Not Perl, though this may be useful depending on your environment:
https://github.com/rus-cert/compress-cidr
The examples are for IPv6, though I use it to consolidate lists of IPv4 in a variety of jobs/scripts without issue. YMMV.
From: NANOG on behalf of John Von Essen
Sent: Thursday, October 1, 2020 6:32 AM
To: NANOG
Subject: CIDR cleanup
Sorry if this is slightly off-topic, but I am writing some code for a custom GeoDNS routemap. My starting data set is a raw list of /24 subnets, no prefix aggregation has been done. In other words, its the entire BGP routing table in /24 prefixes - tagged by Geo region. Each region is its own txt file with a dump of /24’s. As a result, these lists are HUGE. I want to aggregate the prefixes as much as possible to create a smaller routemap.
So right now it looks like:
...
105.170.72.0/24 brs
105.170.73.0/24 brs
105.170.74.0/24 brs
105.170.75.0/24 brs
105.170.76.0/24 brs
105.170.77.0/24 brs
105.170.78.0/24 brs
105.170.79.0/24 brs
105.170.80.0/24 brs
105.170.81.0/24 brs
105.170.82.0/24 brs
105.170.83.0/24 brs
105.170.84.0/24 brs
…
and so on. Obviously, 105.170.72.0/24 thru 105.170.79.0/24 can be aggregated to 105.170.72.0/21 and so on. I normally use Perl, does anyone now if there is a perl module that will automatically do this prefix aggregation? I tried to write my code to do this, and its not trivial, just lookinh for a shortcurt. I did a breif glance at some CIDR related Perl cpan modules, and nothing has jumped out.
Thanks
John
My old Test-Um Lanscaper died, and I was curious what people liked these days. Don’t need throughput testing or anything like that, just basic wire map testing, cable ID, cable length, PoE voltage, and DHCP client.
What do y’all like?
—Chris
