What a Web Application Firewall Does
Key What a Web Application Firewall Does
A Web Application Firewall (WAF) sits between your website and the internet. It inspects all incoming traffic, blocks malicious requests, and allows legitimate visitors through. Think of it as a security guard that checks every visitor before they enter your site.
Types of WAFs
Key Types of WAFs
Cloud-Based WAF: Sits on the CDN network and filters traffic before it reaches your server. Cloudflare and Sucuri offer cloud-based WAFs. Easiest to set up and most effective for most sites.
Plugin-Based WAF: Runs on your server as a WordPress plugin. Wordfence is the most popular. Good protection but adds server load.
Server-Level WAF: Configured at the server level. ModSecurity is the most common. Requires technical expertise to configure.
What a WAF Blocks
Key What a WAF Blocks
- SQL Injection: Malicious database queries through form fields
- Cross-Site Scripting (XSS): Malicious scripts injected into pages
- Brute Force Attacks: Automated login attempts
- DDoS Attacks: Distributed denial-of-service traffic floods
- Malicious Bots: Automated scrapers, scanners, and crawlers
- File Inclusion Attacks: Attempts to access unauthorized files
Cloudflare Free WAF
Key Cloudflare Free WAF
Cloudflare free tier includes basic WAF protection. It blocks common attacks and provides DDoS protection. Setup takes 15 minutes - change your nameservers to Cloudflare. For most small business websites, the free tier provides adequate protection.
Wordfence WAF
Key Wordfence WAF
Wordfence includes a WAF that runs on your server. The free version provides real-time IP blocklist and basic firewall rules. Premium version adds real-time threat intelligence. Configure it to block known malicious IPs and patterns.
WAF Configuration Best Practices
Key WAF Configuration Best Practices
- Enable WAF before doing anything else on a new site
- Configure it to block common attack patterns
- Monitor WAF logs for blocked attack attempts
- Whitelist legitimate IP addresses that may be误flagged
- Keep WAF rules updated
The Business Case for WAF
Key The Business Case for WAF
A single successful attack can cost ₹50,000-₹2,00,000 in cleanup, downtime, and lost business. A WAF costs ₹0-₹5,000 per year. The protection to cost ratio is overwhelmingly in favor of having a WAF. It is the most cost-effective security investment you can make.
Related Resources
Key Related Resources
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