nanog mailing list archives
Re: CIDR Utilization
From: Baldur Norddahl <baldur.norddahl () gmail com>
Date: Sun, 1 Nov 2015 00:01:52 +0100
On 31 October 2015 at 01:51, John Steve Nash <john.steve.nash () gmail com> wrote:
I'm looking for any tool or a way I could specify a CIDR and the prefixes that are being used within this CIDR and the tool show me all free supernets.
For the weekend exercise I wrote a small script that does this. You can find it at http://pastebin.com/i0D54Lsq Usage: cat input.txt | ./subnet.sh The input.txt file contains your input such as: Baldurs-MBP-2:~ baldur$ cat /tmp/x add 192.168.0.0/24 remove 192.168.0.1/32 remove 192.168.0.8/27 remove 192.168.0.64/26 remove 192.168.0.68/32 remove 192.168.0.96/29 Baldurs-MBP-2:~ baldur$ cat /tmp/x | ./subnet.sh 192.168.0.32/27 192.168.0.128/25 Note this was not your expected output, but that is because your example is defective. To get your expected output we can modify the input such as: Baldurs-MBP-2:~ baldur$ cat /tmp/x add 192.168.0.0/24 remove 192.168.0.0/31 remove 192.168.0.3/32 remove 192.168.0.8/29 remove 192.168.0.16/28 remove 192.168.0.64/26 remove 192.168.0.68/32 remove 192.168.0.96/29 Baldurs-MBP-2:~ baldur$ cat /tmp/x | ./subnet.sh 192.168.0.2/32 192.168.0.4/30 192.168.0.32/27 192.168.0.128/25 You can have multiple add lines and add/remove lines in any order. Regards, Baldur
Current thread:
- CIDR Utilization John Steve Nash (Oct 30)
- Re: CIDR Utilization joel jaeggli (Oct 30)
- Re: CIDR Utilization Theodore Baschak (Oct 30)
- RE: CIDR Utilization Jeremiah Millay (Oct 31)
- Re: CIDR Utilization inetjunkmail (Oct 31)
- Re: CIDR Utilization Baldur Norddahl (Oct 31)