03-17-2020
I would like to try and answer your question but I'm completely confused. We need a lot more information to even start to think about it.
However, let me state a couple of facts here (to prompt you to tell us more).
1. Your laptop ip address is 192.168.8.149 and your server address is 192.168.121.72 so if your subnet mask is (typical) 255.255.255.0 then these two addresses are NOT on the same network and so your laptop will send the connection request to its configured gateway. (You could try changing your laptop ip address to 192.168.121.xxx to see if it connects then).
2. You specify a port number on a connection command line when you know that there is a listener on that port number at the other end for the network protocol/service that you are using. If you have a particular service listening on port 8081 then that port number is not also going to work for telnet protocol. By default (ie, without specifying a port number) telnet uses port 23. So you would not specify a different port number on a telnet command line unless you KNOW that a telnet listener is configured on port 8081 at the other end. Telnet will fail to connect otherwise.
If you know all this already then I apologize for not understanding your question but please provide much more information.
Q: Can you ping your target ip address? If that fails then fix that first.
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LEARN ABOUT PHP
socket-context-options
SOCKET-CONTEXT-OPTIONS(3) 1 SOCKET-CONTEXT-OPTIONS(3)
Socket context options - Socket context option listing
Socket context options are available for all wrappers that work over sockets, like tcp, http and ftp.
o $bindto
- Used to specify the IP address (either IPv4 or IPv6) and/or the port number that PHP will use to access the network. The syntax
is ip:port for IPv4 addresses, and [ip]:port for IPv6 addresses. Setting the IP or the port to 0 will let the system choose the IP
and/or port.
Note
As FTP creates two socket connections during normal operation, the port number cannot be specified using this option.
o $backlog
- Used to limit the number of outstanding connections in the socket's listen queue.
Note
This is only applicable to stream_socket_server(3).
+--------+-----------------+
|Version | |
| | |
| | Description |
| | |
+--------+-----------------+
| 5.3.3 | |
| | |
| | Added backlog. |
| | |
| 5.1.0 | |
| | |
| | Added bindto. |
| | |
+--------+-----------------+
Example #1
Basic $bindto usage example
<?php
// connect to the internet using the '192.168.0.100' IP
$opts = array(
'socket' => array(
'bindto' => '192.168.0.100:0',
),
);
// connect to the internet using the '192.168.0.100' IP and port '7000'
$opts = array(
'socket' => array(
'bindto' => '192.168.0.100:7000',
),
);
// connect to the internet using the '2001:db8::1' IPv6 address
// and port '7000'
$opts = array(
'socket' => array(
'bindto' => '[2001:db8::1]:7000',
),
);
// connect to the internet using port '7000'
$opts = array(
'socket' => array(
'bindto' => '0:7000',
),
);
// create the context...
$context = stream_context_create($opts);
// ...and use it to fetch the data
echo file_get_contents('http://www.example.com', false, $context);
?>
PHP Documentation Group SOCKET-CONTEXT-OPTIONS(3)