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 DEBIAN
knocker
KNOCKER(1) General Commands Manual KNOCKER(1)
NAME
knocker - An easy to use network security port scanner
SYNOPSIS
knocker --host <host> [OPTION]
DESCRIPTION
knocker is a simple and easy to use TCP security port scanner written in C using pthreads which is able to analyze hosts and all of the
different services started on them.
OPTIONS
-H, --host
host name or numeric Internet address to scan
-P, --port
port number to scan (single port scan only)
-SP, --start-port
port number to begin the scan from
-EP, --end-port
port number to end the scan at
--last-host
uses the last scanned host as target
--last-scan
performs again the last port scan
-q, --quiet
disable console output and logs to file.
-lf, --logfile <logfile>
log the results to a specified file.
-nf, --no-fency
disable fency output
-nc, --no-colors
disable colored output
--configure
let the user configure knocker
-h, --help
display this help and exit
-v, --version
output version information and exit
EXAMPLES
To run this program the standard way type:
knocker --host 192.168.0.1
If you want to specify a port range to scan:
knocker --host thehost --start-port 1 --end-port 2600
or
knocker -H thehost -SP 1 -EP 2600
To scan a single port:
knocker -H thehost --port 21
To run this program not using colors (if your terminal does not support colors):
knocker --host 192.168.0.1 --no-colors
To run this program run in background and have the results written in a log file:
knocker --host 192.168.0.1 --quiet &
AVAILABILTY
The latest version of this program can be found at http://knocker.sourceforge.net
BUGS
See the BUGS file in the knocker source package for a list of known bugs. Report bugs to <g.gabriele79@genie.it>
AUTHOR
knocker is written by Gabriele Giorgetti <g.gabriele79@genie.it>
COPYRIGHT
Copyright (C) 2001,2002 Gabriele Giorgetti
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
MAY 24, 2002 KNOCKER(1)