The method of the Linux system test port connectivity
There are four common methods:
1. Method Telnet
2. wget Method
3. ssh Method
4. curl Method
The following introduced one by one.
1. telnet
Usage: Telnet IP Port
(. 1) connected to the port does not exist
Telnet 1.1.1.1. 8
the Trying 1.1.1.1 ...
Telnet: Connect to address 1.1.1.1: Connection Timed OUT
port (2) existing connections
telnet 1.1. 8000 1.1
Trying 1.1.1.1 ...
Connected to 1.1.1.1.
Escape Character IS '^]'.
Connection Closed by Foreign Host.
2. wget
Usage: wget IP: Port
(. 1) connected to the port does not exist
wget 1.1.1.1:8
--2017-01-24. 11: 38 is: Connecting to 1.1 34-- http://1.1.1.1:8/ .1.1: 8 ...
failed The:. Connection Retrying the Timed OUT.
(2) the presence of a port connected
wget 1.1.1.1:8000
--2017-01-24. 11: 39: 03-- http://1.1.1.1:8000/
Connecting ... Connected to 1.1.1.1:8000.
The HTTP request sent, awaiting response ... 200 OK
3. ssh
Usage: SSH username @ ip Port -v -p
-v debug mode (print journal)
-p specifies the port
where the test is not given, left to the reader test.
4. curl
Usage: curl IP: Port
(. 1) connected to the port does not exist
no results.
(2) the presence of a connection port
curl 1.1.1.1:8000
<! DOCTYPE HTML>
<HTML>
<head> XXX </ head>
<body>
......
</ body>
</ HTML>
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