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Introduction To Network Security Groups In Azure

In this article, we will provide an introduction to network security groups in Azure.

Purpose

The network security groups control the traffic on the virtual machine. The network security group can be associated with either of the following: -

Network Interface
Subnet

Rules In Network Security Group

There are two types of rules in the network security group: -

Inbound rules → Rules applied on the incoming traffic
Outbound rules → Rules applied on the outgoing traffic

Create A Virtual Machine

At the time of creating a virtual machine, you have an option for enabling the inbound rules in the Basics tab.

Picture showing the inbound port rules section while creating the virtual machine

Click to Enlarge

In the Networking tab, you can also specify the network security group and inbound rules as well.

Picture showing the setting the network security group and inbound port rules in the Networking tab while creating the virtual machine

Click to Enlarge

Either the network security group is created by default or you can specify the new network security group by selecting the Advanced radio button.

Picture showing the advanced radio button selected for network security group

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Once the virtual machine is created, you can see both the tabs i.e. inbound and outbound rules.

Picture showing the list of inbound port rules at the network interface level

Click to Enlarge

Picture showing the list of outbound port rules at the network interface level

Click to Enlarge

Mapping NSG With Network Interfaces And Subnets

If you go to the network security group, you can see that network security groups are associated with the network interface by default.

Picture showing the network security group associated with the network interface

Click to Enlarge

You can also go to the Subnets submenu and associate the network security groups with subnets.

Picture showing the Associate button for adding the network security group at the subnet level

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Friday, May 7, 2021

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