Ping-checkoff

[LOGANATHAN GOPINATH-XNT436]

Hi Glenn
 
We have used the -lf option to write the lease file to the Ram disk .  I
wanted this to on the dhcpd.conf file 
           I tried the option lease-file-name in my dhcpd.conf file to
/dev/ramdisk 
but it gets ignored while writing the lease. it is written to default
location /var/db/dhcpd.leases
is there a way we can change this before compiling .
 
Gopinath 

________________________________

From: LOGANATHAN GOPINATH-XNT436 
Sent: Thursday, February 26, 2009 7:55 PM
To: 'dhcp-users at lists.isc.org'
Subject: Re: Ping-checkoff



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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