How to use the batch host service scanning tool netcat for common network tools in Linux
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Netcat, also known as Swiss Army knife, is a network tool commonly used by hackers and system administrators. At first, it was developed for file transfer, but later developed many powerful functions, such as the ability to scan batch host services.
Earlier, I introduced another more commonly used bulk host service scanning tool: nmap.
The installation of netcat is also very simple, direct yum installation:
The code is as follows:
Yum install nc
Generally speaking, it is not recommended to install nc in the production environment, because nc can not only scan the host service in batches, but also support port agents and file transfer, which can easily cause security risks.
Batch host service scanning of netcat
Parameters commonly used by netcat when scanning:
-w set the timeout
-z input / output mode
-v displays the execution of the command
Common commands:
TCP protocol
The code is as follows:
Nc-v-z-w2 192.168.2.224 1-50
UDP protocol
The code is as follows:
Nc-v-z-W2-u 192.168.2.224 1-50
File transfer of netcat
Netcat can specify a local port number to enable listening mode, and the client can use the same port opened by the netcat connection to send messages, which will be displayed on the server.
Turn on monitoring
The code is as follows:
Nc-l 2389
Establish a connection
The code is as follows:
Nc localhost 2389
If the server output is redirected to a file, it can be used for file transfer:
The code is as follows:
Nc-l 2389 > test
Transfer file
The code is as follows:
Cat testfile | nc localhost 2389
If you are testing on a server, you can use & to switch nc to a background task while running client commands.
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