Continuous nc data acquisition fails ocassionally Post: 303019401

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Top Forums Shell Programming and Scripting Continuous nc data acquisition fails ocassionally Post 303019401 by Corona688 on Thursday 28th of June 2018 03:17:19 PM

06-28-2018

Registered User

GOT IT! If you want to send to nc more than once, you always have to do so from the same source port and IP. Otherwise nc will think you're a different sender and ignore it. And the source port is randomly chosen, unless you give the sender one with -p...

I have 192.168.0.126:19999 as the receiver here, and 192.168.0.150:20000 as the sender.

Receiving:

Code:

$ nc -u -l -p 20000 192.168.0.150 19999
asdf
asdf
...

Sending:

Code:

$ echo asdf | nc -p 19999 -u -w 1 192.168.0.126 20000
$ echo asdf | nc -p 19999 -u -w 1 192.168.0.126 20000
$

Note that the sender is not quitting at end-of-line, it's quitting at end-of-file, so should still be able to handle a long, slow stream.

Last edited by Corona688; 06-28-2018 at 06:09 PM..

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LEARN ABOUT CENTOS

unbound-streamtcp

unbound-streamtcp(1)						      unbound						      unbound-streamtcp(1)

NAME

       unbound-streamtcp - unbound DNS lookup utility

SYNOPSIS

       unbound-streamtcp [-unsh] [-f ipaddr[@port]] name type class

DESCRIPTION

       unbound-streamtcp sends a DNS Query of the given type and class for the given name to the DNS server over TCP and displays the response.

       If  the	server to query is not given using the -f option then localhost (127.0.0.1) is used. More queries can be given on one commandline,
       they are resolved in sequence.

       The available options are:

       name   This name is resolved (looked up in the DNS).

       type   Specify the type of data to lookup.

       class  Specify the class to lookup for.

       -u     Use UDP instead of TCP. No retries are attempted.

       -n     Do not wait for the answer.

       -s     Use SSL.

       -h     Print program usage.

       -f ipaddr[@port]
	      Specify the server to send the queries to. If not specified localhost (127.0.0.1) is used.

EXAMPLES

       Some examples of use.

       $ unbound-streamtcp www.example.com A IN

       $ unbound-streamtcp -f 192.168.1.1 www.example.com SOA IN

       $ unbound-streamtcp -f 192.168.1.1@1234 153.1.168.192.in-addr.arpa. PTR IN

EXIT CODE

       The unbound-streamtcp program exits with status code 1 on error, 0 on no error.

AUTHOR

       This manual page was written by Tomas Hozza <thozza@redhat.com>.

NLnet Labs							   Mar 21, 2013 					      unbound-streamtcp(1)