README file for version 0.2.2 of alias_sctp, ipfw sctp NAT support


SUMMARY

  Alias_sctp provides SCTP NAT functionality to the
  ipfw/ipfw_nat/libalias suite. The code has been intentionally kept
  as separate as possible from the base modules to aid testing and
  debugging, and make it easier to port to other systems.


alias_sctp_0.2.x_patch8.x.tar.gz contains:
   README.txt
   INSTALL.txt
   COPYING.txt
   TODO.txt
   alias_sctp_0.2.x_patch8.x


CONTENTS OF PATCH

  This release is a patch for FreeBSD 8.x (r185303) to enable support
  for NAT of SCTP packets using the ipfw/libalias framework

  New files in sys/netinet/libalias :
    alias_sctp.h
    alias_sctp.c

  Modified files in sys/netinet/libalias:
    alias.c
    alias.h
    alias_db.c
    alias_local.h

  Modified files in sys/netinet:
    ip_fw_nat.c

  Modified files in sys/modules/libalias/libalias:
    Makefile

  Modified files in sbin/ipfw:
    Makefile
    ipfw2.c

  New and Modified files in share/man/man8:
    alias_sctp.8
    Makefile


IMPLEMENTATION NOTE:
  
  Alias_sctp implements features proposed in Internet draft
  draft-stewart-behave-sctpnat-04, R. Stewart and M. Tuexen, "Stream control
  transmission protocol (SCTP) network address translation," Jul. 2008. The new
  ASCONF vtag parameter specification is a little ambiguous. We have interpreted
  it as follows (function GetAsconfVtags):
 
     1. The first vtag is the tag that this host expects to be on packets it
        receives.
           
     2. The second vtag matches the SCTP header's vtag

  Up to the release of alias_sctp 0.2, the FreeBSD stack had not implemented
  these changes.

  
DOCUMENTATION

  Documentation, papers, technical reports, and talks can be found on the
  project web site: http://caia.swin.edu.au/urp/sonata/
  

LICENSING
  
  Released under a BSD type license. See COPYING.txt for details.



ACKNOWLEDGEMENT

  This software was developed by David A. Hayes and Jason But.
 
  Development is part of the CAIA SONATA project, proposed by Jason
  But and Grenville Armitage: http://caia.swin.edu.au/urp/sonata/
 
  This project has been made possible in part by a grant from the
  Cisco University Research Program Fund at Community Foundation
  Silicon Valley.