RetroBBS - alt.os.linux.ubuntu - ufw and udp tcp ports?

ufw and udp tcp ports?

<tf10i0$1o0p$1@gioia.aioe.org>

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From: Mrde@Mrde.Mrde (Mrde)
Newsgroups: alt.os.linux.mint,alt.os.linux.ubuntu
Subject: ufw and udp tcp ports?
Date: Sun, 4 Sep 2022 03:55:12 +0200
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by: Mrde - Sun, 4 Sep 2022 01:55 UTC

VPS
Ubuntu server, MATE desktop

sudo ufw status numbered
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow 22
sudo ufw enable
sudo ufw status numbered
sudo reboot

netstat -tulpn
tcp 0 0 0.0.0.0:22

When I run from my home
sudo nmap -p 22 -sUV SERVER_IP
22/udp open|filtered ssh

But, when I run
sudo nmap -p 22,80,12345,55555 -sUV SERVER_IP
22/udp open|filtered ssh
80/udp open|filtered http
12345/udp open|filtered unknown
55555/udp open|filtered unknown

I don't have these ports open.

Why every udp port is open?

Re: ufw and udp tcp ports?

<tf276k$37uc6$1@dont-email.me>

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From: killadebug@mouse-potato.com (Killadebug)
Newsgroups: alt.os.linux.mint,alt.os.linux.ubuntu
Subject: Re: ufw and udp tcp ports?
Date: Sun, 4 Sep 2022 12:54:45 -0000 (UTC)
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by: Killadebug - Sun, 4 Sep 2022 12:54 UTC

On Sun, 04 Sep 2022 03:55:12 +0200, Mrde wrote:

> VPS Ubuntu server, MATE desktop
>
> sudo ufw status numbered sudo ufw default deny incoming sudo ufw default
> allow outgoing sudo ufw allow 22 sudo ufw enable sudo ufw status
> numbered sudo reboot
>
> netstat -tulpn tcp 0 0 0.0.0.0:22
>
> When I run from my home sudo nmap -p 22 -sUV SERVER_IP 22/udp
> open|filtered ssh
>
> But, when I run sudo nmap -p 22,80,12345,55555 -sUV SERVER_IP 22/udp
> open|filtered ssh 80/udp open|filtered http 12345/udp
> open|filtered unknown 55555/udp open|filtered unknown
>
> I don't have these ports open.
>
> Why every udp port is open?

Maybe a setup issue on your server. Here are the results on my home
machine.

VPN

PORT STATE SERVICE VERSION
22/udp closed ssh
80/udp closed http
12345/udp closed italk
55555/udp closed unknown

Service detection performed. Please report any incorrect results at
https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 0.32 seconds

local ip 192.168.1.101

PORT STATE SERVICE VERSION
22/udp closed ssh
80/udp closed http
12345/udp closed italk
55555/udp closed unknown

Service detection performed. Please report any incorrect results at
https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 0.31 seconds

--
Pull my finger

There's a whole WORLD in a mud puddle! -- Doug Clifford

computers / alt.os.linux.ubuntu / ufw and udp tcp ports?

Subject	Author
ufw and udp tcp ports?	Mrde
Re: ufw and udp tcp ports?	Killadebug