What are the advantages and disadvantages of OpenDNS?

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Archive for Unix/Linux

Hard Drive Data Recovery Made Easy with Unstoppable Copier Software

Posted by Raj on August 1, 2007 · Filed under Windows, Tools/Utils/Hacks, Software/Apps, Unix/Linux

Tags: Data Recovery, Unstoppable Copier

Recovering files from disks of your laptops, servers and personal computers with bad sectors, badly damaged disk, scratches and boot sector failures has become easy with a free tool called Unstoppable Copier. The tool does its great job of recovering files and folders from bad disks by ignoring all the error messages that one would have otherwise encountered while using standard ways and tools to retrieve data from damaged disks. The advantage of using this approach is that some types of files can still be used even if some parts at the end of it could not be retrieved due to extensive damage of sectors on the disk. You may no longer have to look for a data recovery service.

Unstoppable Copier

This free data recovery tool has some great features which are not even found in some professional tools.

* You can change the level of data recovery, from extensive to skipping damaged files completely.

* The data recovery process can be paused and resumed.

* Logging can be enabled to record details on transfered files, their integrity and offsets of any errors.

* Multiple directories structures or single files can be dragged and dropped onto unstoppable copier for transfer.

* Support for multiple foreign languages such as English,German, Italian,French, Spanish, Russian, Turkish, Hungarian and Polish. However, the Linux version of this data recovery tool does not support these many languages.

» Download Unstoppable Copier for Windows or Linux | Visit the website

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What is OpenDNS?

OpenDNS was launched in July 2006 by hacker/entrepreneur David Ulevitch. It received venture capital funding from Minor Ventures, which is led by CNET founder Halsey Minor.

On July 10, 2006, the service was covered by digg[1], Slashdot[2], and Wired News[3], which resulted in an increase of DNS requests from just over one million requests on July 9 to 30 million on July 11.[4].

On October 2, 2006, OpenDNS launched Phishtank, an online collaborative anti-phishing database.

In 2006, OpenDNS began using the DNS Update API from DynDNS to handle updates from users with dynamic IPs.[5]

Since January 2007, OpenDNS provides geographically distributed servers in Seattle, Palo Alto, New York, Washington, D.C., London, with planned expansions to Chicago and Hong Kong.

On June 11th, 2007, OpenDNS started advanced web filtering to optionally block adult content for their free accounts.

[edit] Services

OpenDNS offers DNS resolution for consumers and businesses as an alternative to using their Internet service provider's DNS servers. By placing company servers in strategic locations and employing a large cache of the domain names, DNS queries are usually processed much more quickly[6], thereby increasing page retrieval speed. DNS query results are sometimes cached by the local operating system and/or applications, so this speed increase may not be noticeable with every request, but only with requests that are not stored in a local cache.

Other features include a phishing filter and typo correction (for example, typing wikipedia.og instead of wikipedia.org). By collecting a list of malicious sites, OpenDNS blocks access to these sites when a user tries to access them through their service. OpenDNS recently launched Phishtank, where users around the world can submit and review suspected phishing sites.

A screenshot of a 'phishing blocked' page

A screenshot of a 'phishing blocked' page

OpenDNS is not, as its name might seem to imply, open source software.

OpenDNS earns a portion of its revenue by sending the user to an OpenDNS search page when a domain name that he has entered is not valid. Advertisements are displayed on this search page to help fund the operations of OpenDNS. While this behavior is similar to VeriSign's previous Site Finder, OpenDNS states that it is not the same, as OpenDNS is purely an opt-in service (compared to Site Finder's effect on the entire Internet, as VeriSign is an authoritative registry operator)[7] and that the advertising revenue pays for the customized DNS service[8].

According to OpenDNS, additional services that run on top of its enhanced DNS service will be provided, and some of them may cost money[8].

One example of such an added service was the company's April 22, 2007 launch[9] of "shortcuts", letting users make custom DNS mappings, such as mapping "mail" to "mail.yahoo.com". This feature launch was covered by a large number of publications, including the New York Times[10], Wired[11], and PC World[12].

Opendns Advantages

OpenDNS is a free service that offers you with addresses of its free DNS servers that .... Each of those tools have their own advantages and disadvantages. ...