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Tag: User Datagram Protocol (UDP)

The User Datagram Protocol (UDP) is one of the core members of the Internet protocol suite. The protocol was designed by David P. Reed in 1980 and formally defined in RFC 768.

UDP uses a simple connectionless transmission model with a minimum of protocol mechanism. It has no handshaking dialogues, and thus exposes the user’s program to any unreliability of the underlying network protocol. There is no guarantee of delivery, ordering, or duplicate protection. UDP provides checksums for data integrity, and port numbers for addressing different functions at the source and destination of the datagram.

With UDP, computer applications can send messages, in this case referred to as datagrams, to other hosts on an Internet Protocol (IP) network without prior communications to set up special transmission channels or data paths. UDP is suitable for purposes where error checking and correction is either not necessary or is performed in the application, avoiding the overhead of such processing at the network interface level. Time-sensitive applications often use UDP because dropping packets is preferable to waiting for delayed packets, which may not be an option in a real-time system. If error correction facilities are needed at the network interface level, an application may use the Transmission Control Protocol (TCP) or Stream Control Transmission Protocol (SCTP) which are designed for this purpose.

GitHub reports its site was unavailable this week when attackers leveraged Memcached servers to generate large, widespread UDP attacks.
Over the past few days researchers say DDoS attacks have been using memcached servers to amplify DDoS attacks using UDP-based packets.
Using memcached? Get it behind the firewall and turn off UDP if you want to live Attackers have discovered a new amplified denial-of-service attack vector, and have launched attacks reaching hundreds of gigabits per second in Asia, North America and Eu...
Multiple vendors this week say they have seen a recent spike in UDP attacks coming in via port 11211.