1. Forum
  2. Usenet
  3. ALT.OS.LINUX.UBUNTU

  • ufw and udp tcp ports?

    From Mrde@21:1/5 to All on Sun Sep 4 03:55:12 2022
    XPost: alt.os.linux.mint

    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?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Killadebug@21:1/5 to Mrde on Sun Sep 4 12:54:45 2022
    XPost: alt.os.linux.mint

    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)