[Kea-users] DHCPSRV_NO_SOCKETS_OPEN problem

[Dan Oachs]

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 <
kea-users at lists.isc.org> 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: stephen.berg at nrlssc.navy.mil  <- (Preferred contact)
> Flank Speed: stephen.p.berg.civ at us.navy.mil
>
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