VPS里IPv6送中IPv4原生进行Youtube分流的Singbox服务端配置

VPS是双栈，有IPV6和IPV4，经检测发现IPV4是没有送中，IPV6是送中的。送中后观看youtube就会没有广告，一部分人会比较喜欢。有些设备是默认IPV4优先的，这样就不能使用IPV6和Youtube连接，从而达到无广告的效果。

检测IP有没有送中：

curl -4 -s "https://www.google.com/search?q=1" 
curl -6 -s "https://www.google.com/search?q=1" 
# 对ipv4和ipv6分别进行检测，返回一大堆代码说明没有送中，返回有302、www.google.com.hk等说明已经送中。

经过一番研究，成功实现了观看Youtube无广告，无关客户端是哪个协议优先。Youtube只走送中的ipv6。本例中还含有中转其他服务器的配置。

服务端配置如下：

// 1、建立一个专门的outband用于youtube出站，这里为 onlyipv6，里面要配置domain_resolver ，只解析ipv6
// 2、建立路由规则，1个规则屏蔽ipv4对youtube的出站，实际没有用，还是走了direct。singbox本身不支持出站只走ipv6
//    另1个规则指定youtube规则集走专门的 onlyipv6 出站，也就是对youtube集合里的域名只解析ipv6，服务端会对youtube发起ipv6请求
{
  "log": {
    "disabled": false,
    "level": "warn",
    "timestamp": true
  }, 
  
  "dns": {
    "servers": [
      {
        "type": "local",
        "tag": "defaultdns",
        "detour": "directout"
      }
    ],
    "final": "defaultdns",
    "strategy": "prefer_ipv4"
  },
  
  "inbounds": [
    {
      "type": "shadowsocks",
      "tag": "ss-in",
      "listen": "::",
      "listen_port": 1222,
      "tcp_fast_open": true,
      "method": "2022-blake3-aes-128-gcm",
      "password": "your password",
      "multiplex": {
        "enabled": true,
        "padding": true,  //开multiplex就必须开启，否则测速有问题
        "brutal": {
            "enabled": false,
            "up_mbps": 1000,
            "down_mbps": 1000
        }
      }
    },
    {
      "type": "shadowsocks",
      "tag": "ss-zz-in",
      "listen": "::",
      "listen_port": 2111,
      "tcp_fast_open": true,
      "method": "2022-blake3-aes-128-gcm",
      "password": "your password",
      "multiplex": {
        "enabled": true,
        "padding": true,
        "brutal": {
            "enabled": false,
            "up_mbps": 1000,
            "down_mbps": 1000
        }
      }
    } 
  ],
  "outbounds": [
    {
      "type": "direct",
      "tag": "directout",
      "routing_mark": 100
    },
    {
      "type": "direct",
      "tag": "onlyipv6",
      "domain_resolver": {  //覆盖default_domain_resolver的ipv4优先
        "server": "defaultdns",
        "strategy": "ipv6_only",
        "disable_cache": false    
        },
      "routing_mark": 100
    },     
    {
      "type": "shadowsocks",
      "tag": "ss_upstream",
      "server": "1.2.3.4",
      "server_port": 9527,
      "method": "2022-blake3-aes-128-gcm",
      "password": "your password"
    }           
  ],  
  "route": {
    "rules": [
      {
        "action": "sniff"
      },
      {
        "protocol": [
          "bittorrent",
          "quic"
        ],
        "action": "reject",
        "method": "default"
      },
      {
        "protocol": "dns",
        "action": "hijack-dns"
      },      
      {
        "inbound": [
          "ss-zz-in"
        ],
        "outbound": "ss_upstream"
      },
      {
        // 规则对ipv4出站就屏蔽，实际并没有用，
        "ip_version": 4,
        "rule_set": [
          "geosite_youtube"
        ],
        "outbound": "block"     
      },
      {
        // 让youtube规则集合 走只能解析ipv6的出站
        "rule_set": [
          "geosite_youtube"
        ],
        "outbound": "onlyipv6"      
      }
      
    ],  
    "rule_set": [
      {
        "tag": "geosite_youtube",
        "type": "remote",
        "format": "source",
        "url": "https://raw.githubusercontent.com/MetaCubeX/meta-rules-dat/refs/heads/sing/geo/geosite/youtube.json",
        "download_detour": "directout",
        "update_interval": "5d"
      }
    ],
    "default_domain_resolver": {
      "server": "defaultdns",
      "strategy": "prefer_ipv4"
    }
  }
}

实际测试下来，访问www.google.com，左下角提示地区为美国，没有跳转到 www.google.com.hk ；访问 www.youtube.com/red 提示 YouTube Premium 在你所在的国家/地区尚未推出 。