This second edition of Building Internet Firewalls covers Unix, Linux, and Windows NT. It is a practical and detailed guide which provides step-by-step explanations of how to design and install firewalls, and how to configure Internet services to work with a firewall. It covers a wide range of services and protocols (for example, SMTP, FTP, DNS, Telnet, JavaScript, ActiveX, NetBT, SMB, Kerberos, CORBA, IIOP, ODBC, JDBC, and dozens more). It also contains a complete list of resources, including the location of many publicly available firewall construction tools.