Login or Register to Ask a Question and Join Our Community


Linux

Thank you radoulov for your help on netcat command (nc -lp)

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems Linux Thank you radoulov for your help on netcat command (nc -lp)
# 1  
Old 07-02-2011
Thank you radoulov for your help on netcat command (nc -lp)
Hello,

Thank you very much for the line nc -lp <port> . I tried to run simple chat session with nc as it's shown in catonmatDOTorg but failed miserably with that syntax inspite of opening port 7777 by iptables . But your command example is working nicely.
So a bagful of thanks Smilie)

Only one hitch. After opening a port [7777 using iptables such as iptables -A INPUT -m state --state NEW -m tcp \
-p tcp --dport 7777 --j ACCEPT ] nmap still showing the port
7777 is closed. [nmap -p 7777 localhost]

---------- Post updated at 06:00 AM ---------- Previous update was at 04:30 AM ----------

Oh! I have made a conceptual mistake. I have unblocked a port but haven't opened it as unblocking a port doesn't mean opening the port, I have just enable the port to reach for so a service can use it, When a service is running in that port,, then the port is said to be a open port[ listening for a connection]
Last edited by vectrum; 07-02-2011 at 08:09 AM..
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Emergency UNIX and Linux Support

Netcat ( nc -l ) as webserver

Dear Linux guru's I am trying to create a webserver using nc (netcat only) on RHEL 7.2 running on bash shell. now the easy thing is to get nc listing to a port and respond back $ while true; do { echo -e 'HTTP/1.0 200 OK\r\n'; set; } | nc -l 7877; done This when called from a... (3 Replies)
Discussion started by: chakrapani
3 Replies

2. UNIX for Advanced & Expert Users

Telnet vs netcat behavior

Currently I run a number of network tests using netcat that checks for an open port on a remote IP-address, using this syntax: netcat -v -w 5 -z 107.249.95.5 4488 For some reason, the netcat command above is hanging (although others work fine), but a telnet is showing a valid connection like... (4 Replies)
Discussion started by: ckmehta
4 Replies

3. IP Networking

Help with Netcat

Hi all, I know my question is regarding Windows and not Linux, but I simply need people who know Netcat pretty well and I'm guessing here is a good place for that. So on with my question. I'm doing some research, and I was playing around with netcat on a WinXP VM but I can't seem to get... (0 Replies)
Discussion started by: MrCrumbs
0 Replies

4. Shell Programming and Scripting

Post using nc(netcat)

Hi; I have a url like http://localhost:8080/examples/jsp/dates/nextPageToPost.jsp?name=ajay&password=pas&sex=Male&check=on&nationality=USA&description=aa&submit=submit in which i want to use nc for http post for parameters like "name","password"....etc can neone please help me how to do that... (3 Replies)
Discussion started by: ajaypadvi
3 Replies

5. Solaris

Please help me to install netcat on solaris

hello guys, i want to install netcat on my solaris. after i tar and gunzip netcat i'm confuse what do i must to do ? please help me to install netcat on my solaris. I'm beginner :( (2 Replies)
Discussion started by: praset
2 Replies

6. Solaris

For Radoulov

Hi , I have got your reply but i have this condition .AS my database is down for more than 6 hours on a particular sunday of the month so i am checking its availability. for i in 1 2 3 4 do Get_Mv_Count #fetches the value from remote DB case $TR in "" | ** )... (1 Reply)
Discussion started by: megh
1 Replies

7. Shell Programming and Scripting

netcat

Is there a way how to react on the message a client sent to the server? I would like as the client sent message to server: "get information such and such" and server would answer. Thank you for reply! (6 Replies)
Discussion started by: MartyIX
6 Replies

8. UNIX for Advanced & Expert Users

Netcat with Authentication?

I'd like to do a data transfer without encryption but with a guarantee that my data comes from a legit source. I'm thinking something that uses a public key scheme to sign the data. Does anyone know of something like that? Thanks! -Pileofrogs (1 Reply)
Discussion started by: pileofrogs
1 Replies

9. Programming

netcat like file transfer

Hi Folks I am not a c programmer .But i need help in writing a program which can do this any ideas on how to go about it . i start a server on the target server where files need to be copied start-server -port 5006 & ---start the server and listen it on a partcular port on the source... (2 Replies)
Discussion started by: linuxdba
2 Replies
Login or Register to Ask a Question

LEARN ABOUT DEBIAN

bntext

bntext(5)							File Formats Manual							 bntext(5)

NAME

       bnmotd.txt, bnnews.txt bnissue.txt - messages for the Unix Battle.net daemon

DESCRIPTION

       The file bnmotd.txt contains text displayed by bnetd(1), when users first log into the server.

       The file bnnews.txt contains text displayed when the user uses the /news chat command.

       The  files  consist  of raw text with printf-style formatting escapes.  Each line of a file can contain a type formatter from the following
       list:

	      %B     Use the broadcast attribute (???).

	      %C     Execute the line as if the user entered it as a command.

	      %E     Use the error attribute (red).

	      %I     Use the info attribute (yellow).  This is the same was %W.

	      %M     Normal chat message (white).  This will appear as if the user said it.

	      %T     Emote chat message (???).	This will appear as if the user said it.

	      %W     Use the warning attribute (yellow).  This is the same was %I.

       Within a line, any of the following format formatters may be used:

	      %%     Expand to a literal percent sign (%).

	      %a     Expand to the number of accounts on the server.

	      %c     Expand to the number of channels on the server.  This includes all permanent and current temporary channels.

	      %g     Expand to the number of games on the server.  This includes both public and private (passworded) games.

	      %h     Expand to the hostname of the server (as returned by gethostname(2)).

	      %i     Expand to this user's account ID number, formatted with a leading pound (#) sign and leading zeros.

	      %l     Expand to this user's current chat name which is usually the same

	      %r     Expand to the IP of the remote machine (the client).

	      %t     Expand to four character client tag.

	      %u     Expand to the number of users logged into the server.

	      %v     Expand to the version number of the server.

SEE ALSO

       bnetd(1)

AUTHOR

       Ross Combs (ross@bnetd.org)

								  2 August, 2001							 bntext(5)