SFA client, ipv6 does not work

[dKenGuru]

Operating system

Android

System version

Android 16

Installation type

sing-box for Android Graphical Client

If you are using a graphical client, please provide the version of the client.

1.13.35

Version

Description

Ipv6 in tun does not work since ~.20 alpha.
Same config works on 1.12.x client.

Reproduction

Install SFA 1.13 alpha and create tun with ipv6 support

Logs

Supporter

• I am a sponsor

Integrity requirements

• I confirm that I have read the documentation, understand the meaning of all the configuration items I wrote, and did not pile up seemingly useful options or default values.
• I confirm that I have provided the server and client configuration files and process that can be reproduced locally, instead of a complicated client configuration file that has been stripped of sensitive data.
• I confirm that I have provided the simplest configuration that can be used to reproduce the error I reported, instead of depending on remote servers, TUN, graphical interface clients, or other closed-source software.
• I confirm that I have provided the complete configuration files and logs, rather than just providing parts I think are useful out of confidence in my own intelligence.

[daminit]

我可以确定的是这个 Issue 出现于 1.13-alpha.35 。我没有在 1.13-alpha.34. 以及之前的版本发现这个问题。

我这里提供一个最小的可复现配置。

{
  "log"      : {"level": "info"},
  "inbounds" : [
    {
      "type": "tun",
      "tag": "tun-in",
      "address": ["172.27.0.1/30", "fdfe:dcba:9876::1/126"],
      "auto_route": true,
      "route_exclude_address": ["10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16", "fc00::/7"]
    }
  ],
  "dns"      : {
    "servers": [ {"type": "https", "tag": "dns-resolve", "server": "223.5.5.5"} ],
    "final"  : "dns-resolve"
  },
  "route"    : {
    "rules": [ {"port": 53, "action": "hijack-dns"} ],
    "auto_detect_interface": true,
    "final": "direct"
  },
  "outbounds": [ {"type": "direct", "tag": "direct", "domain_resolver": "dns-resolve"} ]
}

将该配置导入到 SFA-alpha35 内， 同时启动。

打开 Termux 分别使用 curl ip.sb -4v 和 curl ip.sb -6v 可以查看到在 IPv4的情况下，TCP连接可以被建立，但是如果在 IPv6的情况下，TCP连接不会被建立，而 Curl 的输出始终卡在 Trying .... 阶段。

已经确认只有在 SFA 才会出现这个问题，而在只有核心的情况下无法出现。

[dKenGuru]

{
  "log": {
    "level": "warn",
    "timestamp": true
  },
  "dns": {
    "servers": [
      {
        "type": "local",
        "tag": "DNS"
      }
    ],
    "final": "DNS",
    "strategy": "prefer_ipv6"
  },
  "inbounds": [
    {
      "type": "tun",
      "address": [
        "172.19.0.1/30",
        "fdfe:dcba:9876::1/126"
      ],
      "auto_route": true,
      "strict_route": true,
      "stack": "system",
      "sniff": true
    }
  ],

This working fine in SFA 1.12.x. But not in 1.13 any last build.
Android system DNS set to CDN - one.one.one.one.