This book covers all the concepts and issues Solaris 8 administrators need to know in order to make and keep their Solaris 8 systems secure. This includes not only Solaris 8 security tools and features, but such subjects as cryptography and defenses against known attacks and vulnerabilities. Readers learn practical, command-level defenses: how to configure a secure DNS server, make IPsec work, identify and prevent system compromises, configure sendmail, and automate security checkups. They also learn what they need to do with /etc/inet/inetd.conf and why DES fails. The book provides a proactive approach to security. Coverage includes intrusion detection systems, network-level filtering, firewalls and other network-level systems.