In the last chapter, I talked about restricting access based on the user; in this chapter, I talk about restricting access to certain kinds of content. Such restrictions include not allowing people to access certain kinds of sites (e.g., pornography, news), preventing people from accessing specific types of content (e.g., RealAudio, MP3), and scanning content for viruses. I also discuss the various Security Servers for HTTP, FTP, SMTP, and TCP in some detail.
By the end of this chapter, you should be able to:
Know what CVP and UFP are used for
Restrict content for HTTP, FTP, SMTP, and generic TCP services
Understand the performance issues inherent in Content Security
Understand how to tune your FireWall-1 installation ...