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Inferring TCP Behavior Notes


  • stability and fairness of the internet relies on the use of congestion control mechanisms
    • refers to the congestion collapse in the 80s
    • bandwidth - describes the maximum data transfer amount over a certain time
  • [TBIT can] detect bugs and non-compliance in TCP implementations deployed in public web servers


  • Understanding TCP behavior can be important for Internet-related research, ISPs, OS Vendors and application developers.
  • [web servers were chosen to test TCP behavior because] web servers will respond to a request for information without requiring any special privileges
  • TBIT shows that newer TCP variants such as NewReno and SACK are widely deployed in the Internet
  • TCP initial window used at a web server can not necessarily be inferred simply by knowing the operating system used at that server
  • useful not only in simulations and modeling, but also in standards-body decisions to advance documents specifying larger values for initial windows
  • ability to publically identify end hosts not conforming to end-to-end congestion control can help significantly in reinforcing the use of end-to-end congestion control in the Internet
  • TBIT...identifies these failure modes and the extent of their deployment in the Internet, to identify the responsible vendors, and to track the progress (or lack of progress)
  • TCP behavior determined by equipment on the path to the server
  • [tests of ECN are] testing for the presence of firewalls and load balancers that block access to servers from hosts attempting to negotiate ECN
  • interested in understanding the congestion control behavior in the Internet and not just the congestion control of the web server boxes


  • {black text} mean quotes from the paper that are important to note
  • {blue text} means notes or annotations about the text
-- HelenFemmel - 2015-07-31
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Topic revision: r1 - 2015-07-31 - HelenFemmel
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