For example, multiple Web sites can share a single IP address, one computer can have multiple IP addresses and, in a LAN environment where multiple computers share a single high-speed Internet connection, only the router has an IP address on the Internet. *It's actually more complicated than this. Minor, the former chief executive at ." I was not aware of this when writing this posting. December 17, 2007: According to this article in the New York Times, OpenDNS was started with ". The same heads-up applies to anyone using one of the wireless data services from a cell phone company. For example, laptop users interested in OpenDNS should change the wired Ethernet, modem dial-up, and wireless Wi-Fi connection. Since referencing a computer by IP address does not involve DNS, you always have to be on the lookout for this, as the link is bound to be bad news.Īlso, if you have multiple ways of connecting to the Internet on your computer, then you'll have to make the necessary TCP/IP configuration changes for each connection. I mention this for a couple reasons.įirst, malicious e-mail messages sometimes include links based on an IP address (e.g., ) rather the name of the computer. Any program that accesses computers by name will be protected, whether it be a Web browser, e-mail program, instant-messaging program, FTP or whatever. Let me end by pointing out that OpenDNS protection applies to your Internet connection. Next time, I'll go into more detail on the various types of protection offered by OpenDNS. That intelligence, such as preventing you from accessing known bad Web sites, is the big selling point (if a free service can have a selling point). In addition to infrastructure, OpenDNS adds intelligence to the translation process that was not part of the original design of the DNS system. If your computer is talking to a compromised DNS server, you can enter "(for example) into the address bar of your Web browser and not end up at Citibank's Web site, but instead be looking at a phony imitation Web site. Nothing is worse than a compromised DNS server. Hopefully, because they are specialists, their DNS servers will be more resistant to attack by the bad guys. Consider that the first reason to use them. A cable TV company or a telephone company may not have the in-house expertise to do this well. In addition, speed and redundancy are critical issues. Running DNS servers is not a trivial thing-there are many configuration options that need to be understood and correctly set up.
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