Virtual machine CentOS 5.5 Yum error occurred

Virtual Machine CentOS 5.5
Yum Install build-essential

Error Error:cannot find a valid baseurl for repo:addons

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You ping http://www.baidu.com to see

Ping:unknown Host Http://www.baidu.com
Such a result

Ping:unknown Host Http://www.baidu.com
Such a result
Obviously, your Linux is not configured for DNS, so there is no network connection, and Yum will use the extranet to download, so there is the landlord you raised the question

NameServer 8.8.8.8
NameServer 8.8.4.4
Yes, it is.

NameServer 8.8.8.8
NameServer 8.8.4.4
Yes, it is.
You set the next DNS, you are IPV several?

Oh, v4.

Is it bridging or sharing a private network?

I don't even know how to surf the Internet ... Not even the Internet yum How to use ah ....

I don't even know how to surf the Internet ... Not even the Internet yum How to use ah ....
Set up DNS Ah, setup inside set

Yum Groupinstall "Development Tools"

Yum Clean All

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