OZDISK PTY LTD

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SPAMMERS

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DNS (Domain Name Server) is what is used everytime someone tries to access a website. If you type www.ozdisk.com.au into your browser a small query goes off to find what IP  the webserver has in order to access it. It works like a phone book, that can update its information from other DNS servers located on the Internet. By tricking a local DNS server into replying with either a loopback address (127.0.0.1) or an internal address you stop the query from going further onto the Internet.

Once a computer is infected with malware or spyware, it can send information onto the internet for malicious hackers to turn computers into zombies or gather information which is confidential or even install more malicious softyware. Persons responsible for infected computers should remove the infected computers from the network and then remove the infections. Once it is clean or reimaged then put it back onto the network for use.

Now thats out of the way, here is way to help block and protect computers. Although this wont stop all infections it will reduce computers from accessing the domains that are known bad sites.

Stopping Malware & Spyware from talking to the internet by using a DNS null zone is very simple and does not require large hardware or specialised equipment. When a computer tries to access one of the sites on the list the DNS server will reply with a local IP thus keeping the data from going out onto the Internet.

It can be as simple as loading a local DNS application to your server. If you run a Windows server then you more than likely have this setup partially already. If you run Apple or Linux you can install and run a DNS server fairly easily. (Although the later will require further techs skills.)

For further information and details please visit “Black Hole DNS White Paper by David Glosser”

Another thing that can be looked at is using a HOSTS file http://www.mvps.org/winhelp2002/hosts.htm