install Intel ethernet card driver

https://sourceforge.net/projects/e1000/files/igb%20stable/5.3.4.4/

http://blog.supportmonk.com/linux/update-intelr-gigabit-ethernet-network-driver-cent-os-6-5

Download the new driver from the link :http://sourceforge.net/projects/e1000/files/igb%20stable/5.2.9.4/
Unzip and compile the new module
tar -xzvf igb-5.2.9.4.tar.gz
cd igb-5.2.9.4/src
*Make sure server has the correct kernel-devel package corresponding to the installed kernel*
make install
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this will compile the module and place it at the default location /lib/modules/2.6.32-431.23.3.el6.x86_64/kernel/drivers/net/igb
*make sure you have the backup of the old binary as the above step replace original file*




If make error, maybe "make modules_prepare" helps.