4.1.1 lease duplicate

[Roar Pettersen]

Hi !


We are seeing lot's of duplicate in log files, and users also reports duplicate 
ip addresses. Here is some of our config and logs :

Internet Systems Consortium DHCP Server 4.1.1

authoritative;
ddns-update-style none;
ddns-updates off;
server-identifier dhcp1.domain.com;
option domain-name "domain.com";
option domain-name-servers 10.0.0.3, 10.0.0.1;
default-lease-time 7200;
max-lease-time 21600;
option netbios-node-type 2;
always-broadcast on;
one-lease-per-client true;
deny duplicates;
ignore declines;
ignore client-updates;

failover peer "dhcp" {
   primary;
   address 10.0.0.3;
   port 647;
   peer address 10.0.0.1;
   peer port 647;
   max-response-delay 60;
   max-unacked-updates 10;
   load balance max seconds 3;
   mclt 600;
   split 128;
}

subnet 10.8.32.0 netmask 255.255.255.0 {
         option domain-name "domain.com";
         option domain-name-servers 10.0.0.3, 10.0.0.1;
         option broadcast-address 10.8.32.255;
         option routers 10.8.32.1;
         pool {
                 failover peer "dhcp";
                 deny dynamic bootp clients;
                 range 10.8.32.12 10.8.32.249;
         }
}


May 18 22:41:37 dhcp-1 dhcpd: DHCPDISCOVER from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:38 dhcp-1 dhcpd: DHCPOFFER on 10.8.32.227 to 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:39 dhcp-1 dhcpd: DHCPDISCOVER from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:39 dhcp-1 dhcpd: DHCPOFFER on 10.8.32.227 to 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:41 dhcp-1 dhcpd: DHCPDISCOVER from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:41 dhcp-1 dhcpd: DHCPOFFER on 10.8.32.227 to 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:46 dhcp-1 dhcpd: DHCPDISCOVER from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:46 dhcp-1 dhcpd: DHCPOFFER on 10.8.32.227 to 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:47 dhcp-1 dhcpd: DHCPREQUEST for 10.8.32.227 (10.0.0.3) from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:47 dhcp-1 dhcpd: DHCPACK on 10.8.32.227 to 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:48 dhcp-1 dhcpd: DHCPREQUEST for 10.8.32.227 (10.0.0.3) from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:48 dhcp-1 dhcpd: DHCPACK on 10.8.32.227 to 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:47 dhcp-1 dhcpd: DHCPREQUEST for 10.8.32.227 (10.0.0.3) from 00:23:12:02:e1:88 via 10.8.32.1: lease owned by peer
May 18 22:41:48 dhcp-1 dhcpd: DHCPREQUEST for 10.8.32.227 (10.0.0.3) from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:48 dhcp-1 dhcpd: DHCPACK on 10.8.32.227 to 00:23:12:02:e1:88 via 10.8.32.1


authoritative;
ddns-update-style none;
ddns-updates off;
server-identifier dhcp2.domain.com;
option domain-name "domain.com";
option domain-name-servers 10.0.0.3, 10.0.0.1;
default-lease-time 7200;
max-lease-time 21600;
option netbios-node-type 2;
always-broadcast on;
one-lease-per-client true;
deny duplicates;
ignore declines;
ignore client-updates;

failover peer "dhcp" {
   secondary;
   address 10.0.0.1;
   port 647;
   peer address 10.0.0.3;
   peer port 647;
   max-response-delay 60;
   max-unacked-updates 10;
   load balance max seconds 3;
}

subnet 10.8.32.0 netmask 255.255.255.0 {
         option domain-name "domain.com";
         option domain-name-servers 10.0.0.3,10.0.0.1;
         option broadcast-address 10.8.32.255;
         option routers 10.8.32.1;
         pool {
                 failover peer "dhcp";
                 deny dynamic bootp clients;
                 range 10.8.32.12 10.8.32.249;
         }
}


May 18 22:41:37 dhcp-2 dhcpd: DHCPDISCOVER from 00:23:12:02:e1:88 via 
10.8.32.1: load balance to peer dhcp
May 18 22:41:39 dhcp-2 dhcpd: DHCPDISCOVER from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:40 dhcp-2 dhcpd: DHCPOFFER on 10.8.32.76 to 00:23:12:02:e1:88 via 
10.8.32.1
May 18 22:41:41 dhcp-2 dhcpd: DHCPDISCOVER from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:41 dhcp-2 dhcpd: DHCPOFFER on 10.8.32.76 to 00:23:12:02:e1:88 via 
10.8.32.1
May 18 22:41:46 dhcp-2 dhcpd: DHCPDISCOVER from 00:23:12:02:e1:88 via 10.8.32.1
May 18 22:41:46 dhcp-2 dhcpd: DHCPOFFER on 10.8.32.76 to 00:23:12:02:e1:88 via 
10.8.32.1
May 18 22:41:47 dhcp-2 dhcpd: uid lease 10.8.32.76 for client 00:23:12:02:e1:88 
is duplicate on 10.8.32.0/24

--
Regards;

   Roar Pettersen
   Universitetet i Bergen -  The University of Bergen