NW engineer tried to aggregate addresses with python netaddr

Premise

This article is written by a network engineer who is not good at programming. A guide for address aggregation and sorting without understanding how to use python. It is built in the following environment, but the command is exactly the same when built on Linux

Windows10 64bit Anaconda3 https://www.python.jp/install/anaconda/windows/install.html

Preparation

netaddr installation

Launch Anaconda Prompt > pip install netaddr

netaddr installation (local material)

Download the material (wheel) at the following site https://pypi.org/ Material: netaddr-0.7.19-py2.py3-none-any.whl (1.6 MB)

Start Anaconda Prompt and move to the location where the materials are stored > cd downloads Install by specifying the file name > pip install netaddr-0.7.19-py2.py3-none-any.whl

How to use

1. Address aggregation

> python >>> from netaddr import * >>> ip_list = [ IPNetwork('192.168.1.0/24'), IPNetwork('192.168.0.0/24'), IPNetwork('10.20.30.0/24'), IPNetwork('10.0.0.0/8') ] >>> cidr_merge(ip_list)

output

[IPNetwork('10.0.0.0/8'), IPNetwork('192.168.0.0/23')]

2. Address sorting (ascending order)

> python >>> from netaddr import * >>> import random >>> import pprint >>> ip_list = [ IPNetwork('192.168.1.0/24'), IPNetwork('192.168.0.0/24'), IPNetwork('10.20.30.0/24'), IPNetwork('10.0.0.0/8') ] >>> random.shuffle(ip_list) >>> ip_list.sort() >>> pprint.pprint(ip_list)

output

[IPNetwork('10.0.0.0/8'), IPNetwork('10.20.30.0/24'), IPNetwork('192.168.0.0/24'), IPNetwork('192.168.1.0/24')]

If the output is less than 3, it will be displayed in one line.

3.mask → prefix > python >>> from netaddr import * >>> ip_list = [ IPNetwork('192.168.24.0/255.255.255.0'), IPNetwork('192.168.24.0/255.255.255.128'), IPNetwork('192.168.24.0/255.255.255.192'), IPNetwork('192.168.24.252/30') ] >>> for i in ip_list: ... print(i) ... (enter)

Indent with a half-width space in the for sentence

output

192.168.24.0/24 192.168.24.0/25 192.168.24.0/26 192.168.24.252/30

4.prefix → mask > python >>> from netaddr import * >>> ip_list = [ IPNetwork('192.168.24.0/255.255.255.0'), IPNetwork('192.168.24.0/255.255.255.128'), IPNetwork('192.168.24.0/255.255.255.192'), IPNetwork('192.168.24.252/30') ] >>> for i in ip_list: ... print(str(i.ip)+'/'+str(i.netmask)) ... (enter)

Indent with a half-width space in the for sentence

output

192.168.24.0/255.255.255.0 192.168.24.0/255.255.255.128 192.168.24.0/255.255.255.192 192.168.24.252/255.255.255.252

reference

https://netaddr.readthedocs.io/en/latest/index.html