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FIREWALLS Created and Presented by: Dawn Blitch & Fredda Hutchinson What is a Firewall? A Firewall is simply a program or hardware device that filters the information coming through the internet connection into your private network or computer system. History of Firewall

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firewalls

FIREWALLS

Created and Presented by:

Dawn Blitch

&

Fredda Hutchinson

what is a firewall
What is a Firewall?
  • A Firewall is simply a program or hardware device that filters the information coming through the internet connection into your private network or computer system.
history of firewall
History of Firewall
  • First Generation-(1985) First security firewalls appeared. Network layer IP routers with filtering rules that had to be manually changed by the administrator. (Must have intranet access or valid IP address)
  • Second Generation-(1989-1990) Circuit level firewall gateways that prevented direct connections between networks through address authorization.
history of firewalls
History of Firewalls
  • Third Generation-(1991) First commercial firewall (DEC SEAL), Used filters and application gateways or proxies.
  • Fourth Generation-(1994) Check Point Technologies, Firewall-1, developed “first user friendly” firewall. Used dynamic packet filters that dynamically changed filtering rules.
history of firewall5
History of Firewall
  • Fifth Generation-(today) Kernel Proxy architecture, which evaluates network packets at multiple layers of a protocol stack in the proxy server.
types of firewalls
Types of Firewalls
  • Network Layer-A hardware firewall that controls what packets or information that are passed in or out of your network
types of firewalls7
Types of Firewalls
  • Application Layer-Software that does not allow direct connections between networks, which performs logging and auditing of traffic.
cautions
Remote Login

SMTP session hijacking

Operating system bugs

Denial of Service

E-mail bombs

Macros

Viruses

Spam

Redirect bombs

Source routing

Application backdoors

Cautions

Firewalls may only limit these items to an extent.

slide11

The level of security you establish will determine how many of these threats can be stopped by your firewall. The highest level of security would simply block everything, this would defeat the purpose of having an internet connection. Basic rule of thumb for all administrators is to first block everything and then implement rules which allow only certain information or packets to pass.

why would i want a firewall
Why would I want a Firewall?
  • To keep hackers out of your network while still letting you get your job done.
  • Plays an important role as a security blanket for management
  • Mainly just to help
  • Gives you a place to store secure information that people in your corporation need access to.
do they work
Do They Work?
  • To simply answer this question, they work to an extent, but of course, if a true hacker wants your information they will stop at nothing to get it. And as always, there are accidents that do occur when testing new software, such as probes. So just be cautious!
websites for firewall products
Websites for Firewall Products
  • http://www.mcafee.com
  • http://www.checkpoint.com
  • http://www.smartsoftwareshopper.com
  • http://www.netscreen.com
sites used
Sites Used
  • http://www.interhack.net/pubs/fwfaq/
  • http://computer.howstuffworks.com/firewall.htm
  • http://dmsweb.badm.sc.edu/mgsu890/firewalls/fire2.htm