Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol.

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19
votes
9answers
14k views

How to set up disk cloning with dd, netcat and ssh tunnel?

I would like to copy stuff in bulk (reimage disk using dd) with netcat from host A to B via ssh encrypted channel on Linux. What commands should I type on both ends?
9
votes
4answers
14k views

Connecting to HTTPS with netcat (nc) [closed]

I'm working on homework assignment for my college. Task is to fetch web page on HTTPS using nc (netcat). To fetch a page over HTTP, I do this: cat request.txt | nc -w 5 <someserver> 80 In ...
0
votes
2answers
1k views

SSH and port forward socks proxy

I would like to setup an ssh tunnel that includes 3 machines. One machine I want to make http requests from but can only connect to a central server and outbound port 80 requests. The server is a ...
11
votes
3answers
6k views

What's the difference between socat and netcat?

I understand that socat is described as a "more advanced" version of netcat, but what is the actual difference? Would it be correct to say that everything you can do in netcat you can also do in ...
9
votes
8answers
33k views

Send an email with an attached file using telnet or netcat

I often use telnet or netcat to connect smtp servers to send an email as a test. Does anyone know how you would send an email using telnet or netcat but attach a file as well? There are probably ...
3
votes
1answer
2k views

What is the purpose of netcat's “-w timeout” option when ssh tunneling?

I am in the exact same situation as the person who posted another question, I am trying to tunnel ssh connections through a gateway server instead of having to ssh into the gateway and manually ssh ...
3
votes
5answers
739 views

Network performance in large transfer of data

I'm using DD over Netcat to copy a hard disk from one system to another, straight clone. I booted RIP on each system. target system: nc -l -p 9000 |pv|dd of=/dev/hda source system: dd if=/dev/hda ...
2
votes
2answers
388 views

How do I log tls-encrypted smtp traffic?

I'd like to know what my local postfix says to the Amazon SES smtpd after the STARTTLS. In plain text, so I can understand it. Amazon SES requires TLS, so I can't temporarily turn it off. I currently ...
3
votes
1answer
849 views

Apache piping log to netcat fails

I want to send my Apache log in a custom format (GELF) to a UDP receiving server (running Graylog2). I was sure everything was working fine but then after a little while, I got an alert, my server was ...
3
votes
6answers
1k views

TCP Sessions and IP Changes

What happens to a TCP session when the IP of a client changes? I did a simple test of having netcat listen on a port, and connecting to that port from a client machine. I then changed the IP of ...
1
vote
1answer
684 views

netcat not found in Amazon AMI (Centos)

I followed this guide to migrate my amazon image from one zone to another. Everything goes fine, but when i run this command: netcat -p 9999 -l >/dev/sdf It shows that the command is not found. ...
0
votes
2answers
3k views

Measuring network throughput with netcat vs. CIFS/SMB transfer rates

I have been attempting to measure and benchmark our LAN's throughput as part of a larger project. Our LAN is constructed using cat5e and HP ProCurve 1800-24G switches which support 10/100/1000 Mbps ...