If You copy/clone Your machine, or change network card, on linux Your interfaces get names eth1, eth2, eth3 and so on.
Before makeing changes just delete /etc/udev/rules.d/70-persistent-net.rules file.
After first boot, network interfaces will be enumerated from zero again.
One thought on “reset network interfaces on centos 6.3”
Thank you. This was easier than changing all kinds of configs