Ubuntu 22.04 单网卡 virt 虚拟机桥接配置样例

先说一下情况，我的宿主机是Ubuntu、虚拟机里的系统也是 Ubuntu，宿主机只有一个网口 enp8s0，IP网段是 192.168.0.1/24 这个范围。

目的能够在局域网内访问到宿主机和宿主机中的虚拟机

宿主机的 /etn/netplan/01-xxx.yaml 文件：

network:
  version: 2
  renderer: networkd
  ethernets:
    enp8s0:
      dhcp4: false
  bridges:
    br0:
      dhcp4: false
      addresses:
      - 192.168.0.110/24
      nameservers:
        addresses:
        - 192.168.0.1
      gateway4: 192.168.0.254
      interfaces:
      - enp8s0

virt 虚拟机使用桥接网络，填写br0，里面的虚拟机同样使用/etn/netplan/01-xxx.yaml 文件配置的是同网段的静态IP，虚拟机中的配置如下：

network:
  ethernets:
    enp1s0:
      addresses:
        - 192.168.0.102/24
      routes:
        - to: default
          via: 192.168.0.254
      nameservers:
        addresses: [192.168.0.1]
  version: 2

此时不需要关心linux桌面版界面显示的网络，因为即便通过界面关闭了所有网络，也还是可以访问通网络。以ifconfig命令返回的网络ip为准，如下：

enp8s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 40:b0:76:0c:8d:88  txqueuelen 1000  (Ethernet)
        RX packets 177147  bytes 92730359 (92.7 MB)
        RX errors 0  dropped 17  overruns 0  frame 0
        TX packets 76111  bytes 19083108 (19.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.110  netmask 255.255.255.0  broadcast 192.168.0.255
        ether b2:fc:10:14:00:17  txqueuelen 1000  (Ethernet)
        RX packets 93695  bytes 46142436 (46.1 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 59328  bytes 25469476 (25.4 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0