Skip to main content

TCP Control Block Interdependence

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Dr. Joseph D. Touch , Michael Welzl , Safiqul Islam
Last updated 2019-01-04
Replaces draft-welzl-tcpm-tcb-sharing
Replaced by RFC 9040
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-tcpm-2140bis
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This memo updates and replaces RFC 2140's description of interdependent TCP control blocks, in which part of the TCP state is shared among similar concurrent or consecutive connections. TCP state includes a combination of parameters, such as connection state, current round-trip time estimates, congestion control information, and process information. Most of this state is maintained on a per-connection basis in the TCP Control Block (TCB), but implementations can (and do) share certain TCB information across connections to the same host. Such sharing is intended to improve overall transient transport performance, while maintaining backward-compatibility with existing implementations. The sharing described herein is limited to only the TCB initialization and so has no effect on the long-term behavior of TCP after a connection has been established.


Dr. Joseph D. Touch
Michael Welzl
Safiqul Islam

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)