发现个奇怪现象，tcp 入站不通，但是 udp 入站又是通的。已经排除了本地防火墙问题，同样设置，更换电信宽带，入站是好的。
root@localhost:~# nmap xxx.asuscomm.com -p 3389
Starting Nmap 7.93 ( https://nmap.org ) at 2025-02-24 22:23 CST
Nmap scan report for x.asuscomm.com (223.167.x.x)
Host is up (0.065s latency).
PORT STATE SERVICE
3389/tcp filtered ms-wbt-server
Nmap done: 1 IP address (1 host up) scanned in 1.14 seconds
root@localhost:~# nmap xxx.asuscomm.com -p 3389 -sU
Starting Nmap 7.93 ( https://nmap.org ) at 2025-02-24 22:23 CST
Nmap scan report for xxx.asuscomm.com (223.167.x.x)
Host is up (0.064s latency).
PORT STATE SERVICE
3389/udp closed ms-wbt-server
Nmap done: 1 IP address (1 host up) scanned in 0.58 seconds
root@localhost:~# |
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