Cybersecurity is evolving and becoming an important concern in the modern world. Nowadays, companies mostly depend on cloud computing services, devices that connect to the internet, remote access systems, and internet-based applications. Companies thus require security measures that would secure users’ privacy, networks, applications, and corporate assets against various forms of cyberattacks. Two key security technologies commonly used in this scenario are DNS firewalls and network firewalls
While both technologies are used in network security, they serve completely different purposes and have different roles in terms of the company’s security infrastructure. Specifically, a DNS firewall is concerned with monitoring DNS requests and domain-level protection, whereas a network firewall is used for controlling network traffic.
What Is a DNS Firewall?
A DNS firewall refers to a type of security control that checks and manages DNS queries. The Domain Name System (DNS) translates domain names into IP addresses that help users to connect to websites and other online services. The DNS firewall evaluates the request before the user or device connects to the requested domain. Therefore, organisations can prevent users from accessing malicious, phishing, or restricted domains before a connection is established to destinations.
From a business perspective, DNS firewalls provide centralised internet access controls. Security teams will be able to set up allow lists, blocklists, and website categories that cannot be accessed by certain users and devices, as well as monitor DNS traffic. Moreover, threat intelligence would be helpful in determining domains connected to malware, phishing attacks, botnets, and other suspicious actions.
What Is a Traditional Network Firewall?
A Network firewall represents a form of security measure for controlling network traffic in accordance with specific security policies. Traditionally, a network firewall is installed in an environment with various network security needs, such as an internal network within a company and the Internet. A network firewall evaluates traffic and decides whether traffic needs to be allowed or prohibited according to specific security rules.
In traditional network firewall implementation, IP addresses, ports, protocols, and network connections can be used as parameters for controlling network traffic. Besides, network firewalls can also help in traffic management, protection of servers and applications, and network segmentation. Consequently, the role of the traditional network firewall within network security architecture is significant; however, its purpose is different from DNS-level security measures.
DNS Firewall vs. Traditional Firewall: Key Differences
DNS firewalls and traditional network firewalls both play important roles in cybersecurity, but they address different security requirements. DNS firewalls primarily focus on DNS queries and domain-level access, while traditional network firewalls focus on controlling network traffic and connections. As a result, their security policies, visibility, and business applications also differ.
| Key Factors | DNS Firewall | Traditional Network Firewall |
| Primary focus | DNS requests and domain access | Network traffic and connections |
| Security layer | DNS/domain level layer | Network level layer |
| Main controls | Domains, categories, reputation, DNS policies | IP addresses, ports, protocols, traffic rules |
| Primary protection | Malicious, phishing, and restricted domains | Unauthorised or unwanted network traffic |
| Policy enforcement | Domain-based access policies | Network and traffic-based policies |
| Typical use | DNS security and web-access control | Network, infrastructure, and access control |
| Visibility | DNS requests and domain activity | Network connections and traffic |
The primary distinction between the two technologies lies in the type of activity each one monitors and controls. Understanding the differences between Traditional and cloud firewalls can also help organisations determine which firewall architecture best suits their infrastructure and security requirements. The DNS firewall may protect organisations against users and devices attempting to reach suspicious domains, while the regular network firewall controls whether network connections are allowed. Therefore, organisations can deploy both types of controls for their different security needs.
Can a DNS Firewall Replace a Traditional Network Firewall?
A DNS firewall cannot be seen as an alternative to the traditional network firewall, as they fulfil distinct roles. DNS filtering can block requests to domains that have been identified as malicious or restricted. However, DNS filtering does not provide complete control over traffic within the network. The traditional network firewall provides traffic control through IP addresses, ports, protocols, network segments, and other defined parameters.
For instance, a DNS firewall can deny access to a domain that has been flagged as malicious, whereas the network firewall will check what machines are allowed to communicate, which ports are accessible, and what traffic is allowed into the network.
When Does a Business Need a DNS Firewall?
There could be some benefits to the use of a DNS firewall in companies where centralised management of DNS queries and internet access is required. Such technology may help businesses to block phishing and malware sites; implement web access rules at the domain level or by categories; and gain more visibility into DNS traffic. This solution will be helpful for organisations trying to restrict their employees from accessing malicious resources prior to establishing a connection.
Some additional features provided by DNS firewall solutions help organisations with remote and distributed workforces, cloud infrastructure, and hybrid environments, depending on the implementation of this technology. By consistently applying DNS security policies across users and devices, organisations can extend domain-level protection beyond their internal networks to remote, cloud, and hybrid environments.
When Do You Need Both a DNS Firewall and a Traditional Network Firewall?
Businesses with more comprehensive security requirements may use both solutions, as each addresses different aspects of network security. A DNS firewall can prevent connections to suspicious domains, whereas a network firewall controls the network traffic that is allowed between different systems and external networks.
For instance, consider a company that has multiple office locations, remote workers, cloud-based workloads, and important applications. An employee’s attempt to access a site may first be analysed by a DNS firewall according to DNS security policies. If the domain is malicious, the connection is prevented. If the domain is allowed, the connection is controlled by the network firewall by considering factors such as the source, destination, port, protocol, or application.
How to Choose the Right Firewall Security Approach
However, depending on the infrastructure, risk management strategy, and other organisational factors, prioritising one technology over another. For example, the DNS firewall may be applicable if domain-level security, web access control, and DNS threat prevention become the most important needs. Network firewalls must be used by an organisation if it needs to manage network traffic, secure servers and infrastructure, implement network access policy, and for other purposes.
The application of both technologies can be a solution for those organisations with hybrid infrastructure, distributed users, critical business systems, and other requirements. For small businesses, choosing the Right firewall for small businesses is important to protect business networks while meeting their security and infrastructure requirements. It is necessary to think about all organisational factors, including network structure, number of users/clients, cloud computing environment, remote access, cybersecurity measures, and others, before implementing any solutions. The task is to choose security controls to tackle the risks and fit into the security infrastructure of the company.
Conclusion
While the two technologies share some similarities, there are significant differences between a DNS firewall and a traditional network firewall. The DNS firewall focuses on DNS queries and domain security, while the Traditional Network firewall focuses on network security through network traffic analysis, connection management, and access control. Businesses looking to strengthen their overall network protection can explore reliable Firewall security solutions based on their infrastructure, security requirements, and business needs.
Organisations focusing on cybersecurity may find the use of both technologies beneficial in developing a layered cybersecurity strategy. While DNS security measures will prevent users and systems from accessing malicious websites, a traditional network firewall will help in protecting network communications. Both technologies should not be viewed as alternatives. Organisations can use them together to strengthen their overall security infrastructure.
