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Full Discussion: Editing rules on iptables
Special Forums Cybersecurity Editing rules on iptables Post 302526633 by pludi on Wednesday 1st of June 2011 05:17:54 AM
Old 06-01-2011
Quote:
Originally Posted by garric
I want to open specific ports at the output and block the rest. Putting the default output blocking policy would make the machine unusable. Thus, I shifted it to the bottom the firewall script and that worked. Anything I am doing wrong here?
The default policy takes immediate effect when set, that's true. However, it only blocks you out if you enter the commands manually, which should be the exception, not the rule. When using a script you can set the default policy first, and then open the ports you need without interrupting any traffic.
 

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LEARN ABOUT DEBIAN

postfix-add-policy

POSTFIX-ADD-POLICY(8)					      System Manager's Manual					     POSTFIX-ADD-POLICY(8)

NAME

       postfix-add-policy - add policy service to Postfix master.cf

SYNOPSIS

       postfix-add-policy [policy name...] [username...] [argv...]

DESCRIPTION

       The  postfix-add-policy(8)  command  adds  an  smtp  policy server named policy name running using username and called as argv to etc/post-
       fix/master.cf to facilitate integration of SMTP policy servers such as postgrey or postfix-policyd-spf-perl.  The configuration is based on
       the Postfix SMTPD_POLICY_README.  Adminstrators should verify it is appropriate for their requirements.

       The original file is copied prior to modification and left in /etc/postfix to make it possible to revert changes easily.

       Available in the Debian package for Postfix version 2.5.3 and later.

DIAGNOSTICS

       If the given policy name  already appears in the master.cf, a message will be printed to standard out and master.cf will not be modified.

ENVIRONMENT

       MAIL_CONFIG
	      Directory with Postfix configuration files.

	      The  postfix-add-policy(8)  command  should  use	this, but it currently doesn't.  It is hard coded to /etc/postfix.  This should be
	      changed.

CONFIGURATION PARAMETERS

       None

FILES

       /etc/postfix/master.cf

SEE ALSO

       postconf(5), Postfix configuration

LICENSE

       This software is licensed under the MIT open source license.

AUTHOR(S)
       Scott Kitterman
       <scott@kitterman.com>

															     POSTFIX-ADD-POLICY(8)
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