Problem In Installing The Software Using The Command Line

Hi all,
i am new to linux, i am using Centos 6. There is some problem in the network settings as i am able to browse internet from a browser but when i am trying to use the terminal (using ping command) for any of the website (say www.google.com) nothing is happening. suppose i want to install some software (like hdf5), when i am using "sudo yum install hdf5" it shows large number of error massages like "error could not connect to the host". It would be a great help if someone provide the solution.
Thanks in advance.

Durgesh


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