动手实践虚拟网络 - 每天5分钟玩转 OpenStack（10） - CloudMan - 博客园
https://www.cnblogs.com/CloudMan6/p/5296573.html
linux中KVM桥接网卡br0 - mergerly的专栏 - CSDN博客
https://blog.csdn.net/mergerly/article/details/38422833
libvirt kvm 虚拟机上网 - Bridge桥接 - 东东东 陈煜东的博客
https://www.chenyudong.com/archives/libvirt-kvm-bridge-network.html
linux下brctl配置网桥 - ilinux_one - 博客园
https://www.cnblogs.com/ilinuxer/p/6629323.html
How To Setup Bridge (br0) Network on Ubuntu Linux 14.04 and 16.04 LTS - nixCraft
https://www.cyberciti.biz/faq/how-to-create-bridge-interface-ubuntu-linux/
Linux 网桥配置命令：brctl - 百度文库
https://wenku.baidu.com/view/e872856e011ca300a6c39042.html
权限错误
http://bloodiron888.blog.163.com/blog/static/1647332712010101853023528/
(KVM连载)4.4.2 使用网桥模式(bridge networking mode） – 笑遍世界
http://smilejay.com/2012/08/kvm-bridge-networking/
BridgeNetworkConnections - Debian Wiki
https://wiki.debian.org/BridgeNetworkConnections