Skip to main content

Route summarization script

I've been searching the internet for a script/program that can automatically summarize CIDR classes that I pass to it. I haven't found one, but I found a perl module (Net::CIDR::Lite) that does just this.

I wrote a small script that takes the CIDR classes and summarizes them and then outputs the summarized classes. This is useful for generating a routing table for a management server and basically you have to copy the classes from a router, summarize them and paste them on the server.

Here's the script - copy/paste it in a perl file and make it executable:


#!/usr/bin/perl
use strict;
use warnings;
use Net::CIDR::Lite;

my $ipv4String='[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}';

if(defined $ARGV[0] && $ARGV[0] eq '-h'){
print "usage: $0

This script summarizes your IP classes (if possible). Input IPs with mask one per line. End with CTRL+D. Optionally, redirect a file to stdin like so:
$0 < cidr.txt ";
exit;
}


print "Enter IP/Mask one per line (1.2.3.0/24). End with CTRL+D.\n";

my $cidr =Net::CIDR::Lite->new;

while(<>){
if(/($ipv4String\/[0-9]{1,2})/){
my $item=$1;
$cidr->add($item);
}
else{
print "Ignoring previous line.\n";
}
}
my @cidr_list = $cidr->list;
print "======Aggregated IP list:======\n";
foreach my $item(@cidr_list){
print "$item\n";
}


Here's how to run the script:

root@panopticon variousScripts]# ./aggregateCIDR.pl
Enter IP/Mask one per line (1.2.3.0/24). End with CTRL+D.
1.1.1.0/24
1.1.2.0/24
1.1.4.0/24
1.1.3.0/24
1.1.0.0/24
1.1.1.128/25
======Aggregated IP list:======
1.1.0.0/22
1.1.4.0/24
[root@panopticon variousScripts]# ./aggregateCIDR.pl

The script requires Net::CIDR::Lite. If you get an error message, you need to install this module:

[root@panopticon variousScripts]# ./aggregateCIDR.pl
Can't locate Net/CIDR/Lite.pm in @INC (@INC contains: /usr/lib64/perl5/5.8.5/x86_64-linux-thread-multi /usr/lib/perl5/5.8.5 /usr/lib64/perl5/site_perl/5.8.5/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.4/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.3/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.2/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.1/x86_64-linux-thread-multi /usr/lib64/perl5/site_perl/5.8.0/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl/5.8.4 /usr/lib/perl5/site_perl/5.8.3 /usr/lib/perl5/site_perl/5.8.2 /usr/lib/perl5/site_perl/5.8.1 /usr/lib/perl5/site_perl/5.8.0 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.5/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.4/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.3/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.2/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.1/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.8.0/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl/5.8.4 /usr/lib/perl5/vendor_perl/5.8.3 /usr/lib/perl5/vendor_perl/5.8.2 /usr/lib/perl5/vendor_perl/5.8.1 /usr/lib/perl5/vendor_perl/5.8.0 /usr/lib/perl5/vendor_perl .) at ./aggregateCIDR.pl line 4.
BEGIN failed--compilation aborted at ./aggregateCIDR.pl line 4.
[root@panopticon variousScripts]# perl -MCPAN -e 'install Net::CIDR::Lite;'
CPAN: Storable loaded ok
Going to read /home/adrianp/.cpan/Metadata
Database was generated on Mon, 03 Sep 2007 07:37:38 GMT
...
Labels:

Comments

Post a Comment

Popular posts from this blog

Home Assistant + Android TV = fun

Here's a quick setup guide for controlling your Android TV from within Home Assistant. I've used it to control a genuine Android TV (Philips 7304) and an Odroid N2 running Android TV. For this to work you need ADB access. It can usually be enabled from within Developer Settings. The great part is - you don't need root access! The most important things are described in the androidtv component for Home Assistant: https://www.home-assistant.io/integrations/androidtv/ Make sure you go through the adb setup. My configuration is simple (inside configuration.yaml): media_player:   - platform: androidtv     name: TV Bedroom ATV     host: 192.168.1.61     device_class: androidtv Once Home Assistant restarts, your TV might require you to accept the connection (adb authentication). This happens only once (or until you reset your ATV to factory settings). Once running the integration will show you the current ATV state (on or off) and al...
5 comments
Read more

SmokePing + InfluxDB export + docker + slaves + Grafana = fun

I've been working for a while on this project - with the purpose of getting SmokePing measurements from different hosts (slaves) into InfluxDB so that we can better graph them with Grafana. The slaves run multiple Smokeping instances inside Docker so that they have separate networking (measure through different uplinks, independently). This will not be a comprehensive configuration guide, but a quick "how to" to handle setup and basic troubleshooting. It assumes you already know how to set up and operate a regular Smokeping install with or without slaves and that you are fluent in Smokeping configuration syntax, know your way around Docker and aren't a stranger from InfluxDB and Grafana (sorry, there's a lot of information to take in). 1. Getting Smokeping with InfluxDB support - you can get it either from the official page (most changes have been merged) - https://github.com/oetiker/SmokePing (PR discussion here: https://github.com/oetiker/SmokePing/issues/...
16 comments
Read more

Installing Home Assistant Supervised on an old 32bit HP laptop

 I've received a challenge from my former boss: an old HP laptop that was born in 2005:  an HP-Compaq NC6220 ( https://www.pocket-lint.com/laptops/reviews/hp/68181-hp-compaq-nc6220-notebook-laptop/ ). The specs are abysmal: So, i386, 1.7GHz single-core CPU (remember those?), 1G of DDR2 RAM (2x512M) and a 40GB ATA (not SATA!) drive. But hey, at least it has a serial port!  The challenge is to install HomeAssistant ( https://www.home-assistant.io/ ) on it so that he can monitor some Zigbee temperature sensors and relays (via a gateway). The first hurdle was to remove the BIOS password - following this nice guide: https://www.youtube.com/watch?v=ZaGKyb0ntSg Next-up - install HASSOS. Unfortunately, it doesn't support i386, but only x86_64... So, I went the Home Assistant Supervised route, and installed Debian 11 i386 edition from a netinstall USB ( https://cdimage.debian.org/debian-cd/current/i386/iso-cd/debian-11.6.0-i386-netinst.iso ).   Once Debian was up and run...
Post a Comment
Read more