I used to use netcat for Windows to help track down network connectivity issues. However these days my anti-virus software (Symantec - but I understand others display similar behaviour) …

Ctrl+d is the correct way to close netcat in the *Nix world. Funny it should be different on Windows, considering it is a port anyway.

echo command | netcat host port This results in the command being sent to the remote host and some data being read back. But after a few seconds, the connection closes. The -w parameter …

10 In my usual gnome-terminal I do a netcat -u somewhere 1234 to start sending UDP packets to somewhere. I need to transmit the following 5 bytes, written in hexadecimal: "01 00 af 0f e1". …

I would like to test client connections with IMAP over SSL, HTTPS, and other secure text-based Internet protocols over SSL/TLS, the same way I would using telnet or netcat if they were not …

18 I'm using tcpdump to capture multicast packets and had to code up a custom program to join multicast feeds so tcpdump will "see" the packets. Just wondering if netcat or any other …

There are lots of different versions of Netcat (nc). The -lp syntax is from Hobbit's original version, I believe. Versions derived from BSD forbid the use of -p with -l. Many do not support -e. Always …

14 It's pretty easy. Under Linux there are serial devices, redirection and netcat for that. On the server you can run a netcat process listening on a given tcp port with stdin and stdout …

Use netcat. See the "CLIENT/SERVER" section of "man netcat". One machine B: nc -l 1234 | xz -c > sammy.xz and on machine A: cat sammy | nc 192.168.1.100 1234 Note that there can be …

One word: Netcat Netcat is the go-to tool for this sort of thing. You can thrash whatever port you choose with UDP packets with something like: nc -u host.example.com 53 < /dev/random (53 …