Bellow commands can be used to troubleshoot this issue.
# dmesg | grep eth0 (displays information about the Ethernet controller card, mac address etc.)
# cat /etc/sysconfig/network (displays the network settings)
# cat /etc/sysconfig/network-scripts/ifcfp-eth0 (displays the network settings)
# ifconfig eth0 down (to down the nic)
# ifconfig eth0 up (to start the nic)
# netstat -rn (display kernel routing IP table)
# service network restart (restart the network settings)
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