Web App Firewalls: How to Evaluate, Buy, Implement

The security engineer wanted to provide users with a single URL to access e-mail no matter where they were, and he wanted to be able to scale up the system without interruption. Because he can add an additional WAF appliance without giving it a new IP address, it's transparent to users. "If it starts being overloaded, all we have to do is get another one, put in a rack, cluster it with this one and we've got twice as much capacity," he says.