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This article introduces the knowledge of "how to test the udp port of Linux". In the operation of practical cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First, tenlnet test tcp [root@test ~] # telnet 192.168.209.121 123 Trying 192.168.209.121 … Telnet: connect to address 192.168.209.121: Connection refused telnet: Unable to connect to remote host: Connection refused, as shown above, is the case where the connection is rejected. Proof that it is not bugged or walled. The case classes for normal connections are as follows:

# telnet 192.168.209.121 110 + OK Dovecot ready. The above shows the normal connection of a mail server.

II. Nc test udp port installation nc

Yum install-y nc test

[root@test ~] # nc-vuz 192.168.209.121 123 Connection to 192.168.209.121 123 port [udp/ntp] succeeded! In actual use, you can only use the-u parameter,-u represents the udp protocol,-v represents the detailed mode, and-z represents only the monitoring port and does not send data.

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