Arch Linux

M1cR0xf7

Member

Registered: 2020-05-14

Posts: 3

what is 5353/udp open|filtered zeroconf

Kernel: 5.7.4-arch1-1
Nmap version 7.80

when running nmap on localhost i get this output

# nmap -sTU 127.0.0.1
Starting Nmap 7.80 ( https://nmap.org ) at 2020-06-23 16:52 EET
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00015s latency).
Not shown: 1997 closed ports
PORT     STATE         SERVICE
5353/udp open|filtered zeroconf

Nmap done: 1 IP address (1 host up) scanned in 1.41 seconds

what is "5353/udp open|filtered zeroconf"?
i did some research and it leads me to this: https://wiki.archlinux.org/index.php/Avahi

i do not think i needed so i want to disable it. how why it is there.

and how can i disable it

Last edited by M1cR0xf7 (2020-06-23 14:59:55)

Lone_Wolf

Administrator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 15,403

Re: what is 5353/udp open|filtered zeroconf

Avahi uses that port to get information about available devices on your network .

The most common usecase I'm aware of is CUPS autodetecting of networked printers and scanners.

---

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

clean chroot building not flexible enough ?
Try clean chroot manager by graysky

M1cR0xf7

Member

Registered: 2020-05-14

Posts: 3

Re: what is 5353/udp open|filtered zeroconf

is there is a way to disable it? i do not use it

loqs

Member

Registered: 2014-03-06

Posts: 19,060

Re: what is 5353/udp open|filtered zeroconf

What is using that port?

# ss -l -p '( sport = :5353 )'

Last edited by loqs (2020-06-23 20:34:20)