When upgrading from CentOS 6.5 to 7.0 following the documentation in <a href="http://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool">http://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool</a> [<a href="http://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool" target="_blank">^</a>] after rebooting the network connections will be lost
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