTP)
TCP is relatively vulnerable to denial-of-service attacks, such as SYN attacks.

Distributed.net

DNetC
Unfortunately, this initial effort had to be suspended as the result of SYN flood attacks by participants upon the server.

Blaster (computer worm)

BlasterBlaster wormJeffrey Lee Parson
The worm was programmed to start a SYN flood against port 80 of windowsupdate.com if the system date is after August 15 and before December 31st and after the 15th day of other months, thereby creating a distributed denial of service attack (DDoS) against the site.

Stacheldraht

Stacheldraht uses a number of different denial-of-service (DoS) attacks, including User Datagram Protocol (UDP) flood, Internet Control Message Protocol (ICMP) flood, Transmission Control Protocol (TCP) SYN flood and Smurf attack.

Recursive Internetwork Architecture

Had TCP incorporated Watson's results it would be more efficient, robust and secure, eliminating the use of SYNs and FINs and therefore all the associated complexities and vulnerabilities to attack (such as SYN flood).

Load balancing (computing)

load balancingload balancerload-balancing
Load balancers can provide features such as SYN cookies and delayed-binding (the back-end servers don't see the client until it finishes its TCP handshake) to mitigate SYN flood attacks and generally offload work from the servers to a more efficient platform.

Prolexic Technologies

In 2012, company said it had successfully stopped all DDoS attacks affecting its clients to date, including attacks against application servers, such as Layer 4 (SYN floods) and Layer 7 attacks, as well as HTTP GET flood attacks, zero-day attacks, UDP/ICMP floods, TCP flag abuses, DNS reflection, and DNS attacks.

Proxy server

proxyproxiesproxy servers
TCP Intercept is a traffic filtering security feature that protects TCP servers from TCP SYN flood attacks, which are a type of denial-of-service attack.

Windows Server 2003

Server 200320032003 Server
Other networking improvements include support for Wireless Provisioning Services, better IPv6 support, and new protections against SYN flood TCP attacks.

Zeek

BroBro Network Security MonitorBro NIDS
Other non-application layer analyzers include analyzers that detect host or port scans, intermediary hosts and syn-floods.