With the growing dependence on the Internet and the introduction of more web based applications that are fast becoming an integral part of everyday computing, the need to secure home and business networks from vulnerability from Internet based attacks become more of a necessity. In this regard, the inception of firewall-enabled routers is becoming more prominent. These types of broadband routers which come equipped with firewall protection and provides high-speed access to the Internet to multiple users via cable of DSL modems is the latest in securing home and business networks. The basic firewall option of these routers includes support for NAT, DHC, and DNS services in real time IP addressing allocation and also filtering of static IP which allows quick management of Internet services.

The proxy server is combined with a firewall for additional protection. The job of the proxy server is to retrieve requested web pages and send it to the requesting computer. The proxy server is like a messenger where the sending computer never interacts with the requesting computer and vice versa. This can help make your Internet connection efficient because the proxy server caches the web pages which allow it to load faster next time.

A DMZ or DeMilitarized Zone is an area outside of your firewall. It is like an unsecured area where you can allow items which do not need protection to remain. To setup the DMZ for multiple computers, just place one of the computers between the Internet access and your firewall. Some new firewall applications allow users to designate a directory on the gateway to act as DMZ.

The firewall is your network or computer’s first line of defense against external attacks which are meant to gain access to critical information. In order to be truly effective, system administrators and computer owners can implement various types of firewall techniques to fortify their defenses against malicious attacks. Common types of firewall techniques are:
1.Packet Filter- inspects every packet that enters or leaves your network applying rules defined by the user
2.Circuit-Level Gateway – security mechanism applied to UDP or TCP connections
3.Application Gateway – application specific security mechanism like Telnet and FTP servers
4.Proxy Server – hides the real network address by intercepting incoming and outgoing messages that flow through the network

One of the major concerns that the newest operating system from Microsoft, Windows Vista, is addressing is better overall security. The firewall version for the Windows Vista is designed for high configurability which also allows administrators to have greater control and management of system applications. The new firewall can filter incoming and outgoing traffic which gives it the capability to block access of outside machines that attempt to connect to your computer as well as applications in the local computer that are attempting to connect to other network systems. The ability of the console to function is categorized as single-machine mode where it manages a single computer or configured to regulate policies to multiple machines.

Firewalls are basically customizable which means that you can either add or remove filters based on your existing conditions. Here are some terms that you need to be familiar with when dealing with firewalls:
• IP (Internet Protocol) addresses – unique address assigned to a network machine, usually in the format 255.255.255.255
• Domain names – there are the human readable equivalent of the IP addresses, each IP address corresponds to a certain domain name
• Protocols – this are the communication services that are used in a network or Internet connection which includes IP, TCP, HTTP, FTP, UDP, ICMP, SMTP, SNMP and Telnet
• Ports – numbered ports serve as the entry point for different services running on the network or the Internet
• Specific phrases and words – this allows the firewall application to look for specific catch words or phrases to block

A security research firm, Heise Security, is criticizing Leopard’s security, or more specifically, the system’s firewall.

The firm was highly critical and declared that the firewall failed every test. The tests revolved around Apple’s default configuration and whether the firewall configured correctly due to user input.

According to them, Leopard’s firewall is not activated by default and, even when activated, it does not behave as one should expect. Network connections to non-authorised services can still be established and even under “Block all incoming connections” , the most restrictive setting, it still allows access to system services from the internet.

Apply acknowledges that the system services that it communicated with in its tests did not seem immediately prone to exploit.

Hacker Eliminator would not be considered a firewall, if you were to define a firewall as to mean that it is something that would block port connections made to your computer, or to keep users inside your network from going out to other networks. Even though these types of firewalls and firewall programs have their uses for specific jobs, they also tend to give computer users a false sense of security. Which is why a lot of people are easily targeted by hackers and viruses. They simply don’t think the computer is worth the time spending countless days over, examining each type of firewall and choosing the best one.

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To check if your computer has been turned to a zombie, there are available test sites you can find on the net. But you don’t just trust any site, you have to be somewhat picky on the test site that you will choose. Take this general rule: do not rely completely on sites that are provided by some company that is offering you firewall software products because obviously the findings will be bias: they would tell you to purchase their product because that is what they wanted from you.

After installing a reliable and trusted personal firewall, make sure that it is configured correctly. Then test it to ensure that the application is working purposely.

Once you have found out that you can actually test the quality of security that is implemented in your computer when you are online, you will see that it totally make sense. And it will make more sense if you can actually do the test to ensure your system’s security.

Your computer opens 65, 535 ports while you are surfing online on the cyber space or also known as the Internet. Because ports are blatantly open, some Interne outlaw may scan your system and may try its hardest to install what is called as a ‘bot’. This will make personal computer a part of some ‘botnet’.

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