Bill Williams (IT): Support Site
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[quote]I do wish I knew what this meant.[/quote] OK, lets have another go at explaining: When you click on an Internet link, or type in an internet address, you are usually typing in a NAME of a web page, such as www.comedy.co.uk But the Internet actually works on NUMBERS (called IP addresses) just like telephones only work with numbers. So behind the scenes, when you click a link containing a NAME, your computer browser program (such as Internet Explorer or Firefox) first of all has to look up the numeric address. It does this by consulting a service (for which it already knows the numeric address) {just like you might call directory enquiries to get a phone number, you have to KNOW the actual number of the Directory Enquiries service; 118 500 for BT, I think}. The Internet look-up facility service is called the "Domain Name Service" DNS and is provided by DNS servers (computers which have whacking great lists of names and their numbers). There are lots of them (all back linked to each other to automatically keep the lists up-to-date). Normally any user uses the DNS server provided by his/her broadband supplier, who has supplied to the user the actual NUMERIC address (not the name) of the 'local' DNS server. If a computer does not know a valid numeric address for a valid DNS server, it is impossible for that computer to visit any NAMED web page, because it will not be able to look up the corresponding numeric address of the web page. The "DNS Changer virus" on an infected computer interferes with that internal recorded number of the DNS server provided by the broadband supplier. The FBI & Estonian authorities removed the fake servers and substituted valid ones so the infected computers continued to work, but when they close down those temporary DNS servers on July 9th any infected computers will need to reset their internal copy of the numeric address to that of a valid DNS server. Bill. Revised on 27 Apr 2012
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