Tech Tips Home
The Best Tech Tips And Daily Deals
Newsletter On The Internet!

Shop online 24hrs a day or call us Mon-Fri
8:30AM-4:30PM EST - 1-800-915-2088
WorldStart Tech Tip And Store Search
Email: Password: Login Remember Me

Like what you see here? Subscribe to the Tech Tips newsletter!   Email: Subscribe

Firewall Basics

Friday, July 6th, 2007 by | Filed Under: Computer Terms
 
Loading...


Firewall Basics

We here at WorldStart have talked about firewalls before, but we have never just taken a step back and given you the basics about them. So, that’s exactly what I’m going to do for you today!

A firewall is designed to help protect your computer from being attacked by malicious users or by malicious software programs, such as viruses that use unsolicited incoming network traffic and so on. Now, before you disable your firewall, you must disconnect your computer from all the networks, including the Internet.

Now, basically, a firewall is a system that is designed to prevent unauthorized access to or from a private network. You can implement firewalls in your hardware, software or both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks that are connected to the Internet. With all that said, let’s talk about some of the different types of firewalls available.

Different Types of Firewalls

Different firewalls use different techniques. Most firewalls use two or more of the following techniques:

Packet Filters: A packet filter looks at each packet that enters or leaves the network and accepts or rejects the packet based on user-defined rules. Packet filtering is fairly effective and transparent, but it is difficult to configure. In addition, it is susceptible to IP spoofing.

Application Gateway: An application gateway applies security mechanisms to specific programs, such as FTP and Telnet. This technique is very effective, but it can cause performance degradation.

Circuit-layer Gateway: This technique applies security mechanisms when a Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) connection is established. After the connection has been established, packets can flow between the hosts without any further checking.

Proxy Server: A proxy server intercepts all messages that enter and leave the network. The proxy server effectively hides the true network addresses.

Application Proxies: Application proxies have access to the whole range of information in the network stack. This permits the proxies to make decisions based on basic authorization (the source, the destination and the protocol) and also to filter offensive or disallowed commands in the data stream. Application proxies are “stateful,” meaning they keep the “state” of connections inherently. The Internet Connection Firewall feature that is included in Windows XP is a “stateful” firewall, as well as, the Windows Firewall. The Windows Firewall is included with Windows XP Service Pack 2 (SP2).

Now that you know some of the different types of firewalls and their configurations, you can better determine which one will work the best for your computer. I hope you find this information helpful!

~ Ramachandran Kumaraswami

Comments are closed.

Like these tips? Get them for FREE in your email!

WorldStart's Tech Tips Newsletter

  • Tech Tips Daily - Become a tech pro! Get the very best tech and computer help sent directly to your email every weekday!

  • Tech Tips Weekly - If you don't want our Tech Tips newsletter every day, then sign up for this weekly newsletter to get the best information of the week. Sent on Fridays.

Other Newsletters

  • WorldStart's Daily Deals - Every week, we send out great deals in our Daily Deals newsletter. Many of these deals are exclusively for our Daily Deals newsletter subscribers and can't be found with our regular specials.

  • Just For Grins - Each issue includes a couple clean jokes, some funny quotes, and a hilarious reader's story. Newsletter is sent five days a week.


Enter Email Address:

Subscribe

Your e-mail address is safe with us!
We only use it to send you the newsletters you request. It is NEVER disclosed to a third party for any reason, ever! Plus, if you decided you don't like our newsletters (don't worry, you'll love them), unsubscribing is fast and easy.

Free Newsletter Signup



Tech Tips Daily

Become a tech pro! Get the very best tech and computer help sent directly to your email every weekday!

Tech Tips Weekly

The week's best in tech and computer help. Get your issue sent to your email every Friday!

WorldStart's Daily Deals

The very best deals on the Internet! Get a new set of incredible sales every day of the week!

Just For Grins

Clean jokes, funny quotes, and hilarious comics. Sent 5 times a week straight to your email.


Subscribe


Love Worldstart? Refer A Friend!

WorldStart's Premium Membership

Tip Archive


Categories:
Archives: