I have scanned my network with nmap.
Host is up (0.000047s latency).
Not shown: 1995 closed ports
PORT STATE SERVICE
25/tcp open smtp
68/udp open|filtered dhcpc
631/udp open|filtered ipp
5353/udp open|filtered zeroconf
5355/udp open|filtered llmnr
with sudo /etc/init.d/zeroconf disable I get nothing.
with the gufw I created the rules to close ports 5353 and 5355 but they are still open.
What can I do?
I would recommend using the following firewall.
UFW (Uncomplicated Firewall)
It is the one that I use and it has worked correctly, and easy to use.
Installation:
root@linux:~# apt-get install ufw
Activate event logging
root@linux:~# ufw logging on
Enable access via SSH
root@linux:~# ufw allow ssh/tcp
Activate the Firewall
root@linux:~# ufw enable
Check the status of the Firewall
root@linux:~# ufw status verbose
Block ports 5353 and 5355
root@linux:~# ufw deny 5353
root@linux:~# ufw deny 5355
I leave a link so you can verify a little more about its use. Tutorial UFW