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Thread: Listening connections on my server

  1. #1
    Join Date
    Dec 2010
    Beans
    374

    Listening connections on my server

    I did a netstat -tulpn, and got the following:
    Code:
    Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
    udp        0      0 <my-public-ip>:68        0.0.0.0:*                           722/systemd-network 
    udp        0      0 0.0.0.0:51820           0.0.0.0:*                           -
    Does port 68 really need to be listening on the outside interface? And any ideas on the second line, what it is/doing?

    EDIT: I am running Ubuntu Server 20
    Last edited by sniper8752; November 18th, 2020 at 11:36 PM.

  2. #2
    Join Date
    Nov 2007
    Location
    London, England
    Beans
    7,163
    Distro
    Xubuntu 20.04 Focal Fossa

    Re: Listening connections on my server

    Port 68 is bootpc - it is normal, and listens for DHCP responses.
    Port 51820 appears to be the kernel listening rather than a process. The only time I have seen this is when wireguard is configured and listening. Do you have wireduard configured? If it's not that then I have no idea.

  3. #3
    Join Date
    Dec 2010
    Beans
    374

    Re: Listening connections on my server

    Yup! Thank you.

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