(OK) kvm

[root@localhost opt]# virsh net-edit default

<network>
  <name>default</name>
  <uuid>27a50d30-df46-497a-817d-1e630b31230e</uuid>
  <forward mode='nat'/>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:e3:1d:37'/>
  <ip address='112.26.2.254' netmask='255.255.0.0'>
    <dhcp>
      <range start='112.26.2.1' end='112.26.2.253'/>
    </dhcp>
  </ip>
</network>