Do I need a hardware firewall or is software enough?

For most mid-market businesses, a next-generation firewall (hardware or virtual appliance) at the network perimeter is recommended. Cloud environments use cloud-native security groups. Individual devices should also have host-based firewalls enabled. For web applications, add a WAF (Cloudflare is popular and cost-effective).

What is a Web Application Firewall (WAF)?

A WAF specifically protects web applications by filtering and monitoring HTTP traffic. It blocks attacks like SQL injection, cross-site scripting (XSS), and DDoS. Unlike network firewalls that work at the network layer, WAFs understand web application protocols. Cloudflare and AWS WAF are popular choices for mid-market businesses.

How often should I review firewall rules?

Review firewall rules quarterly at minimum. Remove rules that are no longer needed. Verify that rules still align with business requirements. After any infrastructure changes, review affected rules immediately. Many organisations discover 20-30% of their firewall rules are obsolete during the first review.

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Firewall

Also known as:network firewallsecurity firewallpacket filter

A network security device or software that monitors and controls incoming and outgoing network traffic based on predetermined security rules, creating a barrier between trusted and untrusted networks.

In-Depth Explanation

A firewall acts as a security barrier between a trusted internal network and untrusted external networks (like the internet). It monitors all network traffic and permits or blocks data based on a defined set of security rules.

Types of firewalls:

Packet filtering: Examines individual packets based on source, destination, and protocol
Stateful inspection: Tracks active connections and makes decisions based on context
Application layer (proxy): Inspects the actual content of network traffic
Next-generation firewall (NGFW): Combines traditional firewall with intrusion prevention, application awareness, and deep packet inspection
Web Application Firewall (WAF): Protects web applications from HTTP-based attacks

Firewall deployment models:

Network firewall: Hardware or virtual appliance protecting the network perimeter
Host-based firewall: Software running on individual devices (Windows Firewall, iptables)
Cloud firewall: Cloud-native security groups and network ACLs
WAF: Cloud-based or on-premises web application protection

Business Context

Firewalls are the first line of defence for network security. Without a properly configured firewall, a business network is exposed to the entire internet, increasing attack risk by an order of magnitude.

How Clever Ops Uses This

Clever Ops configures and manages firewalls for Australian businesses, from cloud security groups to next-generation firewalls. We implement network segmentation, configure WAFs for web applications, and set up firewall monitoring to ensure continuous protection against network-based threats.

Example Use Case

"An Australian manufacturing company deploys a Fortinet FortiGate firewall with network segmentation, separating their office network from production systems and guest WiFi, then adds a Cloudflare WAF to protect their customer portal."