Re: [Kea-users] DHCPSRV_NO_SOCKETS_OPEN problem

Stephen Berg, Code 7309 via Kea-users Fri, 18 Feb 2022 07:29:53 -0800

I just figured out that although dnsmasq is disabled according to systemd something is starting it at boot time. I think libvirtd or gnome-boxes. Removed those and kea now starts up as expected.


On 2/18/2022 8:58 AM, Dan Oachs wrote:

I am running kea 2.0.1 on Rocky Linux 8.5.


My interfaces option is set to:
      "interfaces": ["eth0"]

And I have ip helper addresses set for all the vlans to point dhcp traffic to this server.

Are you 100% sure there is not some other process or dhcp server listening on port 67 on your server?

I also have a second kea 2.0.1 server ( setup in HA mode with this server). The second server has an interface on each vlan so it can get the dhcp requests directly and not need them forwarded from the router.


On this server the interfaces option looks like this:
       "interfaces": ["*"]


--Dan

On Fri, Feb 18, 2022 at 8:33 AM Stephen Berg, Code 7309 via Kea-users <[email protected]> wrote:


    I'm evaluating kea 1.8 to eventually integrate into my network. I've
    got 6 subnets that I'll be managing eventually.  Relay agents will
    be on
    all but one subnet. An initial install and test setup with mysql
    backend
    went okay but I have one show stopper problem now.

    Whenever I start the service I see in the log:
    DHCPSRV_OPEN_SOCKET_FAIL failed to open socket: failed to open
    socket on
    interface eth0, reason: failed to bind fallback socket to address
    <serverIP>, port 67, reason: Address already in use - is another DHCP
    server running?
    2022-02-18 08:23:27.547 WARN [kea-dhcp4.dhcpsrv/3416.140158564502848]
    DHCPSRV_NO_SOCKETS_OPEN no interface configured to listen to DHCP
    traffic

    I changed dhcp-socket-type to udp to see if that would change the
    behavior and got this:
    2022-02-18 08:14:13.653 WARN [kea-dhcp4.dhcpsrv/3218.139637232491840]
    DHCPSRV_OPEN_SOCKET_FAIL failed to open socket: failed to open
    socket on
    interface eth0, reason: Failed to bind socket 15 to <serverIP>/port=67
    2022-02-18 08:14:13.653 WARN [kea-dhcp4.dhcpsrv/3218.139637232491840]
    DHCPSRV_NO_SOCKETS_OPEN no interface configured to listen to DHCP
    traffic

    This is running on a virtual machine, rocky linux 8.5. Selinux and
    firewall have been disabled for testing.  Network seems fine on the
    system other than this.  My initial config is just a couple of
    reserved
    address based on mac address and no pool.  If I can get this
    working I
    plan to add reservations for all clients in each of the subnets.

-- Stephen Berg, IT Specialist, Ocean Sciences Division, Code 7309

    Naval Research Laboratory
    W:   (228) 688-5738
    DSN: (312) 823-5738
    C:   (228) 365-0162
    Email: [email protected] <- (Preferred contact)
    Flank Speed: [email protected]

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--
Stephen Berg, IT Specialist, Ocean Sciences Division, Code 7309
Naval Research Laboratory
W:   (228) 688-5738
DSN: (312) 823-5738
C:   (228) 365-0162
Email:[email protected]   <- (Preferred contact)
Flank Speed:[email protected]

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Re: [Kea-users] DHCPSRV_NO_SOCKETS_OPEN problem

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