关于TUN在依赖第三方端口转发功能时的异常

[Kc2353]

由于本人技术水平不高，希望大佬指出问题所在，v26.3.27
按照V2rayN默认设置，Xray-core的TUN无法正确连接（依赖第三方程序的端口转发）127.0.0.1:port，而直接连接服务器对应端口正常，第三方程序提供的隧道工作正常，疑似该配置下TUN未正确处理回环IP。
客户端配置：

Details

{
  "log": {
    "loglevel": "info"
  },
  "dns": {
    "hosts": {
      "dns.google": [
        "8.8.8.8",
        "8.8.4.4",
        "2001:4860:4860::8888",
        "2001:4860:4860::8844"
      ],
      "dns.alidns.com": [
        "223.5.5.5",
        "223.6.6.6",
        "2400:3200::1",
        "2400:3200:baba::1"
      ],
      "one.one.one.one": [
        "1.1.1.1",
        "1.0.0.1",
        "2606:4700:4700::1111",
        "2606:4700:4700::1001"
      ],
      "1dot1dot1dot1.cloudflare-dns.com": [
        "1.1.1.1",
        "1.0.0.1",
        "2606:4700:4700::1111",
        "2606:4700:4700::1001"
      ],
      "cloudflare-dns.com": [
        "104.16.249.249",
        "104.16.248.249",
        "2606:4700::6810:f8f9",
        "2606:4700::6810:f9f9"
      ],
      "dns.cloudflare.com": [
        "104.16.132.229",
        "104.16.133.229",
        "2606:4700::6810:84e5",
        "2606:4700::6810:85e5"
      ],
      "dot.pub": [
        "1.12.12.12",
        "120.53.53.53"
      ],
      "doh.pub": [
        "1.12.12.12",
        "120.53.53.53"
      ],
      "dns.quad9.net": [
        "9.9.9.9",
        "149.112.112.112",
        "2620:fe::fe",
        "2620:fe::9"
      ],
      "dns.yandex.net": [
        "77.88.8.8",
        "77.88.8.1",
        "2a02:6b8::feed:0ff",
        "2a02:6b8:0:1::feed:0ff"
      ],
      "dns.sb": [
        "185.222.222.222",
        "2a09::"
      ],
      "dns.umbrella.com": [
        "208.67.220.220",
        "208.67.222.222",
        "2620:119:35::35",
        "2620:119:53::53"
      ],
      "dns.sse.cisco.com": [
        "208.67.220.220",
        "208.67.222.222",
        "2620:119:35::35",
        "2620:119:53::53"
      ],
      "engage.cloudflareclient.com": [
        "162.159.192.1"
      ]
    },
    "servers": [
      {
        "address": "https://cloudflare-dns.com/dns-query",
        "domains": [
          "domain:cloudflare-dns.com",
          "domain:one.one.one.one",
          "domain:dns.google",
          "domain:adguard-dns.com",
          "domain:opendns.com",
          "domain:umbrella.com",
          "domain:quad9.net",
          "domain:yandex.net"
        ],
        "skipFallback": true
      },
      {
        "address": "https://dns.google/dns-query",
        "domains": [
          "domain:cloudflare-dns.com",
          "domain:one.one.one.one",
          "domain:dns.google",
          "domain:adguard-dns.com",
          "domain:opendns.com",
          "domain:umbrella.com",
          "domain:quad9.net",
          "domain:yandex.net"
        ],
        "skipFallback": true
      },
      {
        "address": "8.8.8.8",
        "domains": [
          "domain:cloudflare-dns.com",
          "domain:one.one.one.one",
          "domain:dns.google",
          "domain:adguard-dns.com",
          "domain:opendns.com",
          "domain:umbrella.com",
          "domain:quad9.net",
          "domain:yandex.net"
        ],
        "skipFallback": true
      },
      {
        "address": "1.1.1.1",
        "domains": [
          "geosite:private"
        ],
        "skipFallback": true,
        "tag": "direct-dns-1"
      },
      {
        "address": "1.2.4.8",
        "domains": [
          "geosite:private"
        ],
        "skipFallback": true,
        "tag": "direct-dns-2"
      },
      {
        "address": "119.29.29.29",
        "domains": [
          "geosite:private"
        ],
        "skipFallback": true,
        "tag": "direct-dns-3"
      },
      {
        "address": "223.5.5.5",
        "domains": [
          "geosite:private"
        ],
        "skipFallback": true,
        "tag": "direct-dns-4"
      },
      {
        "address": "119.29.29.29",
        "domains": [
          "full:cloudflare-dns.com",
          "full:dns.google"
        ],
        "skipFallback": true
      },
      {
        "address": "1.1.1.1",
        "skipFallback": false,
        "tag": "direct-dns-5"
      },
      {
        "address": "1.2.4.8",
        "skipFallback": false,
        "tag": "direct-dns-6"
      },
      {
        "address": "119.29.29.29",
        "skipFallback": false,
        "tag": "direct-dns-7"
      },
      {
        "address": "223.5.5.5",
        "skipFallback": false,
        "tag": "direct-dns-8"
      }
    ],
    "serveStale": true,
    "enableParallelQuery": true,
    "tag": "dns-module"
  },
  "inbounds": [
    {
      "tag": "socks",
      "port": 7890,
      "listen": "127.0.0.1",
      "protocol": "mixed",
      "sniffing": {
        "enabled": true,
        "destOverride": [
          "http",
          "tls"
        ],
        "routeOnly": false
      },
      "settings": {
        "auth": "noauth",
        "udp": true,
        "allowTransparent": false
      }
    },
    {
      "tag": "tun",
      "protocol": "tun",
      "sniffing": {
        "enabled": true,
        "destOverride": [
          "http",
          "tls"
        ],
        "routeOnly": false
      },
      "settings": {
        "name": "xray_tun",
        "MTU": 9000,
        "gateway": [
          "172.18.0.1/30",
          "fdfe:dcba:9876::1/126"
        ],
        "autoSystemRoutingTable": [
          "0.0.0.0/0",
          "::/0"
        ],
        "autoOutboundsInterface": "auto"
      }
    },
    {
      "tag": "api",
      "port": 7894,
      "listen": "127.0.0.1",
      "protocol": "dokodemo-door",
      "settings": {
        "address": "127.0.0.1"
      }
    }
  ],
  "outbounds": [
    {
      "tag": "proxy",
      "protocol": "vless",
      "targetStrategy": "UseIPv4v6",
      "settings": {
        "vnext": [
          {
            "address": "127.0.0.1",
            "port": 1280,
            "users": [
              {
                "id": "id",
                "email": "t@t.tt",
                "security": "auto",
                "encryption": "mlkem768x25519plus.native.0rtt.xxxxxxx",
                "flow": "xtls-rprx-vision-udp443"
              }
            ]
          }
        ]
      },
      "streamSettings": {
        "network": "raw"
      },
      "mux": {
        "enabled": false,
        "concurrency": -1
      }
    },
    {
      "tag": "direct",
      "protocol": "freedom",
      "settings": {
        "domainStrategy": "UseIPv4v6",
        "userLevel": 0
      }
    },
    {
      "tag": "block",
      "protocol": "blackhole"
    },
    {
      "tag": "dns",
      "protocol": "dns"
    }
  ],
  "routing": {
    "domainStrategy": "AsIs",
    "rules": [
      {
        "type": "field",
        "inboundTag": [
          "api"
        ],
        "outboundTag": "api"
      },
      {
        "port": "135,137-139,5353",
        "network": "udp",
        "outboundTag": "block"
      },
      {
        "outboundTag": "block",
        "ip": [
          "224.0.0.0/3",
          "ff00::/8"
        ]
      },
      {
        "port": "53",
        "outboundTag": "dns",
        "process": [
          "v2ray.exe",
          "mihomo-windows-amd64-v1.exe",
          "mihomo-windows-amd64-compatible.exe",
          "mihomo-windows-amd64.exe",
          "mihomo-windows-arm64.exe",
          "clash.exe",
          "mihomo.exe",
          "hysteria.exe",
          "naive.exe",
          "naiveproxy.exe",
          "tuic-client.exe",
          "tuic.exe",
          "sing-box-client.exe",
          "sing-box.exe",
          "juicity-client.exe",
          "juicity.exe",
          "hysteria-windows-amd64.exe",
          "hysteria-linux-amd64.exe",
          "brook_windows_amd64.exe",
          "brook_linux_amd64.exe",
          "brook.exe",
          "overtls-bin.exe",
          "overtls.exe",
          "shadowquic.exe",
          "mieru.exe"
        ]
      },
      {
        "outboundTag": "direct",
        "process": [
          "v2ray.exe",
          "xray.exe",
          "mihomo-windows-amd64-v1.exe",
          "mihomo-windows-amd64-compatible.exe",
          "mihomo-windows-amd64.exe",
          "mihomo-windows-arm64.exe",
          "clash.exe",
          "mihomo.exe",
          "hysteria.exe",
          "naive.exe",
          "naiveproxy.exe",
          "tuic-client.exe",
          "tuic.exe",
          "sing-box-client.exe",
          "sing-box.exe",
          "juicity-client.exe",
          "juicity.exe",
          "hysteria-windows-amd64.exe",
          "hysteria-linux-amd64.exe",
          "brook_windows_amd64.exe",
          "brook_linux_amd64.exe",
          "brook.exe",
          "overtls-bin.exe",
          "overtls.exe",
          "shadowquic.exe",
          "mieru.exe",
          "xray/",
          "self/"
        ]
      },
      {
        "port": "53",
        "outboundTag": "dns"
      },
      {
        "type": "field",
        "outboundTag": "block",
        "domain": [
          "geosite:facebook",
          "geosite:netflix",
          "geosite:telegram",
          "geosite:twitter",
          "keyword:x.com"
        ]
      },
      {
        "type": "field",
        "outboundTag": "block",
        "ip": [
          "geoip:facebook",
          "geoip:netflix",
          "geoip:telegram",
          "geoip:twitter"
        ]
      },
      {
        "type": "field",
        "outboundTag": "direct",
        "ip": [
          "geoip:private"
        ]
      },
      {
        "type": "field",
        "outboundTag": "direct",
        "domain": [
          "geosite:private"
        ]
      },
      {
        "type": "field",
        "outboundTag": "proxy",
        "process": [
          "VboxNetNAT.exe",
          "VBoxNetNAT",
          "java",
          "javaw"
        ]
      },
      {
        "type": "field",
        "outboundTag": "proxy",
        "domain": [
          "domain:cloudflare-dns.com",
          "domain:one.one.one.one",
          "domain:dns.google",
          "domain:adguard-dns.com",
          "domain:opendns.com",
          "domain:umbrella.com",
          "domain:quad9.net",
          "domain:yandex.net"
        ]
      },
      {
        "type": "field",
        "outboundTag": "proxy",
        "ip": [
          "1.1.1.1",
          "1.0.0.1",
          "2606:4700:4700::1111",
          "2606:4700:4700::1001",
          "1.1.1.2",
          "1.0.0.2",
          "2606:4700:4700::1112",
          "2606:4700:4700::1002",
          "1.1.1.3",
          "1.0.0.3",
          "2606:4700:4700::1113",
          "2606:4700:4700::1003",
          "8.8.8.8",
          "8.8.4.4",
          "2001:4860:4860::8888",
          "2001:4860:4860::8844",
          "94.140.14.14",
          "94.140.15.15",
          "2a10:50c0::ad1:ff",
          "2a10:50c0::ad2:ff",
          "94.140.14.15",
          "94.140.15.16",
          "2a10:50c0::bad1:ff",
          "2a10:50c0::bad2:ff",
          "94.140.14.140",
          "94.140.14.141",
          "2a10:50c0::1:ff",
          "2a10:50c0::2:ff",
          "208.67.222.222",
          "208.67.220.220",
          "2620:119:35::35",
          "2620:119:53::53",
          "208.67.222.123",
          "208.67.220.123",
          "2620:119:35::123",
          "2620:119:53::123",
          "9.9.9.9",
          "149.112.112.112",
          "2620:fe::9",
          "2620:fe::fe",
          "9.9.9.11",
          "149.112.112.11",
          "2620:fe::11",
          "2620:fe::fe:11",
          "9.9.9.10",
          "149.112.112.10",
          "2620:fe::10",
          "2620:fe::fe:10",
          "77.88.8.8",
          "77.88.8.1",
          "2a02:6b8::feed:0ff",
          "2a02:6b8:0:1::feed:0ff",
          "77.88.8.88",
          "77.88.8.2",
          "2a02:6b8::feed:bad",
          "2a02:6b8:0:1::feed:bad",
          "77.88.8.7",
          "77.88.8.3",
          "2a02:6b8::feed:a11",
          "2a02:6b8:0:1::feed:a11"
        ]
      },
      {
        "type": "field",
        "port": "0-65535",
        "outboundTag": "direct"
      },
      {
        "type": "field",
        "inboundTag": [
          "direct-dns-1",
          "direct-dns-2",
          "direct-dns-3",
          "direct-dns-4",
          "direct-dns-5",
          "direct-dns-6",
          "direct-dns-7",
          "direct-dns-8"
        ],
        "outboundTag": "direct"
      },
      {
        "type": "field",
        "inboundTag": [
          "dns-module"
        ],
        "outboundTag": "proxy"
      }
    ]
  },
  "metrics": {
    "tag": "api"
  },
  "policy": {
    "system": {
      "statsOutboundUplink": true,
      "statsOutboundDownlink": true
    }
  },
  "stats": {}
}

客户端日志：debug模式出现大量本地IP提示，均为169.254..，呈递增趋势，未发现其他有关信息
服务端日志：无，debug，只有程序开始监听/成功运行
服务端配置：个人认为与此无关，为标准的VLESS Encryption配置：

Details

{
  "log": {
    "loglevel": "debug"
  },
  "inbounds": [
    {
      "listen": "127.0.0.1",
      "port": 1280,
      "protocol": "vless",
      "settings": {
        "clients": [
          {
            "id": "id",
            "level": 0,
            "email": "root@localhost",
            "flow": "xtls-rprx-vision"
          }
        ],
        "decryption": "mlkem768x25519plus.native.600s.xxxx"
      },
      "sniffing": {
        "enabled": false,
        "destOverride": [
          "http",
          "tls",
          "quic"
        ],
        "routeOnly": true
      }
    }
  ],
  "outbounds": [
    {
      "protocol": "freedom",
      "settings": {}
    },
    {
      "protocol": "blackhole",
      "settings": {},
      "tag": "blocked"
    }
  ],
  "routing": {
    "domainStrategy": "IPIfNonMatch",
    "rules": [
      {
        "type": "field",
        "ip": [
          "geoip:private"
        ],
        "outboundTag": "blocked"
      }
    ]
  }
}

[dfliaoyue]

Windows平台用tun入站，建议还是使用比较新的版本（目前还是测试版？）。本来win的路由配置就麻烦，再挂一个sing-box更容易出bug。

[Kc2353]

新版已经是xray tun了，问题已经找到，是xray无法正确处理tun+127.0.0.1出站导致的，xray要求必须指定（自动选择也是，只不过由xray完成）一个网络接口用于出站，而自动选择的必然是物理网卡

[debugzxcv]

试试 #6276 ，或者像以下这样修改看看：

@@ -2,6 +2,7 @@
   "tag": "proxy",
   "protocol": "vless",
   "targetStrategy": "UseIPv4v6",
+  "sendThrough": "127.0.0.1",
   "settings": {
     "vnext": [
       {