Re: Why does Debian allow all incoming traffic by default

[Pascal Hambourg]

Le 22/09/2018 à 12:05, Henning Follmann a écrit :

If you send a TCP package to a computer not listening it will send a ICMP
error back.

No, standard behaviour is to send a TCP RST back.
An ICMP error may be sent back for other protocols such as UDP.