Book Image

Azure Networking Cookbook

By : Mustafa Toroman
Book Image

Azure Networking Cookbook

By: Mustafa Toroman

Overview of this book

Microsoft provides organizations with an effective way of managing their network with Azure's networking services. No matter the size of your organization, Azure provides a way to highly reliable performance and secure connectivity with its networking services. The book starts with an introduction to the Azure networking like creating Azure virtual networks, designing address spaces and subnets. Then you will learn to create and manage network security groups, application security groups, and IP addresses in Azure. Gradually, we move on to various aspects like S2S, P2S, and Vnet2Vnet connections, DNS and routing, load balancers and traffic manager. This book will cover every aspect and function required to deliver practical recipes to help readers learn from basic cloud networking practices to planning, implementing, and securing their infrastructure network with Azure. Readers will not only be able to upscale their current environment but will also learn to monitor, diagnose, and ensure secure connectivity. After learning to deliver a robust environment readers will also gain meaningful insights from recipes on best practices. By the end of this book, readers will gain hands-on experience in providing cost-effective solutions that benefit organizations.

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Table of Contents (13 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Sections
Get in touch
Free Chapter
1
Azure Virtual Network
Azure Virtual Network
Technical requirements
Creating a virtual network in the portal
Creating a virtual network with PowerShell
Adding a subnet in the portal
Adding a subnet with PowerShell
Changing the address space size
Changing the subnet size
2
Virtual Machine Networking
Virtual Machine Networking
Technical requirements
Creating Azure VMs
Viewing VM network settings
Creating a new network interface
Attaching a network interface to a VM
Detaching a network interface from a VM
3
Network Security Groups
Network Security Groups
Technical requirements
Creating a new NSG in a portal
Creating a new NSG with PowerShell
Creating a new allow rule in NSG
Creating a new deny rule in NSG
Creating a new NSG rule with PowerShell
Assigning an NSG to a subnet
Assigning an NSG to a network interface
Assigning an NSG with PowerShell
Creating an Application Security Group (ASG)
Associating an ASG with a VM
Creating rules with an NSG and an ASG
4
Managing IP Addresses
Managing IP Addresses
Technical requirements
Creating a new public IP address in the portal
Creating a new public IP address with PowerShell
Assigning a public IP address
Unassigning a public IP address
Creating a reservation for a public IP address
Removing a reservation for a public IP address
Creating a reservation for a private IP address
Changing a reservation for a private IP address
Removing a reservation for a private IP address
5
Local and Virtual Network Gateways
Local and Virtual Network Gateways
Technical requirements
Creating a local network gateway in the portal
Creating a local network gateway with PowerShell
Creating a virtual network gateway in the portal
Creating a virtual network gateway with PowerShell
Modifying the local network gateway settings
6
Creating Hybrid Connections
Creating Hybrid Connections
Technical requirements
Creating a Site-2-Site connection
Downloading the VPN device configuration from Azure
Creating a Point-2-Site connection
Creating a VNet-2-VNet connection
Connecting VNets using network peering
7
DNS and Routing
DNS and Routing
Technical requirements
Creating an Azure DNS zone
Creating a new record set and record in Azure DNS
Creating a route table
Changing the route table
Associating a route table to a subnet
Dissociating a route table from the subnet
Creating a new route
Changing a route
Deleting a route
8
Load Balancers
Load Balancers
Technical requirements
Creating an internal load balancer
Creating a public load balancer
Creating a backend pool
Creating health probes
Creating load balancer rules
Creating inbound Network Address Translation (NAT) rules
9
Traffic Manager
Traffic Manager
Technical requirements
Creating a new Traffic Manager profile
Adding an endpoint
Configuring distributed traffic
Configuring traffic based on priority
Configuring traffic based on geographical location
Managing endpoint
Managing profiles
Configuring Traffic Manager with load balancers
10
Azure Application Gateway
Azure Application Gateway
Technical requirements
Creating a new application gateway
Configuring the backend pool
Creating HTTP settings
Creating a listener
Creating a rule
Creating a probe
Configuring a WAF
Customizing WAF rules
11
Azure Firewall
Azure Firewall
Technical requirements
Creating a new Azure Firewall
Configuring a new allow rule
Configuring a new deny rule
Configuring a route table
Enabling diagnostic logs for Azure Firewall
12
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Changing the address space size

After the initial address space is defined during the creation of a virtual network, we can still change the address space size as needed. We can either increase or decrease the size of the address space, or change the address space completely by using a new address range.

Getting ready

How to do it...

In order to change the address space size for a virtual network using the Azure portal, we must observe the following steps:

  1. In a virtual network blade, locate Address space under Settings.

  2. In the available address space, click on Address space and change the value. An example is shown in the following screenshot:

  1. After you have entered a new value for Address space, click Save to apply the changes.

How it works...

Although you can change the address space at any time, there are some rules that determine what you can or cannot do. Address space can't be decreased if you have subnets defined in the address space that wouldn't be covered by a new address space. For example, if the address space was in the range of 10.0.0.0/16, it would cover addresses from 10.0.0.1 to 10.0.255.254. If one of the subnets was defined as 10.0.255.0/24, we wouldn't be able to change the virtual network to 10.0.0.0/17, as this will leave the subnet outside the new space.

Address space can't be changed to the new address space if you have subnets defined. In order to completely change the address space, you need to remove all subnets first. For example, if we have the address space defined as 10.0.0.0/16, we wouldn't be able to change it to 10.1.0.0/16, since having any subnets in the old space would leave them in an undefined address range.

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