Bash for sending and receiving raw IP packets

Fri, 03 Apr 2020 07:35:12 +0000

I stumbled across this feature during my bachelor studies:

echo "Hello World" > /dev/tcp/127.0.0.1/5000
echo "Hello World" > /dev/udp/127.0.0.1/5000

You need to be root (obviously) and its supported in bash environment - but not on all systems. You can also cat on the ports and use dns adresses. Its neat to just get a byte out :). And if you need something more sophisicated, be sure to use the good old netcat (nc).

Bash on Nico Maas

Bash for sending and receiving raw IP packets