1. SCTP Team 2: Alexia Allaway Johnson Nguyen Nnamdi Nwajagu Scott Seo
Audrey Stanczak
Wade Whitten

2. What is SCTP SCTP stands for Stream Control Transfer Protocol
Transport Layer Protocol
Connection-oriented protocol that provides ordered transmission of messages
Messages do not have to be ordered if specified
SCTP provides multiple features to enhance reliability such as:
Multistreaming capabilities
Error Control
Congestion Control
Packet lifetime
Protection against DoS attacks

3. History of SCTP RFC 2960 – October 2000 RFC 3286 – May 2002
Purpose:
Introduced SCTP
Category:
Standards Track
Authors:
R. Stewart - Motorola
Q. Xie – Motorola
K. Morneault – Cisco Systems, Inc.
C. Sharp - Cisco Systems, Inc.
H. Schwarzbauer - Siemens
T. Taylor - Nortel Networks
I. Rytina - Ericsson
M. Kalla - Telcordia
L. Zhang - University of California, Los Angeles
V. Paxson - Amrita Center for Industrial Research and Innovation
RFC 3286 – May 2002
Purpose:
Updates RFC 2960 and provides an introduction to the high-level capabilities of SCTP as a protocol
Category:
Informational
Authors:
L. Ong - Ciena Corporation
J. Yoakum - Nortel Networks
RFC 3309 – September 2002
Updated error checking capabilities
Standards
J. Stone - Stanford University
R. Stewart - Cisco Systems, Inc.
D. Otis - SANlight
Wade

4. History of SCTP (cont) RFC 4460 – April 2006 Purpose: Informational
Provides errors and solutions to issues discovered through the use SCTP since its start
Category:
Informational
Authors:
R. Stewart - Cisco Systems, Inc.
I. Arias-Rodriguez - Nokia Research Center
K. Poon - Sun Microsystems, Inc.
A. Caro - BBN Technologies
M. Tuexen - Muenster University of Applied Sciences
RFC 4960 – September 2007
Purpose:
Obsoletes RFC 2960 and RFC 3309
Category:
Standards Track
Author:
R. Stewart – Cisco Systems, Inc.
Wade

5. How It Works To Establish Connection:
A client sends an Initiate signal to the server
Server responds with an Initiate Acknowledgement containing a state cookie
This cookie contains a Message Authentication Code, time stamp, and life span of the cookie
Client responds with a Cookie-Echo
After verifying authenticity, the server allocates resources for the association and responds with a Cookie Acknowledgement
The connection is now in the established state
The client sends a Shutdown signal to the server
Server responds with Shutdown Acknowledgement signal
Client responds with Shutdown-Complete signal
Abort signal may be used if any errors occur
To Terminate Connection:

6. SCTP Packet
Source Port: Identifies the port number of the transmitting device
Destination Port: Identifies the port number of the receiving device
Verification Tag: 32 bit number generated to distinguish packets apart from one another
Checksum: 32 bit CRC for error control
Chunk Type: 8 bits to identify the chunk
Chunk Flag: 8 flag bits that vary with chunk type
Chunk Length: 16 bit unsigned value to specify chunk length
Chunk Data: Data to be sent
Padded with 0s if not a size multiple of 4

7. TCP vs. SCTP
Like TCP, SCTP manages "reliable transport" (ensuring the complete arrival of data units that are sent over the network) over the Internet's Internet Protocol (IP), the protocol responsible for moving the data but not for managing whether all the data arrives. 
Unlike TCP, SCTP ensures the complete concurrent transmission of several streams of data between connected end points. 
SCTP also supports multihoming, which means that a connected end point can have alternate IP addresses associated with it in order to route around network failure or changing conditions.

8. Features of SCTP Message-Oriented
Ensures in-sequence transportation of messages
With congestion control
Has the reliability of TCP while being message-driven like UDP
Does not allow half-closed connections

9. Steaming Capabilities
SCTP, TCP, and UDP
TCP Transmission Control Protocol
UDP User Datagram Protocol
SCTP
Stream Transmission Control Protocol
Layer Protocol
Transport Layer Protocol
Connection Type
Connection-Oriented
Connectionless
Transmission
Stream-Oriented
Message-Oriented
Addressing 
Unicast
Multicast 
Error Control
16 bit Check Sum
None
32 bit CRC
Steaming Capabilities
Single Stream
 Single Stream
Multistreaming
Flow Control
Yes No
Congestion Control
Fault Tolerance
Data Delivery
Strictly Ordered
Unordered
Partially Ordered
Security
Improved
Wade

10. https://searchnetworking.techtarget.com/definition/SCTP
References
lnxw07SCTPhttps://f5.com/resources/white-papers/introduction-to-the-stream-control-transmission-protocol
protocol-understanding.html
protocol--sctp--.html