Host-based WAFs are inexpensive to deploy, but require specialized expertise to manage, are vulnerable to exploitation, and have limited scalability. For example, network-based WAFs have high performance and scalability, but are expensive to maintain and are usually difficult to integrate with other security solutions. Cloud-based WAF - Cloud WAFs are straightforward to deploy, offered on a subscription basis, and frequently require only a simple DNS or proxy update to divert application traffic.Įach of these options has advantages and disadvantages. Host-based WAF - A host-based WAF is installed into the application's software.They are placed locally and on-premises, as close to the application as possible, using dedicated and specialized equipment. Network-based WAF - Network-based WAFS are usually hardware-based devices that sit at the network layer of the OSI model.Sometimes, a hybrid approach is used where the WAF will use a mix of both whitelisting and blacklisting to filter traffic. Whereas, blacklisting is to allow traffic by default and block traffic from certain IP addresses or domains that are known to be malicious. Whitelisting is to block traffic by default and only allow traffic from certain IP addresses or domains that are known to be safe. There are primarily two approaches a WAF can take to filter traffic: whitelisting and blacklisting. Because of this, it provides greater visibility into sensitive data that flows through the web application. No other type of firewall can be deployed at the application layer. WAFs are deployed at the application layer or Layer 7 of the OSI model of the internet. The policies of a WAF can be based on different criteria, and can be modified at any time. The WAF will be configured to match the security requirements of the organization and its web applications. The WAF runs on a set of rules that determine which traffic should be allowed to pass through and which traffic should be blocked. Its main function is to filter and monitor the HTTPS traffic that comes in from the internet. When a WAF is deployed in front of the web application, it creates a barrier between the web application and the internet.
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