Check UDP port

在Linux下使用nmap檢查UDP port是否有開
[root@mail ~]# nmap -p 514 -sU -P0 192.168.1.6

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2011-06-20 10:25 CST
Interesting ports on mail.gits.com.tw (192.168.1.6):
PORT STATE SERVICE
514/udp open|filtered syslog