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When you install Red Hat Enterprise Linux Server 6 on a server that previously had Red Hat Enterprise Linux 5 installed on it, you might find that logical network interfaces eth0, eth1, and so on. have moved to different physical network ports on the server. For example, the port that was interface eth0 on Red Hat Enterprise Linux 5 might become interface eth2 on Red Hat Enterprise Linux Server 6, while the port that was interface eth2 on Red Hat Enterprise Linux 5 might become logical network interface eth0 on Red Hat Enterprise Linux Server 6. Similarly, the ports associated with network interfaces eth1 and eth3 might be reversed after you upgrade Linux. In such a scenario, you either need to move network cables that are plugged into the server to match the Linux network configuration, or change the Linux network configuration.