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基线（浏览器 → sh-01）：下行 15.1 Mbps，上行 79.4 Mbps","detail":"这是浏览器能达到的全部。本次没有测任何其他端口，因此不能就「某个端口是否被限速」作出任何判断 —— 那需要同链路的对照端口和逐秒序列。","confidence":"low","evidence":["仅测量 TCP/443（HTTPS）","无对照端口，未做整形检测","节点单流上限 15 Mbps：数字触顶只说明链路至少有这么快"],"control_ports":null},"method":{"timing":"按时长计时（浏览器到点截断），非按字节","duration_ms":10000,"streams":1,"bucket_ms":100,"rate_limit":"节点单流上限 15 Mbps","control_ports":"","clock":"浏览器 performance.now()（单调时钟）","notes":"浏览器沙箱内测量，目标为测速节点 sh-01 的 HTTPS/443；端口级结论需本地客户端"},"public":true,"untested":[{"capability":"任意 TCP 端口","reason":"浏览器只会说 HTTPS：3389、5060、游戏端口上跑的真实协议，它一概碰不到"},{"capability":"裸 UDP 吞吐","reason":"WebRTC 之外发不出裸 UDP 包，RDP / 游戏 / 音视频的真实上限测不到"},{"capability":"端口整形检测","reason":"需要逐秒吞吐序列与同链路对照端口，JS 计时被缓冲和 TLS 层抹平"},{"capability":"逐跳归因","reason":"需要构造 TTL 递增的 SYN 包，浏览器碰不到 IP 层"},{"capability":"TCP 重传与 cwnd","reason":"rtt / retrans / snd_cwnd / delivery_rate 是内核态数据，JS 读不到"},{"capability":"MTU 黑洞探测","reason":"需要控制包长与 DF 标志位，浏览器无此能力"}]}