https://blog.khmersite.net/tags/netcat/ Recent content in Netcat on Kenno's Open Note https://blog.khmersite.net/%3Clink%20or%20path%20of%20image%20for%20opengraph,%20twitter-cards%3E https://blog.khmersite.net/%3Clink%20or%20path%20of%20image%20for%20opengraph,%20twitter-cards%3E Hugo -- 0.154.0 en Wed, 17 Jul 2024 20:13:16 +1000 https://blog.khmersite.net/p/how-to-test-udp-port-connectivity/ Wed, 17 Jul 2024 20:13:16 +1000 https://blog.khmersite.net/p/how-to-test-udp-port-connectivity/ <p>Earlier today, I have a need to check for a UDP opening port on a remote Linux server. And I felt blank in my brain, like I never done this before. Then I remember with TCP, I could use <code>nc</code> command to check it. Something like:</p> <pre tabindex="0"><code>➜ nc -vz opnsense 22 Ncat: Version 7.92 ( https://nmap.org/ncat ) Ncat: Connection to 2400:a888:333:0:222:ffff:fe54:67de failed: TIMEOUT. Ncat: Trying next address... Ncat: Connection to 192.168.1.1 failed: TIMEOUT. Ncat: Trying next address... Ncat: TIMEOUT. </code></pre><p>The above output indicates that there is a failed connection between my computer to the remote host &lsquo;opnsense&rsquo; on port 22.</p>