#!/bin/bash

echo "=== Ubuntu IPv6 基础检测 ==="

# 检查系统版本
echo "1. 系统信息:"
lsb_release -d 2>/dev/null || echo "  Ubuntu $(uname -r)"

# 检查NetworkManager状态（Ubuntu默认）
echo "2. 网络管理器状态:"
if systemctl is-active NetworkManager >/dev/null 2>&1; then
    echo "  ✓ NetworkManager 运行中"
else
    echo "  ⚠ NetworkManager 未运行"
fi

# 检查IPv6内核参数
echo "3. IPv6内核参数:"
if [[ $(cat /proc/sys/net/ipv6/conf/all/disable_ipv6 2>/dev/null) -eq 0 ]]; then
    echo "  ✓ IPv6已启用"
else
    echo "  ✗ IPv6被禁用"
fi

# 检查网络接口
echo "4. 网络接口IPv6状态:"
for iface in $(ip -o link show | awk -F': ' '{print $2}'); do
    ipv6_status=$(cat /proc/sys/net/ipv6/conf/$iface/disable_ipv6 2>/dev/null)
    if [[ $ipv6_status -eq 0 ]]; then
        echo "  ✓ $iface: IPv6已启用"
    else
        echo "  ✗ $iface: IPv6被禁用"
    fi
done

# 测试连通性
echo "5. IPv6连通性测试:"
if ping6 -c 2 -W 3 2001:4860:4860::8888 >/dev/null 2>&1; then
    echo "  ✓ IPv6外网连通正常"
else
    echo "  ✗ IPv6外网连通失败"
fi