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by use virsh net-undefine command
This interface is created by libvirtd default network configuration. If you want to only disable this default network use the commands:
virsh net-destroy default
virsh net-autostart default --disable
If you want to remove it, use the comand:
virsh net-undefine default
If you want to disable the libvertd service itself, use the following command for RHEL5 and 6:
chkconfig libvirtd off
For RHEL7:
systemctl disable libvirtd.service