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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IPTABLES-SAVE(8)						  iptables 1.6.1						  IPTABLES-SAVE(8)

NAME
iptables-save -- dump iptables rules to stdout ip6tables-save -- dump iptables rules to stdout SYNOPSIS
iptables-save [-M modprobe] [-c] [-t table] ip6tables-save [-M modprobe] [-c] [-t table] DESCRIPTION
iptables-save and ip6tables-save are used to dump the contents of IP or IPv6 Table in easily parseable format to STDOUT. Use I/O-redirect- ion provided by your shell to write to a file. -M, --modprobe modprobe_program Specify the path to the modprobe program. By default, iptables-save will inspect /proc/sys/kernel/modprobe to determine the exe- cutable's path. -c, --counters include the current values of all packet and byte counters in the output -t, --table tablename restrict output to only one table. If not specified, output includes all available tables. BUGS
None known as of iptables-1.2.1 release AUTHORS
Harald Welte <laforge@gnumonks.org> Rusty Russell <rusty@rustcorp.com.au> Andras Kis-Szabo <kisza@sch.bme.hu> contributed ip6tables-save. SEE ALSO
iptables-apply(8),iptables-restore(8), iptables(8) The iptables-HOWTO, which details more iptables usage, the NAT-HOWTO, which details NAT, and the netfilter-hacking-HOWTO which details the internals. iptables 1.6.1 IPTABLES-SAVE(8)