Netcat is a simple but powerful utility program that reads and writes data across network connections, using TCP or UDP protocol, IPv4 or IPv6, with a variety of functions.

learn more… | top users | synonyms

1
vote
2answers
144 views

How to keep the reverse shell open in Netcat?

As soon as the command prompt is closed on the target machine the reverse shell is closed on the client machine. Is there any way to keep the port open and Netcat working after the target machine ...
1
vote
2answers
1k views

Cygwin netcat nc doesn't resolve hosts through /etc/hosts

I'm trying to use ssh to log into remote servers, and I have a ProxyCommand setup in ~/.ssh/config to use a proxy (setup through PuTTY to connect to a VPN). The ProxyCommand uses nc to connect ...
0
votes
2answers
1k views

How do I send and receive simultaneously with netcat?

I need to test a TCP server by connecting with netcat as a client sending a stream from /dev/random and at the same time pipe the output to /dev/null. Receiving: nc 127.0.0.1 3000 > /dev/null ...
3
votes
1answer
2k views

Differences in nc (netcat) options on Ubuntu vs RedHat

nc -q -1 local host ${PORT} ${CMD} In Ubuntu, nc may be used as above, with the -q option. See manpage. -q after EOF on stdin, wait the specified number of seconds and then quit. If seconds is ...
2
votes
1answer
135 views

Network transfer speed very slow using nc (netcat) over Wi-fi LAN

Anybody could have a hint why my home Wi-fi transfer using nc is so slow? What I've got: 1) Xubuntu machine with Atheros: $ lspci | grep -i wireless 03:00.0 Network controller: Qualcomm Atheros ...
1
vote
1answer
180 views

Netcat connection over dynamic IP

I was playing around with netcat on my lan , had PC1 configured as a netcat client and PC2 configured as a netcat server into a reverse netcat TCP connection.This whole reverse TCP connection works ...
1
vote
1answer
2k views

Server: Microsoft-HTTPAPI/2.0 running on port 10234 on my Windows 7 pc?

I've recently set up a home server and spent some time working on the security. One of the tools I've been using nmap which I pointed at my Windows 7 desktop. It showed an unknown service on port ...
1
vote
1answer
219 views

Two hop SSH with multiple user names

I am trying to set up an ssh proxycommand, where the user name at the final host is different from the user name at the original host. I am logged in on firstHost as username and want to effectively ...
1
vote
1answer
817 views

Can I stop a netcat tar pipe and continue later without overriding existing files?

I'm trying to copy a lot of files from my NAS to my server, about 2TB. I found that using a netcat tar pipe to copy the directories goes pretty fast, about 40mb/s. It seems to work faster than rsync ...
1
vote
1answer
143 views

How to upload a file to Windows through a netcat session?

I have a netcat session and I want to upload a binary to the target Windows machine. How can I do so? Is there a native wget in Windows?
1
vote
1answer
980 views

Bash RTSP client with netcat - keep connection open while parsing sent data with sed?

I am trying to make a RTSP client in bash. Problem is that I must make only one connection to the server through which it will send video frames. I can keep it on one connection up to the point at ...
0
votes
1answer
104 views

How netcat can`t receive UDP packets?

I have a simple UDP device (ENC28J60 ) connected to my computer with a direct cable. The device configured to send UDP packet to 192.168.133.1 IP, 6661 port. The computer ,Fedora 22 OS, interface ...
0
votes
1answer
278 views

Installing nmap and keeping it undetectable

I have a administrative computer fully equipped with antivirus (avg,norton,malbytes. etc) that I want to install ncat(nmap) on and keep it as close to undetectable as possible. How would I do this?
0
votes
1answer
47 views

How to store data from different netcat connections in separate files?

I need a server that should receive data streams, store them in files and send further. Each connection should create a file with corresponding timestamp in file name, then write to it. My solution: ...
0
votes
1answer
114 views

Bash - Parsing XML output of nmap

I am trying to write a bash script that will take port id I retrieve from an nmap command, and then use those ports to send a file using netcat. So I got some basic knowledge using this link, How can ...
0
votes
1answer
25 views

OS X LoginHook - nc exits prematurely for no apparent reason

I'm trying to use loginhook to download large amounts of data and I've been having problems which I've nailed down to nc exiting prematurely for no apparent reason. This is a simplified test script: ...
0
votes
1answer
417 views

Netcat: Should I use Ctrl+C to close the connection?

I've opened netcat, and I'm entering things from the keyboard. When I've finished and I want to close the connection, should I just hit "Ctrl+C"? I want the connection to be closed "normally", but I ...
0
votes
1answer
347 views

netcat command is not working in bidirectional mode

I am using netcat in Linux to send and receive data (using udp protocol) from a serial port to another device through the network. The command is : nc -u 192.168.10.12 < /dev/ttyUSB0 > ...
0
votes
1answer
368 views

Keep Process Running after Quitting NetCat

I am using NetCat on Windows 7 Professional to connect to my linux machine at home. I need to run a process and make it keep running after I close NetCat (Cmd Console). However when I close and then ...
0
votes
1answer
705 views

TCP connection to my host's public IP address using Linux netcat

I need to make a TCP connection to my machine through an application that needs only the public IP address and port to connect. I have been able to do it in Windows, but I need to do it in Linux ...
0
votes
1answer
2k views

netcat and tee redirection via a bash script

Quick question that has been haunting me all day.. I have a bash script that includes this line: nc -l 8044 | tee nc-output & The output from netcat is never being written to nc-output. If I ...
4
votes
0answers
116 views

DNS tunneling through an SSH connection looses connectivity

In the article 'UDP traffic through SSH tunnel', it is described how to tunnel DNS trough a SSH tunnel: client# ssh -N -L 6667:localhost:6667 user@server server# mkfifo /tmp/fifo server# nc -k -l ...
2
votes
0answers
20 views

Using DJB's tcpclient or tcpcat bidirectionally

Can someone post an example on how to use DJB's tcpclient bidirectionally? We need to read from Tor's ControlPort as well as write to Tor's ControlPort. A "file" that is open for both, reading and ...
1
vote
0answers
86 views

nc and named pipes for port forwarding

I have my environment setup to listen to jetty on port 8888. However, for a limited time, I will have to also listen on 8889. I though of using named pipes and nc for that: mkinfo pipe1 /bin/nc -l ...
1
vote
0answers
189 views

Create duplex TCP tunnel in Windows with netcat

I need to create a TCP tunnel in Windows, I tried by chaining netcat: ncat -l 3333 | ncat 192.168.0.110 4015 This creates a single direction tunnel, though, as only the first netcat's STDOUT ...
1
vote
0answers
270 views

nc connection refused even on loopback

I'm working on an embedded linux system, which appears to be networked correctly and is running ssh (dropbear) and rpcbind. I'm setting up a server application on it, and every single thing I try ...
1
vote
0answers
3k views

how to bypass this error : “port range not valid”?

I have a port number that I want to connect to it via net-cat. previously I was working with windows and it was working perfect; but now in Ubuntu when I want to run the Net-Cat it's show me this ...
1
vote
0answers
2k views

Port forwarding on D-link DIR-615 router

I'm attempting to configure my router to forward a port to my Linux machine. The Linux computer has a static IP (192.168.0.185) Right now I'm just experimenting to make sure I can forward a port, so ...
0
votes
0answers
28 views

How can I process traffic between 2 instances of NetCat?

I have an utility that make some data transformation between stdin and stdout in both directions (encode / decode), and I want to make a some kind of bi-directional proxy using two nc instances and ...
0
votes
0answers
13 views

how to redirect incomming connections in one interface to another?

trying to do a quick test of one service that is listening on one interface, let's say 10.0.0.1:123 and i want a device that can only reach that host on another interface, let's say 192.168.1.1, to ...
0
votes
0answers
61 views

netcat between mac and linux only working in one direction

I have two machines on the same local network. One is a Mac (192.168.42.74) and one is a Dell (192.168.42.75) running Kubuntu Linux. If I issue 'nc -l 12345' on the Mac and issue 'echo "blah" | nc ...
0
votes
0answers
110 views

Creating a proxy with netcat

I'm trying to setup a permanent proxy server for one of my servers to reroute connections having issues. The proxy server is running Centos 7 x86 User -UDP or TCP-> Proxy -> Server I am am ...
0
votes
0answers
72 views

Give a command HTTP proxy auth access

I'd like to let a command (wsimport) access a URL through an HTTP proxy with authentication. It can be configured to use a proxy, but not with auth. I was wondering if a tool such as netcat, or any ...
0
votes
0answers
75 views

How to connect two debian VMs using vmware workstation so that one acts as a web server and the other as web client

I want to connect two virtual machines running using VMWare workstations - Debian Linux and I have setup private DNS server on one VM named "Server" and other VM is named "client". I am trying to ...
0
votes
0answers
119 views

SImple server to run program and return result

I am attempting to create a minimal local listen server that takes an input request, pipes the input to a program and then returns the result of the command. What I have at the moment is the program ...