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Test for overlapping IP ranges

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Old 04-11-2012
Question Test for overlapping IP ranges
Greetings folks,

I have a rather lengthy list of banned IP ranges in iptables. Initially it was constructed as a rather ad-hoc affair, then later I discovered a site which had IP Block By Country lists, and imported several into iptables.

If possible, I'd like to be able to verify if the list contains overlapping IP ranges (it almost inevitably must I'd think) but it's become h.u.g.e. and doing it manually is probably close to impossible.

Can anyone recommend a tool which can do this? A command line tool or Win32 -no preference - either is fine. Substantial Googling on this has, thus far, turned up nothing.

Regards & TIA,

putter
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LEARN ABOUT DEBIAN

arno-iptables-firewall

ARNO-IPTABLES-FIREWALL(8)												 ARNO-IPTABLES-FIREWALL(8)

NAME

       arno-iptables-firewall - Single- & multi-homed firewall script with DSL/ADSL support.

SYNOPSIS

       /etc/init.d/arno-iptables-firewall [start|stop|status|force-reload|restart]

DESCRIPTION

       arno-iptables-firewall  is  an  iptables configuration script with support for both IPv4 & IPv6.  While it is extremely easy to use one can
       nevertheless use it in quite complicated environments.

       All available options are explained in the extensively documented configuration file.

       The external interface of the system needs to be set up properly in the firewalls configuration file (EXT_IF).  The default behavior of the
       firewall is to deny all incoming connections.

       For  additional	requirements not covered by the configuration file custom iptables rules can be placed in /etc/arno-iptables-firewall/cus-
       tom-rules.  This file is automatically parsed by the service script.

       See the README file (eg. in /usr/(local/)share/doc/arno-iptables-firewall) for an example how to manage logging of firewall events  through
       syslogd.

       The arno-fwfilter script can be used to make the firewall logs more readable for humans (see manpage).

       Several plugins for the firewall script are available online. Plugins can be downloaded from http://rocky.eld.leidenuniv.nl/ Please see the
       README file for more information.

FILES

       /etc/init.d/arno-iptables-firewall	       system service script
       /etc/arno-iptables-firewall/firewall.conf       firewall configuration
       /etc/arno-iptables-firewall/conf.d/	       firewall configuration directory
       /etc/arno-iptables-firewall/custom-rules        custom iptables rules
       /etc/arno-iptables-firewall/blocked-hosts       host blacklist
       /etc/arno-iptables-firewall/mac-addresses       mac filter list

       Please note, that the last two files do exist in the initial configuration and their use is disabled  in  /etc/arno-iptables-firewall/fire-
       wall.conf

SEE ALSO

       iptables(8), arno-fwfilter(1), syslog.conf(5)

       The http://rocky.eld.leidenuniv.nl/ web site.

AUTHOR

       arno-iptables-firewall was written by Arno van Amersfoort <arnova@rocky.eld.leidenuniv.nl>.

       This manual page was written by Michael Hanke <michael.hanke@gmail.com>, for the Debian project (but may be used by others).

Michael Hanke							  March 14, 2012					 ARNO-IPTABLES-FIREWALL(8)