uid lease duplicate problem

Fri Jun 6 21:03:28 UTC 2014

Try to post again. We've seen lots of those uid lease duplicate messages 
in our logs every day: both failover servers offer, but with different IP 
to same DHCP client, like this:

Jun  6 16:25:12 dhcp-1 dhcpd: DHCPDISCOVER from 00:1d:09:19:d2:2d via 10.10.45.252
Jun  6 16:25:12 dhcp-2 dhcpd: DHCPDISCOVER from 00:1d:09:19:d2:2d via 10.10.45.252
Jun  6 16:25:13 dhcp-1 dhcpd: DHCPOFFER on 10.10.45.242 ends 2014/06/06:20:27:12 to 00:1d:09:19:d2:2d (bl-hper-9qww3f1) via 10.10.45.252
Jun  6 16:25:13 dhcp-2 dhcpd: DHCPOFFER on 10.10.45.132 ends 2014/06/06:20:27:12 to 00:1d:09:19:d2:2d (bl-hper-9qww3f1) via 10.10.45.252
Jun  6 16:25:13 dhcp-2 dhcpd: uid lease 10.10.45.132 for client 00:1d:09:19:d2:2d is duplicate on hper

For most problems I have ran into with ISC DHCP, I could always find 
solution here on the list. I would assume this uid duplicate is common 
problem and we are not the only one see it, or you think it can be 
ignored?

Thanks!!

Sue

On Thu, 5 Jun 2014, Sue True wrote:

>
> We are running 4.2.5-P1, started to get IP conflict report since migrated the 
> servers to failover config couple of months ago.
>
> We can't tell if the failover config could be one of the reasons that might 
> caused the conflict, I noticed there are lots of uid lease duplicate logs.
>
> I've tried both the configuration option " --enable-secs-byteorder" and patch 
> provided by Wim Vandersmissen 
> https://lists.isc.org/pipermail/dhcp-users/2010-April/011669.html
>
> But none of those helps, both servers OFFER with different IPs, which also 
> caused client IP constantly change, pool churn.
>
> Has anyone run into the same problem or know how to stop the uid duplicate?
>
> Here are some info about failover
>
>    - we're using 'split 128' for the load-balancing
>    - we're not using any reservations or static lease
>    - we're using 'one-lease-per-client'
>    - both partners are in normal state (00:00:00:02)
>    - MCLT = 1800
>
> Here are some logs:
>
> Jun  5 05:56:02 dhcp-2 dhcpd: DHCPRELEASE of 10.10.2.143 from 
> fc:0f:e6:c4:e8:d1 via eth0 (found)
> Jun  5 08:30:44 dhcp-1 dhcpd: DHCPDISCOVER from fc:0f:e6:c4:e8:d1 via 
> 10.10.2.252: load balance to peer dhcp
> Jun  5 08:30:44 dhcp-1 dhcpd: DHCPDISCOVER from fc:0f:e6:c4:e8:d1 via 
> 10.10.2.253: load balance to peer dhcp
> Jun  5 08:30:44 dhcp-2 dhcpd: DHCPDISCOVER from fc:0f:e6:c4:e8:d1 via 
> 10.10.2.252
> Jun  5 08:30:45 dhcp-2 dhcpd: DHCPOFFER on 10.10.2.143 ends 
> 2014/06/05:12:32:44 to fc:0f:e6:c4:e8:d1 via 10.10.2.252
> Jun  5 08:30:45 dhcp-1 dhcpd: uid lease 10.10.2.161 for client 
> fc:0f:e6:c4:e8:d1 is duplicate on halls-banta-hepburn
> Jun  5 08:30:45 dhcp-1 dhcpd: DHCPREQUEST for 10.10.2.143 (10.234.220.191) 
> from fc:0f:e6:c4:e8:d1 via 10.10.2.253: lease owned by peer
> Jun  5 08:30:45 dhcp-1 dhcpd: uid lease 10.10.2.161 for client 
> fc:0f:e6:c4:e8:d1 is duplicate on halls-banta-hepburn
> Jun  5 08:30:45 dhcp-1 dhcpd: DHCPREQUEST for 10.10.2.143 (10.234.220.191) 
> from fc:0f:e6:c4:e8:d1 via 10.10.2.252: lease owned by peer
> Jun  5 08:30:45 dhcp-2 dhcpd: DHCPREQUEST for 10.10.2.143 (10.234.220.191) 
> from fc:0f:e6:c4:e8:d1 via 10.10.2.253
> Jun  5 08:30:45 dhcp-2 dhcpd: DHCPACK on 10.10.2.143 ends 2014/06/05:13:00:45 
> to fc:0f:e6:c4:e8:d1 via 10.10.2.253
> Jun  5 08:30:45 dhcp-2 dhcpd: DHCPREQUEST for 10.10.2.143 (10.234.220.191) 
> from fc:0f:e6:c4:e8:d1 via 10.10.2.252
> Jun  5 08:30:45 dhcp-2 dhcpd: DHCPACK on 10.10.2.143 ends 2014/06/05:13:00:45 
> to fc:0f:e6:c4:e8:d1 via 10.10.2.252
> Jun  5 08:45:46 dhcp-2 dhcpd: DHCPREQUEST for 10.10.2.143 from 
> fc:0f:e6:c4:e8:d1 via eth0
> Jun  5 08:45:46 dhcp-2 dhcpd: DHCPACK on 10.10.2.143 ends 2014/06/05:20:45:46 
> to fc:0f:e6:c4:e8:d1 via eth0
> Jun  5 08:58:03 dhcp-2 dhcpd: DHCPRELEASE of 10.10.2.143 from 
> fc:0f:e6:c4:e8:d1 via eth0 (found)
> Jun  5 11:08:15 dhcp-1 dhcpd: DHCPDISCOVER from fc:0f:e6:c4:e8:d1 via 
> 10.10.2.253: load balance to peer dhcp
> Jun  5 11:08:15 dhcp-1 dhcpd: DHCPDISCOVER from fc:0f:e6:c4:e8:d1 via 
> 10.10.2.252: load balance to peer dhcp
> Jun  5 11:08:15 dhcp-2 dhcpd: DHCPDISCOVER from fc:0f:e6:c4:e8:d1 via 
> 10.10.2.253
> Jun  5 11:08:16 dhcp-2 dhcpd: DHCPOFFER on 10.10.2.137 ends 
> 2014/06/05:15:10:15 to fc:0f:e6:c4:e8:d1 via 10.10.2.253
> Jun  5 11:08:16 dhcp-1 dhcpd: uid lease 10.10.2.143 for client 
> fc:0f:e6:c4:e8:d1 is duplicate on halls-banta-hepburn
> Jun  5 11:08:16 dhcp-1 dhcpd: DHCPREQUEST for 10.10.2.137 (10.234.220.191) 
> from fc:0f:e6:c4:e8:d1 via 10.10.2.252: lease owned by peer
> Jun  5 11:08:16 dhcp-1 dhcpd: uid lease 10.10.2.143 for client 
> fc:0f:e6:c4:e8:d1 is duplicate on halls-banta-hepburn
> Jun  5 11:08:16 dhcp-1 dhcpd: DHCPREQUEST for 10.10.2.137 (10.234.220.191) 
> from fc:0f:e6:c4:e8:d1 via 10.10.2.253: lease owned by peer
> Jun  5 11:08:16 dhcp-2 dhcpd: DHCPREQUEST for 10.10.2.137 (10.234.220.191) 
> from fc:0f:e6:c4:e8:d1 via 10.10.2.253
> Jun  5 11:08:16 dhcp-2 dhcpd: DHCPACK on 10.10.2.137 ends 2014/06/05:15:38:16 
> to fc:0f:e6:c4:e8:d1 via 10.10.2.253
> Jun  5 11:08:16 dhcp-2 dhcpd: DHCPREQUEST for 10.10.2.137 (10.234.220.191) 
> from fc:0f:e6:c4:e8:d1 via 10.10.2.252
> Jun  5 11:08:16 dhcp-2 dhcpd: DHCPACK on 10.10.2.137 ends 2014/06/05:15:38:16 
> to fc:0f:e6:c4:e8:d1 via 10.10.2.252
>
>
>
> Thanks!
>
> Sue
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