send echo to socket network

echo "foo" > /dev/tcp/192.168.1.2/25

this command will send a message to the socket 25 on host 192.168.1.2 in tcp. works on udp and icmp understand only IP address, not hostname. on the other side (192.168.1.2), you can listen to this socket and test if you receive the message. easy to diagnose a firewall problem or not.

By: mobidyc

2009-09-12 16:48:05

echo Network udp tcp icmp protocol socket

2 Alternatives + Submit Alt

send echo to socket network

Using netcat, usuallly installed on debian/ubuntu. Also to test against a sample server the following two commands may help echo got milk? | netcat -l -p 25 python -c "import SocketServer; SocketServer.BaseRequestHandler.handle = lambda self: self.request.send('got milk?\n'); SocketServer.TCPServer(('0.0.0.0', 25), SocketServer.BaseRequestHandler).serve_forever()" Show Sample Output
This is sample output - yours may be different.
```
got milk?
```
2

echo foo | netcat 192.168.1.2 25

pykler · 2009-09-13 01:33:02 4
send echo to socket network

you can use a pair of commands to test firewalls. 1st launch this command at destination machine ncat -l [-u] [port] | cat then use this command at source machine to test remote port echo foo | ncat [-u] [ip address] [port] First command will listen at specified port. It will listen TCP. If you use -u option will listen UDP. Second command will send "foo" through ncat and will reach defined IP and port. Show Sample Output
This is sample output - yours may be different.
```
"foo" if it's working
"Ncat: Connection refused." if it's not
```
-1

echo foo | ncat [ip address] [port]

dragonauta · 2012-10-26 10:53:47 7

What Others Think

This syntax is a shell feature, not of the OS, and I know it is part of bash, if not in more in shells. But annoyingly in the default debian packaging for bash, /dev/tcp files are disabled, since you can get the same functionality and more with netcat (or socat). The manpage says these net redirections can produce "completely unexpected results."

bwoodacre · 786 weeks and 3 days ago

It would be nice if commercial Unixes shipped with netcat, or the black gang in operations could compile freely. FWIW, Solaris 10 ships with this feature enabled, and I believe it defaults to ON for at least some BSDs. The fuller syntax is /dev/[tcp|udp]/[host]/[port]

lbonanomi · 786 weeks and 3 days ago

Just a correction to your description. This does not work for ICMP packets (ping, etc.) Although it would be kinda cool if it did.

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