Linux Firewalls, Third Edition

LAN Security Issues

Security issues are largely dependent on the size of the LAN, its architecture, and what it's used for. The services and architecture are also influenced by the public IP addressing available to the site. Perhaps even more basic than that is the type of Internet connection the site has: dial-up, DSL, wireless, cable, satellite, ISDN, leased line, or any of the other types of Internet connections. Following are some questions you should consider when creating a security policy for your site.

Is a public IP address dynamically and temporarily assigned via DHCP or IPCP? Does the site have a single permanently assigned public IP address or a block of them?

Are services offered to the Internet? Are these services hosted on the ...