Under Linux, changing a NIC macaddress causes creation of empty eth1 and failure of all eth0-related settings. This init script renames eth1 back to eth0. Works under Redhat/CentOS.

fixeth0.sh

#!/bin/sh
#
# fixeth0        Rebind NIC from eth1 to eth0
#
# chkconfig: 2345 09 91
# description: After changing single NIC, automatically rebind it from eth1 back to eth0.

### BEGIN INIT INFO
# Provides: fixeth0
# Required-Start: $local_fs
# Required-Stop: $local_fs
# Short-Description: Rebind NIC from eth1 to eth0
# Description: After changing single NIC, automatically rebind it from eth1 back to eth0.
### END INIT INFO

# Based on http://superuser.com/a/598166

INSTALL_ME_SO='
wget  -O /etc/init.d/fixeth0 https://gist.github.com/ilyaevseev/4d4299da2f2eaa1f43ee/raw/c33f71788ee103c35e4e013571781fcc99b851e3/fixeth0.sh &&
chmod +x /etc/init.d/fixeth0 &&
chkconfig fixeth0 --add &&
chkconfig fixeth0 on
'

test "$1" = "start" || exit 0

config="/etc/udev/rules.d/70-persistent-net.rules"
ethcfg="/etc/sysconfig/network-scripts/ifcfg-eth"

test -s /sys/class/net/eth0/address || exit    # eth0 is live? exit..
grep -q 'eth1' "$config" || exit    # no udev record for eth1? exit..
test -s "${ethcfg}1"     && exit    # eth1 has network config? exit..

sed -i '/eth0/d'       "$config"
sed -i 's/eth1/eth0/g' "$config"

MACADDR=`awk -F',' '/eth0/ {print $4}' "$config" | awk -F'"' '{print $2}'`
#echo MACADDR = $MACADDR
sed -ie 's/HWADDR=".*"/HWADDR="'$MACADDR'"/' "${ethcfg}0"

/sbin/start_udev
#/sbin/service network restart

## END ##