背景
使用libvirt默认NAT网络创建虚拟机，发现即使Mac地址不一样的虚拟机，会分配到同样的IP地址，怀疑是dnsmasq服务的range功能有问题：
libvirt默认的default网络：
# virsh net-list
Name State Autostart Persistent
----------------------------------------------------------
default active no yes
默认的default网络配置, dhcp range从192.168.122.2到192.168.122.254：
# virsh net-dumpxml default
<network>
<name>default</name>
<uuid>1f700d00-fe92-4d31-963b-f6038d46e3a4</uuid>
<forward mode='nat'>
<nat>
<port start='1024' end='65535'/>
</nat>
</forward>
<bridge name='virbr0' stp='on' delay='0'/>
<mac address='52:54:00:65:b0:e5'/>
<ip address='192.168.122.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.122.2' end='192.168.122.254'/>
</ip>
</network>
配置静态IP绑定
编辑默认网络， 根据虚拟机的mac地址和主机名，在
# virsh net-edit default
<network>
<name>default</name>
<uuid>1f700d00-fe92-4d31-963b-f6038d46e3a4</uuid>
<forward mode='nat'>
<nat>
<port start='1024' end='65535'/>
</nat>
</forward>
<bridge name='virbr0' stp='on' delay='0'/>
<mac address='52:54:00:65:b0:e5'/>
<ip address='192.168.122.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.122.2' end='192.168.122.254'/>
<host mac='52:54:00:65:f3:de' name='ubuntu-1804-hluo' ip='192.168.122.76'/>
<host mac='52:54:00:65:f5:df' name='nodejs' ip='192.168.122.77'/>
</dhcp>
</ip>
</network>
重启libvirt网络服务
# virsh net-destroy default
# virsh net-start default
重建虚拟机
# virsh destroy nodejs
# virsh create nodejs.xml
