ubuntu动态IP

取消DNS配置还原‌（/etc/resolv.conf）

sudo systemctl stop systemd-resolved
sudo systemctl disable systemd-resolved
sudo rm /etc/resolv.conf # 删除软链接
sudo vim /etc/resolv.conf # 手动写入DNS（如nameserver 8.8.8.8）
sudo chattr +i /etc/resolv.conf # 锁定文件防修改

取消网络配置重置‌（Ubuntu 22.04+）
sudo nano /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
添加内容：network: {config: disabled}

ip link show
sudo ip link set ens33 up
ip link show ens33

sudo nano /etc/netplan/01-netcfg.yaml

network:
version: 2
ethernets:
ens33:
dhcp4: true
optional: false

sudo netplan apply
ip addr show ens33

vi /etc/resolv.conf
nameserver 8.8.8.8 # Google DNS
nameserver 1.1.1.1 # Cloudflare DNS

apt update
curl www.baidu.com