| It seems nowadays if you are not online,
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| | about if you bring your son to work and
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| you don't exist. It really does not
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| | he downloads music on your fast company
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| matter what type of company you run, you
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| | internet connection only to introduce
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| should have an online presence to let
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| | your corporate network with a worm or
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| your prospects and clients know about
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| | even worst a Trojan horse. Service ports
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| your company and services. When you
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| | that are open to the public such as Port
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| decide to take the leap onto the Internet
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| | 80 HTTP, have know vulnerabilities on the
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| there are some precautions you should
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| | Internet. FTP has many vulnerabilities as
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| take. I have friends who say all the
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| | well.
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| time, I really have nothing to hide or
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| | Are there different types of firewalls?
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| worry about. This may be true, but
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| | Yes. There are hardware and software
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| malicious users like to deface
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| | firewalls. You might be even using Zone
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| websites.Which can ruin you and your
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| | Alarm or Black Ice Defender. These are
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| businesses reputation.
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| | software based firewalls, the more I
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| This is a paper about firewalls
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| | study firewall technology I realize that
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| protecting your company from outside
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| | everything truly is a software firewall.
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| threats and unauthorized access.
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| | A computer is nothing without software to
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| A firewall is a great start. Firewalls
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| | tell it what to do.
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| can be both hardware and software based.
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| | Packet Filters
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| There are many different firewall vendors
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| | Packet Filters look at source and
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| some of the bigger names are Cisco,
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| | destination addresses. This is where
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| Symantec, and Checkpoint. The difficult
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| | firewall rule sets come in to play. The
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| part is configuring the firewall. This is
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| | firewall administrator must determine
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| where many intruders bypass security,
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| | which source and destination ports and
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| because the firewall is poorly
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| | addresses to allow or deny. The security
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| configured.
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| | administrator needs to keep up to date
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| I would like to mention that there are
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| | with alerts on vulnerabilities as new
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| many Open Source programs and operating
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| | holes are found and created daily. A
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| systems that offer great firewall
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| | technique known as spoofing can sometimes
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| software. I personally believe that
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| | fool firewalls but making it appear that
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| OpenBSD has one of the most secure
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| | a packet is coming from inside the
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| operating systems and firewall
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| | protected network when in fact it is an
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| configurations if done right. FreeBSD
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| | attacker changing the source address.
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| also has firewall software, it is called
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| | Application Gateways
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| IPTABLES.IPTABLES offers packet
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| | Application Gateways are like errand
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| filtering, NAT and you can even change
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| | boys. You request a file and the
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| packets in Linux. I have to say you can
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| | application gateway grabs it for you.This
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| do anything you want in Linux, because
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| | is great for logging connections, and
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| the source code is right there. It's a
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| | setting up authentication as well.
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| beautiful thing. Linux also uses this;
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| | Statefull Packet Inspection
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| you can build a firewall with the old
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| | Statefull Packet Inspection is a
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| system sitting in your garage and two
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| | technique used by Cisco PIX firewalls and
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| Linux compatible network cards.Linux can
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| | Checkpoint Firewalls these firewalls look
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| be hardened, this means to make the
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| | at the data coming across the network.It
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| operating system more secure. I like the
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| | can also authenticate connections, users
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| tool Bastille Linux its is developed by
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| | can usually not notice that the firewall
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| Jeff Beale. To really get a grasp on
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| | is in place. Allot of firewalls now allow
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| firewalls you need to understand TCP/IP
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| | you to configure VPN's which is awesome
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| and allot of different protocols to know
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| | if you have remote workers and satellite
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| if you should allow or deny them into
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| | offices and need to transfer data
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| your network. IP addresses identify hosts
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| | securely.
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| on the Internet they look like this
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| | Intrusion Detection is also something to
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| 127.214.234.54. Firewalls can block IP
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| | consider, I like SNORT. SNORT can detect
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| addresses, ports, protocols and even
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| | known attacks against your system and
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| keywords that come into packets. Hackers
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| | does a great job at logging them if set
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| that want into you network have many
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| | up correctly. There are thousands of
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| different tools at their disposal to try
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| | different software and hardware solutions
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| to bypass firewalls. One common attack is
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| | you can purchase for you home or network.
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| known as Denial Of Service or DOS
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| | I happen to like Open Source, because I
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| attacks. The attacker simply floods your
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| | like learning and knowledge and the Open
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| network, firewalls with so many packets
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| | Source community has taught me more than
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| that it cannot handle them and sometimes
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| | the corporate world ever will. A book I
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| crashes. Firewalls are available with DOS
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| | would like to recommend that is great for
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| filtering to keep these attacks low, and
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| | learning firewalls is called simply
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| start dropping packets.
| |
| | enough Building Internet Firewalls, it is
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| Firewalls do not protect you from
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| | by O'reilly. That is all for now. One
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| internal threats such as employees
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| | last tip, backup, backup, backup.
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| bringing in viruses from home. Or remote
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| | Benjamin Hargis CEO MCP Phuture Networks
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| users using VPN's (virtual Private
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| | Free Computer Advice!
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| Networks) bypassing your firewall. Think
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| |
|
