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A firewall protects your network from unwanted Internet traffic. The
primary functions of a firewall are to let good traffic pass through
while ‘bad’ traffic gets blocked. The most important part
of a firewall is its access control features that distinguish between
good and bad traffic.
When installed, a firewall exists between your computer(s) and the
Internet. The firewall lets you request web pages, download files,
chat, etc. while making sure other people on the internet can not
access services on your computer like file or print sharing. Some
firewalls are pieces of software that run on your computer. Other
firewalls are built into hardware and protect your whole network from
attacks.
Everyone connected to the Internet should be running some sort of
firewall. Programs can be downloaded on the Internet that can scan
huge ranges of IP address for vulnerabilities like file sharing services.
These programs are easy to download and run. Almost no network knowledge
is needed to use these programs to exploit or harm your computer.
Any kind of firewall will keep you safe from these types of attacks.
Software Firewall
Software firewalls are programs that run on your computer and nestle
themselves between your network card software drivers and your operating
system. They intercept attacks before your operating system can even
acknowledge them. Many free firewalls of this type exist on the Internet.
Here are some free firewalls
Simple NAT firewall
The firewalls that are built into broadband routers and software like
Microsoft ICS are very simple firewalls. They protect your LAN by
not letting anyone figure out how to ‘directly’ talk to
any of the computers on your LAN. This level of protection will keep
out almost all kinds of hackers. Advanced hackers may be able to take
advantage of certain inadequacies of NAT based firewalls, but they
are few and far between.
Firewalls with stateful packet inspection
The new trend in home networking firewalls is called stateful packet
inspection. This is an advanced form of firewall that examines each
and every packet of data as it travels through the firewall. The firewall
scans for problems in the packet that might be a symptom of a ‘denial
of service’ (dos) attack or advanced attacks.
Most people are never subject to these types of attacks, but there
are some areas of the Internet that invite these kinds of attacks.
Most often, these attacks come from being involved in certain kinds
of competitive on-line gaming or participating in questionable mIrc
channels.
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