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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

fwb_iosacl

fwb_pix(1)							 Firewall Builder							fwb_pix(1)

NAME

       fwb_ipt - Policy compiler for Cisco IOS ACL

SYNOPSIS

       fwb_iosacl [-vV] [-d wdir] [-4] [-6] [-i] -f data_file.xml object_name

DESCRIPTION

       fwb_iosacl  is  firewall  policy compiler component of Firewall Builder (see fwbuilder(1)). Compiler reads objects definitions and firewall
       description from the data file specified with "-f" option and generates resultant Cisco IOS ACL configuration file.  The  configuration	is
       written	to  the  file  with the name the same as the name of the firewall object, plus extension ".fw". Compiler generates extended access
       lists for Cisco routers running IOS v12.x using "ip access-list <name>" syntax. Compiler  also  generates  "ip  access-group"  commands	to
       assign  access  lists  to interfaces. Generated ACL configuration can be uploaded to the router manually or using built-in installer in the
       fwbuilder(1) GUI.

       The data file and the name of the firewall objects must be specified on the command line. Other command line parameters are optional.

OPTIONS

       -4     Generate iptables script for IPv4 part of the policy. If any rules of the firewall refer to IPv6 addresses, compiler will skip these
	      rules.   Options	"-4"  and  "-6"  are  exclusive.  If  neither option is used, compiler tries to generate both parts of the script,
	      although generation of the IPv6 part is controlled by the option "Enable IPv6 support" in the "IPv6"  tab  of  the  firewall  object
	      advanced settings dialog.  This option is off by default.

       -6     Generate iptables script for IPv6 part of the policy. If any rules of the firewall refer to IPv6 addresses, compiler will skip these
	      rules.

       -f FILE
	      Specify the name of the data file to be processed.

       -d wdir
	      Specify working directory. Compiler creates file with ACL configuration in this directory.  If this parameter is missing, then  gen-
	      erated ACL will be placed in the current working directory.

       -v     Be verbose: compiler prints diagnostic messages when it works.

       -V     Print version number and quit.

       -i     When this option is present, the last argument on the command line is supposed to be firewall object ID rather than its name

URL

       Firewall Builder home page is located at the following URL: http://www.fwbuilder.org/

BUGS

       Please report bugs using bug tracking system on SourceForge:

       http://sourceforge.net/tracker/?group_id=5314&atid=105314

SEE ALSO

       fwbuilder(1), fwb_pix(1), fwb_ipfw(1), fwb_ipf(1), fwb_ipt(1) fwb_pf(1)

FWB
																	fwb_pix(1)
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