ETOOBUSY 🚀 minimal blogging for the impatient
A little reminder on how to put netcat in listen mode.
It occurred to me that I needed to setup a little listener on a machine to see if traffic was going through correctly. What better tool than netcat to do this?!?
It turns out that I didn’t remember almost at all how to use it. I first tried this:
netcat -l 10.0.0.1 54321
Nice try, Flavio! But to listen to port
54321 you need to use option
netcat -l -p 54321 10.0.0.1
… is closer but still not correct, because to set the listening address
you need to use option
-s, which leads us to…
netcat -l -p 54321 -s 10.0.0.1
… which, in the end, is correct.
Then, of course, take a deep look at your
iptables -vnL, because traffic
might get trapped there!