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mod_cc(4)

The modular congestion control framework allows the TCP implemen‐
tation  to  dynamically  change  the congestion control algorithm
used by new and existing connections.  Algorithms are  identified
by  a  unique  name.   Algorithm modules can be compiled into the
kernel or loaded as kernel modules using the facility.   The  de‐
fault  algorithm  is NewReno, and all connections use the default
unless explicitly overridden using the socket option (see for de‐
tails).  The default can be changed using a MIB variable detailed
in the section below.  Algorithm specific parameters can  be  set
or  queried  using  the socket option (see for details).  Callers
must pass a pointer to an algorithm specific  data,  and  specify
its  size.   The framework exposes the following variables in the
branch of the MIB: Read-only list of currently available  conges‐
tion  control  algorithms  by  name.  Returns the current default
congestion control algorithm when read, and changes  the  default
when  set.  When attempting to change the default algorithm, this
variable should be set to one of the  names  listed  by  the  MIB
variable.  Enable support for draft-ietf-tcpm-alternativebackoff-
ecn,  which alters the window decrease factor applied to the con‐
gestion window in response to an ECN congestion signal.  Refer to
individual congestion control man pages to determine if they  im‐
plement  support  for ABE and for configuration details.  If non-
zero, apply standard beta instead  of  ABE-beta  during  ECN-sig‐
nalled  congestion recovery episodes if loss also needs to be re‐
paired.  Development and testing of this software were made  pos‐
sible  in  part  by  grants from the FreeBSD Foundation and Cisco
University Research Program Fund at Community Foundation  Silicon
Valley.   The modular congestion control framework first appeared
in The framework was first released in 2007 by  James  Healy  and
Lawrence Stewart whilst working on the NewTCP research project at
Swinburne University of Technology's Centre for Advanced Internet
Architectures,  Melbourne,  Australia, which was made possible in
part by a grant from the Cisco University Research  Program  Fund
at  Community Foundation Silicon Valley.  More details are avail‐
able at:  http://caia.swin.edu.au/urp/newtcp/  The  facility  was
written by and This manual page was written by and






























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