Linux/Mac-20180729-telnet udp口？

Problem

想测试 udp 端口连通性，但是 telnet 连接被拒绝，用 telnet 似乎不对。

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!

说明该 udp 端口正常监听。

Reference

测试udp 端口是否开放