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Thank you for contacting Intel Communities.
I am sorry to hear you are having issues to connect through the LAN. I found the following information that you may find useful:
How to Install/Configure Intel i219 Network Adapter in CentOS 6 - Exxact
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
Please let me know how it goes.