A300225 Network Security -Firewall Bruce 2004.11.23 Turin.

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Presentation transcript:

A Network Security -Firewall Bruce Turin

A Some new words  Hack or hacker  Port ---windows  IP packet---person  Source address ---home  Distination address ---supermarket  Protocol  Packet filtrate ---guard

A What is security ？  Do not lost your key!  Do not lost your money!  Do not lost your passport!  Do not lost your baggage !  ……

A What is computer security ？  Physical security （ you can touch it, lock it down, or sit on it, it's physical. ） lock your computer in your room ！  Data security （ data is not corrupted or altered by some means. This includes data that's sent to or received from a network. ） take care of your hard disk!  Technical security (means defense ) updates your virus detection software!  ……

A Threaten to Network ？  Virus  Spam-mail  Steal Data  SPY  Hack attack  DoS attack  ……

A How to resolve ？  Virus ----anti virus software  Spam-mail ----anti spam software  Steal Data ---- IDS IPS  Hack attack ---- Firewall  DoS attack ----Firewall  ……

A Firewall  First, firewall is a wall!  Firewall like a guard.  Firewall like ….

A Definition of firewall  A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks. Basically, a firewall, working closely with a router program, filters all network packets to determine whether to forward them toward their destination. A firewall is often installed away from the rest of the network so that no incoming request can get directly at private network resources. There are a number of firewall screening methods. A simple one is to screen requests to make sure they come from acceptable (previously identified) domain names and IP addresses. For mobile users, firewalls allow remote access in to the private network by the use of secure logon procedures and authentication certificates.

A Group by…  Hardware: NAI, Symantec  Software: ISA2004--MS Check Point Norton personal Friewall Iptables --linux

A Group by theory  Packet filtering  Proxy  Gateway

A Group by money  Not free  Free

A Features  with packet, circuit, and application-level traffic filtering  Stateful Inspection  Application Filtering  Secure Server Publishing  Intrusion Detection  Virtual Private Networking support  ……

A Policy-Based Access Control  You can control inbound and outbound access according to user, group, application, source, destination, content, and schedule. Firewall policy wizards specify which sites and content are accessible, whether a particular protocol is accessible for both inbound and outbound communication, and whether communication between specified IP addresses, using specified protocols and ports, should be allowed or denied.

A What can a firewall do for u?

A Securely and Easily Provide Intranet Information Over the Internet  Firewall enables you to securely and easily publish intranet information over the Internet

A Control Internet Access and Protect Clients From Malicious Traffic on the Internet

A Securely and Easily Make Available to Employees Outside the Network

A HOW to manage?  ISA2004 the example.

A300225

 Another example. Another example.

A BeforeTomorrow 12:00 Saturday 8:30am- 7:30pm GENOVA8EURNY Sunday 4:15am- 10:30pm VENICE40EUR (+10.5EUR For boat) NY

A THANK U ALL!