TAILIEUCHUNG - INTERNET FIREWALLS: FREQUENTLY ASKED QUESTIONS

Internet use among children in the EU27 is widespread and growing continually. The results of the Eurobarometer on “Internet safety” conducted in 2005/06 showed that 68% of children (6 to 17 yearsof- age) – in the opinion of one of their parents – had gone online4; this proportion increased to threequarters for this 2008 survey. Nevertheless, the number of children using the Internet varied considerably across Europe. The proportion of parents who thought that their child (6 to 17 years-of-age) used the Internet was the lowest in Italy (45%), Greece and Cyprus (both 50%). In all other Member States, at least two-thirds of the parents answered that,. | Internet Firewalls Frequently Asked Questions Internet Firewalls Frequently Asked Questions Paul D. Robertson paul@ Matt Curtin cmcurtin@ Marcus J. Ranum mjr@ Date 2009 04 01 22 26 42 Revision This document is also available in PDF Format Contents 1 Administrativia o About the FAQ o For Whom Is the FAQ Written o Before Sending Mail o Where Can I find the Current Version of the FAQ o Where Can I Find Non-English Versions of the FAQ o Contributors o Copyright and Usage 2 Background and Firewall Basics o What is a network firewall o Why would I want a firewall What can a firewall protect against o What can t a firewall protect against o What about viruses and other malware o Will IPSEC make firewalls obsolete What are good sources of print information on firewalls o Where can I get more information on firewalls on the Internet 3 Design and Implementation Issues What are some of the basic design decisions in a firewall o What are the basic types of firewalls o What are proxy servers and how do they work o What are some cheap packet screening tools What are some reasonable filtering rules for a kernel-based packet screen o What are some reasonable filtering rules for a Cisco o What are the critical resources in a firewall o What is a DMZ and why do I want one How might I increase the security and scalability of my DMZ o What is a single point of failure and how do I avoid having one o How can I block all of the bad stuff o How can I restrict web access so users can t view sites unrelated to work http pubs fwfaq p009 04 01 22 29 34 Internet Firewalls Frequently Asked Questions 4 Various Attacks o What is source routed traffic and why is it a threat o What are ICMP redirects and redirect bombs o What about denial of service o What are some common attacks and how can I protect my system .

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