yum : [Errno 14] curl#6 - "Could not resolve host: public-yum.oracle.com; Name or service not known"

Hi ,

I have internet on the sever "Oracle Linux 7.1"

but I can't use it within Yum command !!

Loaded plugins: langpacks

http://public-yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: public-yum.oracle.com; Name or service not known"

Trying other mirror.

No package oracleasm available.

Error: Nothing to do

please help.

Dia