Linux/Mac-20180729-telnet udp口？

Problem

想測試 udp 端口連通性，但是 telnet 連接被拒絕，用 telnet 似乎不對。

Solution

appledeMacBook-Pro:~ xxx$ nc -vuz x.x.x.x 514
found 0 associations
found 1 connections:
     1: flags=82<CONNECTED,PREFERRED>
    outif (null)
    src x.x.x.x port 52491
    dst x.x.x.x port 514
    rank info not available

Connection to x.x.x.x port 514 [udp/syslog] succeeded!

說明該 udp 端口正常監聽。

Reference

測試udp 端口是否開放