linux dns解析错误

nameserver 8.8.8.8
nameserver 8.8.4.4

ping 8.8.8.8

sudo iptables -L -v -n | grep 53

sudo systemd-resolve --flush-caches

sudo systemctl restart NetworkManager

nameserver 1.1.1.1  # Cloudflare DNS
nameserver 8.8.8.8  # Google DNS

#!/bin/bash

# 检查 /etc/resolv.conf 文件
if ! grep -q "nameserver" /etc/resolv.conf; then
    echo "No nameservers found in /etc/resolv.conf"
    echo "Adding Google DNS servers..."
    echo "nameserver 8.8.8.8" | sudo tee -a /etc/resolv.conf
    echo "nameserver 8.8.4.4" | sudo tee -a /etc/resolv.conf
fi

# 测试DNS解析
if ! nslookup google.com &> /dev/null; then
    echo "DNS resolution failed. Flushing caches and restarting network service..."
    sudo systemd-resolve --flush-caches
    sudo systemctl restart NetworkManager
fi

echo "DNS configuration checked and possibly fixed."