[Kea-users] ALLOC_ENGINE_V4_DISCOVER_ADDRESS_CONFLICT - conflicting reservation for address

[Marcin Siodelski]

It looks like the client has declined the lease and thus it can't be
allocated to him. Depending on the logging level, you may find the
DECLINE packet in your log and see who and when sent it. Declined
addresses remain in that state for a configurable amount of time. Nobody
can be assigned those addresses as long as they remain in that state.

Marcin Siodelski
ISC

On 03.11.2017 14:44, Mikael Bjerkeland wrote:
> Hi,
> 
> I'm a new Kea user. Just recently upgraded to 1.3.0 and went into
> production with DHCPv4 and DHCPv6 reservations and leases stored in
> PostgreSQL.
> 
> Upon a reboot or change on a workstation we noticed the user was not
> able to get its IP address anymore:
> 
> 2017-11-03 13:15:26.269 WARN  [kea-dhcp4.alloc-engine/31631]
> ALLOC_ENGINE_V4_DISCOVER_ADDRESS_CONFLICT [hwtype=1 f4:6d:04:0f:3f:b6],
> cid=[01:f4:6d:04:0f:3f:b6], tid=0xe1f27234: conflicting reservation for
> address 200.1.246.60 with existing lease Address:       200.1.246.60
> Valid life:    86400
> T1:            0
> T2:            0
> Cltt:          1509711225
> Hardware addr:
> Client id:     (none)
> Subnet ID:     11
> State:         declined
> 
> 2017-11-03 13:15:26.272 WARN  [kea-dhcp4.alloc-engine/31631]
> ALLOC_ENGINE_V4_ALLOC_FAIL [hwtype=1 f4:6d:04:0f:3f:b6],
> cid=[01:f4:6d:04:0f:3f:b6], tid=0xe1f27234: failed to allocate an IPv4
> address after 6 attempt(s)
> 
> To resolve this I had to clear the lease from the lease4 table in the
> database. Can anyone shed some light on this? The user should have
> received its previously assigned address. Is there a config flag to
> allow this? I am using out-of-pool reservations.
> 
> Before deletion lease4 had the following column for this specific lease:
> 
>   address   |     hwaddr     |    client_id     | valid_lifetime |     
>    expire         | subnet_id | fqdn_fwd | fqdn_rev |     hostname     |
> state |    ?column?
>  3355571772 | \x             | \x               |          86400 |
> 2017-11-04 13:13:45+01 |        11 | f        | f        |             
>     |     1 | 2001.1.246.60
> 
> 
> Regards,
> Mikael
> 
> -- 
> Hug a tree before you print this e-mail
> 
> 
> _______________________________________________
> Kea-users mailing list
> Kea-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/kea-users
>