Funny #nix happenings.
Install netcat and listen on a port:
`nc -l 0.0.0.0 5555`
Try to connect: `nc localhost 5555` gives Connection Refused.
What is happening?
The answer hides in netstat logs:
```
# netstat -ptwuln
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:36621 0.0.0.0:* LISTEN 20/nc
```
See that? "0.0.0.0:36621"
Why, #nix, oh why did you take away 3 hours of my life by breaking a basic network debugging tool?
Oh, and the funniest? You can't connect on that port either. You'll get a connection reset.
@ruff Containers are typically stuck at IPv4.
@dcz I mean you can map it to whatever you want but default is
[ruff@dei ~]$ ping localhost
PING localhost(localhost (::1)) 56 Datenbytes
64 Bytes von localhost (::1): icmp_seq=1 ttl=64 Zeit=0.024 ms