所有 UDP 连接都以 TCP 为前缀。为什么?
$ ss-lunt Netid 状态 Recv-Q Send-Q 本地地址:端口 对等地址:端口 tcp UNCONN 0 0 *:514 *:* tcp UNCONN 0 0 *:68 *:* tcp UNCONN 0 0 10.0.2.15:123 *:* tcp UNCONN 0 0 127.0.0.1:123 *:* tcp 未连接 0 0 *:123 *:* tcp UNCONN 0 0 *:5353 *:* tcp UNCONN 0 0 *:53620 *:* tcp UNCONN 0 0 *:59885 *:* tcp UNCONN 0 0 :::514 :::* tcp UNCONN 0 0 :::48693 :::* tcp UNCONN 0 0 fe80::a00:27ff:fe13:a1df:123 :::* tcp UNCONN 0 0 ::1:123 :::* tcp UNCONN 0 0 :::123 :::* tcp UNCONN 0 0 :::56496 :::* tcp UNCONN 0 0 :::5353 :::* tcp 监听 0 128 127.0.22.1:22 *:* tcp 监听 0 128 127.0.80.1:443 *:* tcp 监听 0 128 127.0.80.1:80 *:*