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Today's Topics:
1. Re: balanced pool logs (glenn.satch...@uniq.com.au)
2. Dhcp load testing (Kraishak Mahtha)
3. Re: Dhcp load testing (Peter Yardley)
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Message: 1
Date: Thu, 31 Oct 2019 04:02:29 +1100
From: glenn.satch...@uniq.com.au
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: balanced pool logs
Message-ID: <bc3aeef0772ca8e05acdecc93c704...@uniq.com.au>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Hi Kraishak
What settings do you have in the failover peer statement on the two
servers? Can you paste the whole statement into the email please?
There is a discussion of the relevant settings in the dhcpd.conf man
page, look for the section "The Failover pool balance statements".
Perhaps if you have non-default settings for those values mentioned it
may skew the algorithm. Usually the defaults are a pretty good option,
and only change them if there is a specific problem.
regards,
-glenn
On 2019-10-30 01:45, Kraishak Mahtha wrote:
> Do we have any internal schedule thread to do balancing pools? or any
> option that controls the behaviour of this balancing pools process
> Just want to know what will be triggering the dhcpd to perform the
> pool balance that frequently
>
> On Mon, Oct 28, 2019 at 12:24 PM Kraishak Mahtha
> <kraishak....@gmail.com> wrote:
>
>> Hi
>> I am running the isc dhcpd in primary-failover mode with 50:50
>> percent on my two different lab environments with a test tool, I am
>> seeing the balancing pool messages so frequently in the lab-1
>> environments
>> EX:
>> Oct 25 08:40:11 server1 dhcpd[446460]: balanced pool 1c9be20
>> 192.168.0.0/24 [1] total 229 free 63 backup 64 lts 0 max-misbal
>> 19
>> Oct 25 08:40:11 server1 dhcpd[446460]: balancing pool 1c88680
>> 192.168.3.0/24 [2] total 213 free 42 backup 42 lts 0 max-own
>> (+/-)8
>> Oct 25 08:40:11 server1 dhcpd[446460]: balanced pool 1c88680
>> 192.168.6.0/24 [3] total 213 free 42 backup 42 lts 0 max-misbal
>> 13
>> Oct 25 08:40:11 server1 dhcpd[446460]: balancing pool 1c740b0
>> 192.168.101.0/24 [4] total 225 free 110 backup 109 lts 0
>> max-own (+/-)22
>>
>> - - - - - - - - - - - - and so on
>> These logs are printing for one to two seconds duration totally, at
>> this time I am not seeing any dhcp traffic logs like discover,
>> offer, renew (yes it is less duration of two seconds no need to
>> worry but just want to make sure, is the dhcp server wont serve the
>> lease for the clients while it balancing the pools ?)
>> In the second lab (lab-2) I see these messages but not that
>> frequent of which i see on lab-1,
>> Does one have any idea that, In general do we have any fixed time
>> interval at which the dhcpd server balance the pools ?just want to
>> know why i am getting the these logs so frequently in lab-1
>>
>> Thanks in advance
>
>
> Links:
> ------
> [1] http://192.168.0.0/24
> [2] http://192.168.3.0/24
> [3] http://192.168.6.0/24
> [4] http://192.168.101.0/24
> _______________________________________________
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
Message: 2
Date: Wed, 30 Oct 2019 23:51:19 +0530
From: Kraishak Mahtha <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Dhcp load testing
Message-ID:
<caddat85g1aeqgj_hxpcfg-evm+xe2b+xeeqj_za7hmhdovh...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi Everyone,
I am using the isc dhcpd on my lab environment so before I use it to my
workshop, I want to try load test on it. I created the configuration with
sufficient long pool, I tried running perfdhcp tool for load testing as
suggested in many google forums and I observed that at a maximum of 10-14
transactions per second(tried with other different tools also), If I
increase load the packets are getting dropped, I don't think that is
benchmark of ISC dhcp, can any one has idea or any suggestions of how can i
increase load handling capacity of the dhcpd service
FYI: I diabled ping check
Ping check false;
Ping time out 0;
The above two statements already added to my config file.
Thanks
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Message: 3
Date: Thu, 31 Oct 2019 01:02:44 +0000
From: Peter Yardley <peter.yard...@uts.edu.au>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Dhcp load testing
Message-ID: <acd04865-359e-444b-be7f-a79a2cb03...@uts.edu.au>
Content-Type: text/plain; charset="utf-8"
Take a look at ?
https://kb.isc.org/docs/aa-01283
Major bottleneck is disk IO so try to speed that up (raid, flash etc). If using
UNIX put the leases file in a mount point with ?noatime? enabled. Send the logs
to another server using syslog.
> On 31 Oct 2019, at 5:21 am, Kraishak Mahtha <kraishak....@gmail.com> wrote:
>
> Hi Everyone,
>
> I am using the isc dhcpd on my lab environment so before I use it to my
> workshop, I want to try load test on it. I created the configuration with
> sufficient long pool, I tried running perfdhcp tool for load testing as
> suggested in many google forums and I observed that at a maximum of 10-14
> transactions per second(tried with other different tools also), If I increase
> load the packets are getting dropped, I don't think that is benchmark of ISC
> dhcp, can any one has idea or any suggestions of how can i increase load
> handling capacity of the dhcpd service
> FYI: I diabled ping check
> Ping check false;
> Ping time out 0;
> The above two statements already added to my config file.
>
>
> Thanks
> _______________________________________________
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
._--_|\ Peter Yardley |
/ \ Senior Network Engineer | peter.yard...@uts.edu.au
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. v University of Technology, Sydney.| Fax: +61 2 9514-4327
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