Security Considerations

In practice the DNS service behaves very much like the /etc/hosts file on your computer, which is where the system initially looks up name resolutions before relying on the DNS system. The file is basically a list of IP addresses followed by the name you’ve associated with those IP addresses for SONY-VGP-BPS8 battery . For example, if you edit the file you can associate any domain name with any IP address of your choosing.

  1. Open Terminal and enter the following command to edit the hosts file

    sudo pico /etc/hosts

  2. Go to the bottom of the file and enter the following:

    74.125.19.106 VGP-BPS2A

  3. Press control-o followed by the return key to save the file

After you have done this, open your web browser and enter “www.apple.com” in the address bar. If everything works as it should, you should see the homepage of Google load instead of that of Apple. The hosts file has resolved “www.apple.com” to the IP address for Yahoo. To reverse the change, delete the line and re-save the file.

What you have just done is outlined one potential problem with any domain name resolution service for Apple A1175 battery , which is that any can improperly resolve domain names, sometimes purposefully for malicious purposes.

Imagine having a name like your bank’s website resolved to a server that looks exactly like your bank, but actually is not. The name in your browser’s address bar will be your bank’s address, and the website may look the same, but the server in actuality is not. This is one hack that thieves have used to steal identities (called “Pharming”),VGP-BPS2 battery and as you can see by the editing of the hosts file it’s not all that hard to do. In fact, some recent malware for OS X (DNSChanger) can alter the DNS servers in your system to servers which strive to do exactly this.

 

Overall, the use of DNS servers requires an element of trust, both to prevent misdirection as well as to get the best performance. Most DNS servers are provided by your internet service provider and usually can be trusted, but may not be the best name resolvers. The main reason for this is the servers get overburdened with requests from all the ISP’s customers to Dell C1295 , and as a result pages may take time to fully load, with your browser pausing on certain parts of web pages. This can be due to latency between your computer and the server because of the server’s network, and communication problems between the name server and others on it’s network. Additionally, servers may suffer from caching issues depending on the demands placed on them.

To get around these problems, a few open (public) solutions have become available which are highly optimized and maintained and F4809A. The OpenDNS project maintains a couple of DNS servers that have a reputation for being fast and devoid of the problems that other DNS servers endure, which you can use preferentially to those provided by your ISP. To do this, enter the following IP addresses into the DNS server list in the network system preferences (Select your network interface and click the “Advanced…” button).

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