why primary and secondary allocate same IP?

[VKR V]

In my network I have primary and secondary DHCP server. Both the servers are in sync with NTP. I am observing some peculiar problem in my DHCP server i.e. when client makes request for IP address both the servers  are allocating same IP to him :-(. This is intermittent problem. The failover configuration on primary is -
failover peer "secondary" {
primary;
address 172.162.1.2;
port 519;
peer address 172.162.1.3;
peer port 519;
max-response-delay 60;
max-unacked-updates 10;
mclt 500;
split 128;
load balance max seconds 3;
}


I avoid seondary configuration, which is simple, for brevity. Below are logs and lease info.


DHCP Primary
---------------------
Aug  7 12:56:21 BRAS-DHCP-PRI/BRAS-DHCP-PRI dhcpd: [ID 702911 local7.info] DHCPDISCOVER from 00:10:d0:4a:a9:b7 (nice-1) via 125.162.1.29
Aug  7 12:56:21 BRAS-DHCP-PRI/BRAS-DHCP-PRI dhcpd: [ID 702911 local7.info]DHCPOFFER on 220.226.167.134 to 00:10:d0:4a:a9:b7  (p2j5l1) via
125.162.1.29


DHCP  Secondary
---------------------------
Aug  7 12:56:21 BRAS-DHCP-SEC/BRAS-DHCP-SEC dhcpd: [ID 702911 
local7.info]
DHCPDISCOVER from 00:10:d0:4a:a9:b7 (nice-1) via 125.162.1.29
Aug  7 12:56:21 BRAS-DHCP-SEC/BRAS-DHCP-SEC dhcpd: [ID 702911 
local7.info]
DHCPOFFER on 220.226.167.202 to 00:10:d0:4a:a9:b7  (nice-1) via
125.162.1.29


The lease file on both the servers are -

DHCP PRIMARY
-------------------------
lease 125.162.1.32 {
  starts 1 2006/08/07 09:00:38;
  ends 1 2006/08/07 09:02:38;
  tstp 0 2006/08/06 12:13:06;
  tsfp 0 2006/08/06 13:13:06;
  atsfp 0 2006/08/06 13:13:06;
  cltt 1 2006/08/07 09:00:38;
  binding state free;
  hardware ethernet 00:10:d0:4a:a9:b7;
  uid "\001\000\260\320M\251\267";
  client-hostname "nice-1";
}


DHCP SECONDRY
-----------------------------
lease 125.162.1.32 {
  starts 1 2006/08/07 07:26:21;
  ends 1 2006/08/07 07:28:21;
  tstp 0 2006/08/06 04:37:14;
  tsfp 0 2006/08/06 16:24:43;
  atsfp 0 2006/08/06 16:24:43;
  cltt 1 2006/08/07 07:26:21;
  binding state backup;
  hardware ethernet 00:10:d0:4a:a9:b7;
  uid "\001\000\260\320M\251\267";
  client-hostname "nice-1";
}


Has anyone discover this? Why both the servers are allocating the same IP, when hash result by both the servers is different?


Regards
VK

 				
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