#the nic name might change between the installation and 1st boot
#active all the nics with network link during system boot
for i in $(find /etc/sysconfig/network-scripts/ifcfg-*|egrep -v ifcfg-lo )
do 
  nicname=$(echo $i|awk -F 'ifcfg-' '{print $2}')
  if ethtool $nicname|grep -E -i "Link detected.*yes" >/dev/null 2>&1
     then sed -i 's/ONBOOT=no/ONBOOT=yes/' $i 
  fi

  #remove the entry 'HWADDR' from ifcfg-ethx, this is used to skip the 
  #nic name change during the install and first_reboot
  sed -i '/HWADDR/d' $i
done