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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

ipkungfu

ipkungfu(8)						      System Manager's Manual						       ipkungfu(8)

NAME

       ipkungfu - An iptables-based firewall for Linux

SYNOPSIS

       ipkungfu [ -c ] [ -t ] [ -d ] [ -h ] [ -v ] [ --quiet ] [ --panic ] [ --no-caching

DESCRIPTION

       ipkungfu  is an iptables-based Linux firewall. The primary design goals are security, ease of use, and performance, in that order. It takes
       advantage of advanced features of iptables, tcpwrappers, and the Linux kernel. It also simplifies the configuration of internet	connection
       sharing, advanced routing, and other networking needs.

OPTIONS

       -c  (or	--check)
		   Check whether ipkungfu is loaded, and report any command line options it may have been loaded with.

       -t  (or	--test)
		   Runs  a configuration test, and displays the results.  Note that this does not test or display all configuration options.  This
		   gives you an opportunity to verify that major configuration options are correct before putting them into action.

       -d  (or	--disable)
		   Disables the firewall.  It is important to know exactly what this option does.  All traffic is allowed in and out, and  in  the
		   case  of  a gateway, all NATed traffic is forwarded (the option retains your connection sharing options).  Custom rules are not
		   implemented, and deny_hosts.conf is ignored.

       -f  (or	--flush)
		   Disables the firewall COMPLETELY.  All rules are flushed, all chains are removed.  Any port forwarding or  internet	connection
		   sharing will cease to work.

       -h  (or	--help)
		   Displays brief usage information and exits.

       -v  (or	--version)
		   Displays version information and exits.

       --quiet	   Runs ipkungfu with no standard output

       --panic	   Drops  ALL traffic in all directions on all network interfaces.  You should probably never use this option.	The --panic option
		   is available for the highly unusual situation where you know that an attack is underway but you know of no other  way  to  stop
		   it.

       --failsafe  If  ipkungfu fails, --failsafe will cause all firewall policies to revert to ACCEPT.  This is useful when working with ipkungfu
		   remotely, to prevent loss of remote access due to firewall failure.

       --no-caching
		   Disables rules caching feature.

FILES

       /etc/ipkungfu/ipkungfu.conf
       /etc/ipkungfu/advanced.conf
       /etc/ipkungfu/accept_hosts.conf
       /etc/ipkungfu/deny_hosts.conf
       /etc/ipkungfu/custom.conf
       /etc/ipkungfu/log.conf
       /etc/ipkungfu/redirect.conf
       /etc/ipkungfu/services.conf
       /usr/sbin/ipkungfu
       /usr/share/doc/ipkungfu/AUTHORS
       /usr/share/doc/ipkungfu/README
       /usr/share/doc/ipkungfu/FAQ
       /usr/share/doc/ipkungfu/ChangeLog
       /usr/share/doc/ipkungfu/COPYING

SEE ALSO

       iptables(8).

								   January 2003 						       ipkungfu(8)
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