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Full Discussion: Is there any way to add an exception for a port in the firewall setting, permanently?
Special Forums IP Networking Is there any way to add an exception for a port in the firewall setting, permanently? Post 302399975 by senrooy on Tuesday 2nd of March 2010 03:56:49 AM
Old 03-02-2010
Is there any way to add an exception for a port in the firewall setting, permanently?
Hello,

I want to add a port in the firewall exception list so that my application can be accessed over network even if firewall is disabled. I am using iptables command to add exception.

The problem is, after setting the rule if I change the firewall setting i.e. on/off then it is overwriting all the existing rules.

Let me give you two scenarios to help you understand the problem better:
Scenario 1) Firewall is On. I have added a rule in the iptables to allow an input access to a particular port. Now my (Web based) application can be accessed from other systems over the network. Now I disable the firewall. Still my app can be accessed over network but the rule is gone.

Scenario 2) Firewall is Off. I have added a rule in the iptables to allow an input access to a particular port. Now my (Web based) application can be accessed from other systems over the network. I enable the firewall. Now the app cannot be accessed over network because all the existing rules have been overwritten.

Is there any way to add an exception for a particular port in the firewall setting so that disabling or enabling the firewall (any number of times) won't affect the existing rule set.

Note: I can only use 'commands'. Doing changes using graphical interface won't be helpful in my case as I am using a script to install my app and configure the port settings.
 

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LEARN ABOUT DEBIAN

apf

APF(1)							      General Commands Manual							    APF(1)

NAME

       apf - easy iptables based firewall system

SYNOPSIS

       apf

DESCRIPTION

       This  manual page documents briefly the apf command.  This manual page was written for the Debian distribution because the original program
       does not have a manual page.

       Advanced Policy Firewall (APF) is an iptables (netfilter) based firewall system designed around the essential  needs  of  today's  Internet
       deployed  servers  and the unique needs of custom deployed Linux installations. The configuration of APF is designed to be very informative
       and present the user with an easy to follow process, from top to bottom of the configuration file. The management of APF  on  a	day-to-day
       basis  is  conducted from the command line with the 'apf' command, which includes detailed usage information and all the features one would
       expect from a current and forward thinking firewall solution.

OPTIONS

       apf follow the usual GNU command line syntax, with long options starting with two dashes (`-').	A summary of options is included below.

       -s|--start
	      load all firewall rules

       -r|--restart
	      stop (flush) & reload firewall rules

       -l|--list
	      list all firewall rules

       -t|--status
	      output firewall status log

       -e|--refresh
	      refresh & resolve dns names in trust rules

       -a <HOST CMT|--allow <HOST COMMENT>
	      add host (IP/FQDN) to allow_hosts.rules and immediately load new rule into firewall

       -d <HOST CMT|--deny <HOST COMMENT>
	      add host (IP/FQDN) to deny_hosts.rules and immediately load new rule into firewall

       -u <HOST>|--remove <HOST>
	      remove host from [glob]*_hosts.rules and immediately remove rule from firewall

       -o|--ovars
	      output all configuration options

COPYRIGHT

       Copyright (C) 1999-2007, R-fx Networks <proj@r-fx.org>
       Copyright (C) 2007, Ryan MacDonald <ryan@r-fx.org> This program may be freely redistributed under the terms of the GNU GPL

       This manual page was written by Giuseppe Iuculano <giuseppe@iuculano.it>, for the Debian project (but may be used by others).

								  August 17, 2008							    APF(1)
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