1. #rm -rf /etc/udev/rules.d/70-persistent-net.rules 2. # rm -rf /etc/sysconfig/network-scripts/ifcfg-eth1 3. # rm -rf /etc/sysconfig/network-scripts/ifcfg-eth2 now create a file 4 # vim /etc/sysconfig/network-scripts/ifcfg-eth1 DEVICE=eth1 ONBOOT=yes take a reboot