Firewalls
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Thread: Firewalls

  1. #1
    AO's MMA Fanatic! Computernerd22's Avatar
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    Firewalls

    This is my tutorial by me Computernerd22 on Firewalls. It teaches you about firewalls, types of firewalls, and how these can influence your ability to surf. Please keep in mind this is more for the 'Novice' user.

    Key Concepts

    Software Firewall

    Hardware Firewall

    Disable

    FTP Test

    Error 10065


    What does this tutorial Cover?

    What is a firewall?

    What are the types of firewalls?

    How does a firewall work?

    What protection does a firewall offer?

    How can a software firewall affect my internet connection?

    Test if a firewall is blocking internet access?


    What is a firewall?

    A firewall is a system designed to prevent unauthorized access to or
    from a computer or private network. A firewall can be implemented in both
    hardware and software, or a combination of both. They are frequently used to
    prevent unauthorized Internet users from accessing computers or private
    networks connected to the Internet. All messages entering or leaving the
    computer or private network pass through the firewall, which examines each message
    and blocks those that do not meet the specified security criteria.


    What are the types of firewalls?

    Software (or Personal)

    Hardware Firewall (physical device)



    Software (or Personal)

    A software firewall is an application that has been installed on the
    computer. The firewall will inspect internet traffic and traffic generated from
    the pc intended for the internet.

    Popular Vendors:

    Norton

    ZoneAlarm

    McAfee

    Black Ice


    Hardware Firewall

    A hardware firewall is a separate physical device. In general, a
    hardware firewall can inspect internet traffic faster and more in-depth than a
    software firewall.


    Popular Vendors:

    Cisco

    WatchGuard

    Checkpoint

    How does a firewall work?

    Firewalls use one or more of following three methods to inspect

    internet traffic flowing in and out of the PCs internet connection:

    Packet Filtering – Internet traffic is compared against a list of
    rules. If the traffic matches a rule, then the traffic is allowed. If the traffic
    does not match a rule, then the traffic is discarded.

    Proxy Service - Information from the Internet is retrieved by the firewall and then sent to the requesting system and vice versa.

    Stateful Inspection - A newer method that doesn't examine the contents of each packet but instead compares certain key parts of internet traffic to a database of trusted information.

    What protection does a firewall offer?

    One of the best things about a firewall from a security standpoint is
    that it stops anyone on the outside from logging onto your computer.
    A firewall can block the following type of traffic
    :

    Remote login

    Application

    SMTP session hijacking

    Operating system bugs

    Denial of Service

    E-mail bombs

    Macros

    Viruses

    Spam

    Redirect Bombs

    Source Routing

    HTTP (Ability to view Web Pages!)

    HTTPS (Ability to view secure Web Pages!)


    How can a software firewall affect my internet connection?

    A software firewall can block the following:

    Access to secure websites

    Internet traffic

    Prevent applications from reaching the internet, Ex. Email Client
    (Outlook, Outlook Express)

    Test if a firewall is blocking internet access?

    Access a DOS Prompt

    FTP Test


    Test if a firewall is blocking internet access? How?

    Click on Start, Select Run, Type Command or cmd, Click OK button
    At the DOS prompt, type FTP 127.0.0.1 (or FTP “modem’s LAN
    Address”) Then hit the ENTER key on the keyboard.

    Now, If you receive a socket error 10065, it means that a software
    firewall application may be blocking traffic.

    But If you receive an Unknown Error Number (Windows XP), this is
    normal. If you receive a socket error 10061 then a firewall is not blocking
    traffic. Just type "bye" then hit the ENTER key to return
    to a normal prompt. Next type Exit and press ENTER key.

    Please Remember: Even though disabled, the firewall may still be 'active' in the background.

    I hope you enjoyed my tutorial on Firewalls. All feedback is appreciated. Computernerd22

  2. #2
    Senior Member
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    I know little about firewalls yet. But home users needs firewalls and extern firewalls are good to use as I know. But does it enough to have extern firewall, software AV and Antispy, as standard for home users?
    // too far away outside of limit

  3. #3
    AO's MMA Fanatic! Computernerd22's Avatar
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    But does it enough to have extern firewall, software AV and Antispy, as standard for home users?
    Having a external firewall and AV software and ANTI-Spyware is a good start but I would also recommend The following:

    Make sure your OS is fully up-to-date. (has all critical patches, system updates etc...)

    Use Encryption on your system! For various obvious reasons. NTFS uses EFS for Windows NT NT, 2000, XP, 2003, ALSO to secure data.

    Use strong passwords on your system.

    Disable ALL unneccessary services running on your PC. Two reasons, 1.) Takes up system resources and #2.) Any unneccessary hole is a hacker hole in your PC. Hacker hole = entry into PC. (With proper software f course )

    Disable all guests accounts.

    Set your OS/ROUTER/FIREWALL to block ICMP echo requests. Hope this helps, Computernerd22

  4. #4
    Senior Member
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    Encryption can be a problem if Vir/Spy become encrypted, difficult to find and remove with BartPE.

    Thx for good recommendations
    // too far away outside of limit

  5. #5
    AO Ancient: Team Leader
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    I think you need to read this, specifically, items numbered two and five.

    Just a thought.....
    Don\'t SYN us.... We\'ll SYN you.....
    \"A nation that draws too broad a difference between its scholars and its warriors will have its thinking done by cowards, and its fighting done by fools.\" - Thucydides

  6. #6
    Why not make it less of a description of how firewalls work, and put more emphasis on how to use and admninister them.

    Perhaps a tutorial specifically on administration of a single firewall, ie... Kerio, TinyPF, Norton, whatever.

    Just a thought.

  7. #7
    They call me the Hunted foxyloxley's Avatar
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    Make it Sygate [please]
    55 - I'm fiftyfeckinfive and STILL no wiser,
    OLDER yes
    Beware of Geeks bearing GIF's
    come and waste the day :P at The Taz Zone

  8. #8
    T3h Ch3F
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    Why Not

    Why not just post a link to one of thousands of web based articles describing the same noob information you just spent time typing out???

    Not rippin on you Nerd but this info is for School children or the elderly.


    Get some good religion from Bad Religion.

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