Enter the Setup command in the terminal to enter the NIC configuration interface, and then select the third one (NIC configuration)
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Enter Select first (device configuration)
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Then enter to select the first card
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Manually configure static IP address and subnet mask DNS, and so on
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Then press the TAB key to move to OK to save.
This article is from the "Jimmy-hu" blog, make sure to keep this source http://jimmy1688.blog.51cto.com/12174375/1864780
How to configure the network card of CentOS (i)