attacks on your Azure network attacks on your Azure network

Last Updated on June 12, 2024 by Arnav Sharma

Azure Firewall is a cloud-based network security service that offers stateful inspection of both ingress and egress traffic to protect Azure Virtual Network resources. This fully managed service by Microsoft Azure simplifies the process of securing network traffic in a highly scalable and available architecture, making it an essential component for any robust network security strategy.

Overview of Azure Firewall Basic

The new SKU, Azure Firewall Basic, is designed to cater to the needs of small and medium businesses (SMBs) that require a reliable firewall solution at a cost-effective price point. This SKU provides the essential features needed to secure their Azure network environments without the complexities and costs associated with more advanced features found in higher-tier SKUs like Azure Firewall Standard and Premium.

Azure Firewall Basic

Azure Firewall Basic includes the following features:

  • Built-in high availability
  • Availability Zones
  • Application FQDN filtering rules
  • Network traffic filtering rules
  • FQDN tags
  • Service tags
  • Threat intelligence in alert mode
  • Outbound SNAT support
  • Inbound DNAT support
  • Multiple public IP addresses
  • Azure Monitor logging
  • Certifications

Key Features of Azure Firewall Basic

Stateful Firewall Capabilities

Azure Firewall Basic operates as a fully stateful firewall service, meaning it can monitor the full state of active network connections such as TCP streams, UDP communication, and ICMP requests. This ensures that all packets belonging to a given connection are allowed to pass through the firewall, providing robust protection against various network threats.

Built-in High Availability

High availability is ingrained in Azure Firewall Basic, with automatic scaling and redundancy to ensure continuous network protection and uptime without any additional configuration. This feature is crucial for businesses that rely on constant internet connectivity and cannot afford downtime.

Threat Intelligence-Based Filtering

Incorporating threat intelligence from Microsoft’s vast landscape, Azure Firewall Basic is equipped to identify and block known malicious IP addresses and domains automatically. This is a vital feature for preventing attacks before they reach network resources, significantly enhancing overall security posture.

Integration with Azure Services

Azure Firewall Basic seamlessly integrates with other Azure services, such as Azure Monitor and Azure Firewall Manager, to provide a comprehensive view of firewall logs and network traffic patterns. This integration helps in the easy deployment, management, and monitoring of firewall configurations across multiple Azure subscriptions and resources.

Choosing the Right Azure Firewall SKU

When deciding between Azure Firewall Basic, Standard, and Premium, it is essential to consider the specific needs of your network:

  • Azure Firewall Basic: Ideal for SMBs that need basic network protection. This SKU includes all fundamental firewall functionalities at a lower cost.
  • Azure Firewall Standard: Recommended for enterprises that require more advanced features, such as network traffic filtering across multiple subscription and hybrid environments.
  • Azure Firewall Premium: Suitable for organizations that need top-tier security features, including TLS inspection, IDPS (Intrusion Detection and Prevention System), and URL filtering.

Pricing and SLA Details

Azure Firewall Basic offers a straightforward pricing model that includes both deployment and operational costs, making it an affordable option for smaller businesses. The pricing details are transparent, and Microsoft provides an SLA that guarantees built-in high availability and regular security updates, ensuring peace of mind for businesses operating in the Azure cloud.

Deployment and Availability

Azure Firewall Basic is available across multiple availability zones, providing redundancy and fail-safe operations to maintain service continuity during zone outages. The deployment process is simplified through the Azure Portal, where users can configure and manage their firewall settings centrally.


FAQ: 

Q: What are Azure Virtual Networks?

A: Azure Virtual Networks (VNet) are a fundamental building block for any network within Microsoft Azure, enabling Azure resources like virtual machines to securely communicate with each other, the internet, and on-premises networks.

Q: What is Azure Firewall?

A: Azure Firewall is a managed, cloud-based network security service that protects your Azure Virtual Network resources. It’s a stateful firewall as a service that offers high availability and integrates seamlessly with Azure Monitor to provide threat intelligence and network traffic analysis.

Q: What are the different SKUs available for Azure Firewall?

A: Azure Firewall is available in multiple SKUs: basic, standard, and premium. The basic SKU is a new entry-level offering, providing an affordable price point while still delivering the essential security features. Azure Firewall Standard and Premium SKUs offer more advanced features, with Premium being recommended for highly sensitive and critical workloads due to its enhanced capabilities like threat intelligence and additional security features.

Q: How does Azure Firewall integrate with Azure’s infrastructure?

A: Azure Firewall is deeply integrated with Azure’s infrastructure. It uses Virtual Hubs and Azure Virtual Network resources to funnel network traffic and apply security rules. It can be managed directly through Azure Firewall Manager, which simplifies administration across multiple firewalls and networks.

Q: What are Availability Zones in Microsoft Azure?

A: Availability Zones in Azure are unique physical locations within an Azure region. Each zone is made up of one or more datacenters equipped with independent power, cooling, and networking. They are designed to protect applications and data from datacenter failures through redundancy and high availability.

Q: How do you use Azure Firewall to protect Azure resources?

A: To use Azure Firewall, you deploy it within your Azure Virtual Network. It acts as a barrier through which all inbound and outbound network traffic must pass. This setup allows Azure Firewall to inspect and log all traffic, apply rules, and block or allow traffic based on the policies you’ve set up.

Q: What is the price point for Azure Firewall Basic?

A: The Azure Firewall Basic pricing includes both deployment and operational costs, making it a cost-effective option for companies looking to secure their Azure resources at an affordable price point. Pricing details can vary based on the volume of data processed and the specific configuration used.

Q: What is the Azure Monitor?

A: Azure Monitor is a service within Microsoft Azure that provides detailed views of resource and network performance across an Azure subscription. It helps track performance metrics and generate logs that assist in troubleshooting and ensuring the Azure environment runs smoothly.

Q: What threat intelligence features does Azure Firewall offer?

A: Azure Firewall includes built-in threat intelligence features sourced from Microsoft Threat Intelligence. It helps identify and block known malicious IP addresses and domains, effectively protecting against threats before they reach the network.

Q: What enhancements does Azure Firewall Premium provide over the Azure Firewall Standard?

A: Azure Firewall Premium offers several enhancements over the Standard version, including better threat protection with advanced intelligence from the Microsoft Threat Intelligence feed. It also supports additional firewall capabilities like improved packet inspection, and threat mitigation strategies, and provides built-in high availability. This premium version is ideal for organizations requiring advanced security features to protect against complex threats

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