Ping-checkoff
LOGANATHAN GOPINATH-XNT436
gopinathloganathan at motorola.com
Thu Feb 26 14:25:22 UTC 2009
Hi all
Thanks for your reply ,
I tried a couple of tests , Firstly adding ping-check false into my
dhcpd.conf and mounted the dhcp on /dev/ramdisk .I measured the
performance of the server using dhcperf. To my surprise the number of
leases i.e High water mark went to a whopping number of 8090 and i was
able to get around 2300 five handshakes successfully. The subnet which i
used was 10.1.1.0-10.1.1.254 so dhcp wrote a lease of 251 numbers
When i increased the host numbers to 10.1.0.0-10.1.255.254
roughy 65000 hosts the numbers came down drastically to 92 transactions
per second from 8090. dhcpd wrote a lease file of ~3500 leases. I wonder
what could cause such a huge drop in numbers . Has anyone tried this or
faced a similar problem.
Cheers
Gopinath
Date: Wed, 25 Feb 2009 23:41:24 +1100 (EST)
From: Glenn Satchell <Glenn.Satchell at uniq.com.au>
Subject: Re: Ping-checkoff
To: dhcp-users at lists.isc.org
Message-ID: <200902251241.n1PCfOvc013767 at mail.uniq.com.au>
Content-Type: TEXT/plain; charset=us-ascii
>Date: Wed, 25 Feb 2009 11:39:43 +0100
>From: Christof Chen <christof at chen.de>
>To: Users of ISC DHCP <dhcp-users at lists.isc.org>
>Subject: Re: Ping-checkoff
>X-Enigmail-Version: 0.95.7
>X-Df-Sender: 285754
>X-BeenThere: dhcp-users at lists.isc.org
>
>> Hi can some one help me disabling ping-check off and moving the dhcp
>> leases write ram disk .Your help would be highly appreciated
>
>What about writing
>
> ping-check false;
>
>into your dhcpd.conf file?
>
>The location of the lease file can be changed either on compile time or
>(probably more convenient) as option -lf to the dhcpd command.
>
or even more convenient use dhcpd.conf entry
The lease-file-name statement
lease-file-name name;
Name should be the name of the DHCP server's lease file.
By default, this is /var/dhcp/dhcpd.leases. This state-
ment must appear in the outer scope of the configuration
file - if it appears in some other scope, it will have no
effect.
lease-file "/path/to/ramdisk/dhcpd.leases";
regards,
-glenn
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