/etc/libvirt/qemu/networks检查文件default.xml文件，发现没有任何信息。
cat /etc/libvirt/qemu/networks/default.xml
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
virsh net-edit default
or other application using the libvirt API.
-->
<network>
<name>default</name>
<uuid>536e2cf8-bf87-4d48-803d-b66297a6272b</uuid>
<forward mode='nat'/>
<bridge name='virbr0' stp='on' delay='0'/>
<mac address='52:54:00:74:15:48'/>
<ip address='192.168.124.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.124.2' end='192.168.124.254'/>
</dhcp>
</ip>
</network>
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