# service network restart
Bringing up interface eth0: pcnet32 device eth0 does not seen to be present, delaying initialization.
ifconfig -a //でeth0がないことを確認
# reboot //serverを再起動
# ifconfig -a //のHWADDRを/etc/sysconfig/network-scripts/ifcfg-eth0のHWADDRを書き換える
# ifup eth0