Network Security Groups – Getting a overview

I was working with Network Security Groups (NSG) earlier this week. The environment included multiple VNET, subnets, NSG and association on both VMs and Subnets. It quick became complicated to keep track of what has been configured, associations and NSG rules. Therefor I created a PowerShell script that generates a HTML based report that gives me an overview. I thought I should share this with the community, even if it is a “quick-hack-with-bad-written-code” J

To run the script, start Azure PowerShell and set up a connection to your Azure subscription. Also make sure you have a C:\TEMP folder. The script will export your Azure network configuration and read it. The script will also query your Azure subscription for information for example virtual machines with NSG associated. The HTML file will be named C:\temp\net.htm.

First part of the HTML page is an overview of VNET, subnets, Address prefix and associated NSG. The second part of the HTML page is an overview of NSG rules in use. In this example I have three NSG in use, two associated with subnets and one associated with two virtual machines. There is also one NSG that is not in use at all.

Download the script List NSGv2.

 

 

Note that this is provided “AS-IS” with no warranties at all. This is not a production ready management pack or solution for your production environment, just an idea and an example.

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