Tell me. to test TCP and UDP ports


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Tell me. to test TCP and UDP ports.
With the possibility of sending data manually to the port (for example, to test HTTP it is sometimes useful to drive the request headers).
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netcat can do everything that you need.
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> Tell me. to test TCP and UDP ports.
\r
nmap, telnet
\r
> With the possibility of sending data manually to the port (for example, for testing
> HTTP is sometimes useful to drive the request headers).
\r
curl, wget, telnet
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nmap crossplatformed and that does it. By itself, it is a console, but there are GUI. For example, under Windows you can use Zenmap. If I remember correctly — it is included in the installation package.
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You can still nc.
To send data:
echo "GET /" | nc localhost 80
Listen to:
nc-l localhost 8080
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