DHCP Queue

T MANIKANDAN-PKXR74 manikandan.t at motorola.com
Wed Feb 4 17:01:13 UTC 2009

Hello can any one help to my query mentioned below.


From: dhcp-users-bounces at lists.isc.org
[mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of T
Sent: Tuesday, February 03, 2009 7:30 PM
To: dhcp-users at lists.isc.org
Subject: DHCP Queue

   We have a Network element AAA where it sends 250 clients per second
to aquire a Lease from ISC DHCP server. and I have seen that a 4 way
quad core AMD opteron processor/ SAS I/O drive with RHEL 5 and ISC DHCP
3.0.5 can handle upto 125 lease per second ( Result achieved from
Nominum DHCPperf tool).
   With total 135000 clients in my network it takes around 18 min to
complete the lease ( Time taken= (135000/125)/60 = 18 Minutes), When my
AAA network element which is used for authentication and other purpose
finishes the job in approx 8 Minutes, while my DHCP server take 18
Minutes to complete the Job.
   Say at the end of 3 seconds, DHCP server gets a hit of 750
(250+250+250) Discover request while only 375 (125+125+125) is being
allocated an ip address and balance 375 will be in a queue
  at the end of 500 seconds, my DHCP server would have got aprox 135000
discover request and it has processed only approx 65000 request and
balance 75000 will be pending in the queue.
My queries
How long the client request will remain in queue 
what will be the maximum attempt the client will make to obtain the
What will be the state of clients which are there in queue.
Is there any other Best solution in which my DHCP server can handle all
250 clients at a second 
Can i have 2 DHCP server in active active state handling different
scopes so that all 250 request are handled and there is no queue if so
how the lease file will be maintained.
  Please help me understanding how the DHCP server handles this
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