解决方案:
启用 IP 转发(用于支持不同网卡间的通信)。编辑 /etc/sysctl.conf 文件,确保以下内容被取消注释:

net.ipv4.ip_forward = 1

执行以下命令使配置生效:

sudo sysctl -p

ubuntu20.04版本的网络配置

cat /etc/netplan/00-installer-config.yaml 


# This is the network config written by 'subiquity'
network:
  ethernets:
    ens3:
      addresses:
      - 192.168.1.80/24
      gateway4: 192.168.1.1
      nameservers:
        addresses:
        - 192.168.1.1
      routes:
        - to: default
          via: 192.168.1.1
          metric: 100

    ens4:
      #dhcp4: true
      addresses:
      - 192.168.8.80/24
      gateway4: 192.168.8.1
      nameservers:
        addresses:
        - 192.168.8.1
      #routes: []
      routes:
        - to: default
          via: 192.168.8.1
          metric: 200
  version: 2

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