Please change the "/etc/sysconfig/network-scripts/ifcfg-eth0" and input a line "MACADDR=xx:xx:xx:xx:xx:xx".
If there still exits the problem, please change some relative points of the "/etc/sysconfig/networking/devices/ifcfg-eth0" or you can directly delete the this file.
↑これって
↓こいつを作り変えればいいのかな

#!/bin/sh

# restore MAC_ADDRESS

if [ -f /tmp/mac_addr.backup ]
then
MAC_ADDR=`cat /tmp/mac_addr.backup`
echo "MAC_ADDR = $MAC_ADDR"
setxenv -f /dev/mtdblock0 -k a.eth_mac -v \"$MAC_ADDR\"
fi