iptables-apply - a safer way to update iptables remotely


   iptables-apply   [-hV]   [-t  timeout]  [-w  savefile]  {[rulesfile]|-c


   iptables-apply will  try  to  apply  a  new  rulesfile  (as  output  by
   iptables-save,  read by iptables-restore) or run a command to configure
   iptables and then prompt the user whether the changes are okay. If  the
   new  iptables  rules  cut the existing connection, the user will not be
   able to answer affirmatively. In this case, the script  rolls  back  to
   the previous working iptables rules after the timeout expires.

   Successfully  applied  rules  can also be written to savefile and later
   used to roll back to this state. This can be used to implement a  store
   last  good  configuration mechanism when experimenting with an iptables
   setup  script:  iptables-apply  -w  /etc/network/iptables.up.rules   -c

   When    called    as    ip6tables-apply,    the    script    will   use
   ip6tables-save/-restore and IPv6 default values instead. Default  value
   for rulesfile is '/etc/network/iptables.up.rules'.


   -t seconds, --timeout seconds
          Sets  the  timeout  in  seconds after which the script will roll
          back to the previous ruleset (default: 10).

   -w savefile, --write savefile
          Specify the savefile where successfully applied  rules  will  be
          written    to    (default    if    empty    string   is   given:

   -c runcmd, --command runcmd
          Run command runcmd to configure iptables instead of  applying  a
          rulesfile (default: /etc/network/iptables.up.run).

   -h, --help
          Display usage information.

   -V, --version
          Display version information.


   iptables-restore(8), iptables-save(8), iptables(8).


   Original   iptables-apply   -   Copyright   2006   Martin   F.   Krafft
   <madduck@madduck.net>.    Version   1.1    -    Copyright    2010    GW
   <gw.2010@tnode.com or http://gw.tnode.com/>.

   This  manual page was written by Martin F. Krafft <madduck@madduck.net>
   and extended by GW <gw.2010@tnode.com or http://gw.tnode.com/>.

   Permission is granted to copy, distribute and/or modify  this  document
   under the terms of the Artistic License 2.0.


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.