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    Firewall intro Firewall intro Presentation Transcript

    • An Introduction to Firewalls
    • Agenda
      • Firewall Basics for the Beginning User
      • NUIT Firewall Offering
      • Case Study – Desktop Firewall Software Implementation for the Office of Alumni Relations and Development
      • Questions and Answers
    • What is a Firewall?
      • A firewall is hardware, software, or a combination of both that is used to prevent unauthorized programs or Internet users from accessing a private network and/or a single computer
    • Hardware vs. Software Firewalls
      • Hardware Firewalls
        • Protect an entire network
        • Implemented on the router level
        • Usually more expensive, harder to configure
      • Software Firewalls
        • Protect a single computer
        • Usually less expensive, easier to configure
    • How does a software firewall work?
      • Inspects each individual “packet” of data as it arrives at either side of the firewall
      • Inbound to or outbound from your computer
      • Determines whether it should be allowed to pass through or if it should be blocked
    • Firewall Rules
      • Allow – traffic that flows automatically because it has been deemed as “safe” (Ex. Meeting Maker, Eudora, etc.)
      • Block – traffic that is blocked because it has been deemed dangerous to your computer
      • Ask – asks the user whether or not the traffic is allowed to pass through
    • What a personal firewall can do
      • Stop hackers from accessing your computer
      • Protects your personal information
      • Blocks “pop up” ads and certain cookies
      • Determines which programs can access the Internet
    • What a personal firewall cannot do
      • Cannot prevent e-mail viruses
        • Only an antivirus product with updated definitions can prevent e-mail viruses
      • After setting it initially, you can forget about it
        • The firewall will require periodic updates to the rulesets and the software itself
    • Considerations when using personal firewall software
      • If you did not initialize an action and your firewall picks up something, you should most likely deny it and investigate it
      • It’s a learning process (Ex. Spooler Subsystem App)
      • If you notice you cannot do something you did prior to the installation, there is a good chance it might be because of your firewall
    • Examples of personal firewall software
      • ZoneAlarm <www.zonelabs.com>
      • BlackICE Defender <http://blackice.iss.net>
      • Tiny Personal Firewall <www.tinysoftware.com>
      • Norton Personal Firewall <www.symantec.com>
      • ***Please be sure to read the license agreement carefully to verify that the firewall can be legally used at home and/or the office.
    • Windows XP Firewall
      • Currently *not* enabled by default
      • Enable under Start -> Settings -> Control Panel
      • Select Local Area Connection
      • Select the Properties button
      • Click the “Advanced” tab
    • Windows XP firewall
    • Updates to Windows XP Firewall
      • *Will* be enabled in default installations of Windows XP Service Pack 2
      • Ports will be closed except when they are in use
      • Improved user interface for easier configuration
      • Improved application compatibility when firewall is enabled
    • Mac OS X firewall
      • *Not* enabled by default
      • Enable under System Preferences
      • Select Sharing
      • Click “Firewall” tab
      • Click “Start” button
    • Mac OS X firewall
    • NUIT Firewall Service
    • Why Netscreen?
      • Comparison of the Big 3
        • Hardware vs. Software
        • Transparent Mode vs. Routing Mode
        • Distributed Management
        • Pricing Models
    • The Process
      • A Department requests a FW Consultation
      • TNS Organizes a Meeting
      • The Department Provides the List of Machines they want to Protect
      • TNS Measures Bandwidth Requirements
      • TNS Prepares a FW Proposal
      • The Department Makes their Decision
    • The Process continued...
      • TNS Installs the FW in a Passive State
      • TNS Logs All Traffic from the Target Hosts
      • TNS Develops a Rule Set
      • The Department Oks the Rule Set
      • TNS Activates the Rule Set
      • Everyone's Happy =)
    • Final Notes
      • Rule Management
      • Default Allow vs. Default Deny
      • Firewalls do NOT Solve the Entire Problem
    • Additional Information
      • Visit the following websites:
      • http://www.it.northwestern.edu/reference/firewall/firewall_strategies_wp.html
      • http://www.juniper.net/netscreen_com.html
      • Or simply email:
        • [email_address]
        • [email_address]