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Today's Topics:
1. Re: Maximum Time difference between DHCP primary and DHCP
failover Server (Ed Daniel)
2. Re: Maximum Time difference between DHCP primary and DHCP
failover Server (Simon Hobson)
3. Re: Maximum Time difference between DHCP primary and DHCP
failover Server (Thomas Markwalder)
4. Re: Maximum Time difference between DHCP primary and DHCP
failover Server (glenn.satch...@uniq.com.au)
5. Re: Maximum Time difference between DHCP primary and DHCP
failover Server (kraishak)
6. Re: Maximum Time difference between DHCP primary and DHCP
failover Server (kraishak)
----------------------------------------------------------------------
Message: 1
Date: Mon, 18 Jan 2021 17:56:50 +0000
From: Ed Daniel <esdan...@esdaniel.com>
To: dhcp-users@lists.isc.org
Subject: Re: Maximum Time difference between DHCP primary and DHCP
failover Server
Message-ID: <29441cdb-24d9-a03e-a6aa-78ff8dde3...@esdaniel.com>
Content-Type: text/plain; charset=utf-8
On 18/01/2021 09:33, Kraishak Mahtha wrote:
> Hi Team,
>
> What would be the maximum time difference that can be between a ISC?
> DHCP primary and failover server?
>
> Thanks in Advance
> -kraishak
>
> _______________________________________________
> ISC funds the development of this software with paid support subscriptions.
> Contact us at https://www.isc.org/contact/ for more information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>
"The trick is finding the balance between DHCP lease renewal time,
failover time, and server load."
https://stevendiver.com/2020/02/21/isc-dhcp-failover-configuration/
HTH.
------------------------------
Message: 2
Date: Mon, 18 Jan 2021 18:41:55 +0000
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Maximum Time difference between DHCP primary and DHCP
failover Server
Message-ID: <095379d1-ed68-409c-80fb-55a5a532b...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
Kraishak Mahtha <kraishak....@gmail.com> wrote:
> What would be the maximum time difference that can be between a ISC DHCP
> primary and failover server
AIUI, not a huge amount.
But I have to wonder at the question - do you have a problem with timekeeping ?
NTP will typically keep clocks accurate to millisecond accuracy which is a few
orders of magnitude better than is needed for failover.
Simon
------------------------------
Message: 3
Date: Mon, 18 Jan 2021 14:21:57 -0500
From: Thomas Markwalder <tm...@isc.org>
To: dhcp-users@lists.isc.org
Subject: Re: Maximum Time difference between DHCP primary and DHCP
failover Server
Message-ID: <bafba556-1b89-5f2f-1666-08d7a8f2c...@isc.org>
Content-Type: text/plain; charset=utf-8; format=flowed
The maximum skew is 60 seconds.
On 1/18/21 12:56 PM, Ed Daniel wrote:
> On 18/01/2021 09:33, Kraishak Mahtha wrote:
>> Hi Team,
>>
>> What would be the maximum time difference that can be between a ISC
>> DHCP primary and failover server
>>
>> Thanks in Advance
>> -kraishak
>>
>> _______________________________________________
>> ISC funds the development of this software with paid support subscriptions.
>> Contact us at https://www.isc.org/contact/ for more information.
>>
>> dhcp-users mailing list
>> dhcp-users@lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>
> "The trick is finding the balance between DHCP lease renewal time,
> failover time, and server load."
>
> https://stevendiver.com/2020/02/21/isc-dhcp-failover-configuration/
>
> HTH.
> _______________________________________________
> ISC funds the development of this software with paid support subscriptions.
> Contact us at https://www.isc.org/contact/ for more information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
Message: 4
Date: Tue, 19 Jan 2021 10:47:50 +1100
From: glenn.satch...@uniq.com.au
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Maximum Time difference between DHCP primary and DHCP
failover Server
Message-ID: <0d2ce50866d11157438157b1b41f3...@uniq.com.au>
Content-Type: text/plain; charset=US-ASCII; format=flowed
On 2021-01-19 05:41, Simon Hobson wrote:
> Kraishak Mahtha <kraishak....@gmail.com> wrote:
>
>> What would be the maximum time difference that can be between a ISC
>> DHCP primary and failover server
>
> AIUI, not a huge amount.
>
> But I have to wonder at the question - do you have a problem with
> timekeeping ? NTP will typically keep clocks accurate to millisecond
> accuracy which is a few orders of magnitude better than is needed for
> failover.
>
> Simon
Even if you are on an isolated network with no external access you could
set the two dhcp servers as NTP peers so they were synchronised to each
other.
regards,
Glenn
------------------------------
Message: 5
Date: Tue, 19 Jan 2021 05:34:17 -0600 (CST)
From: kraishak <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Re: Maximum Time difference between DHCP primary and DHCP
failover Server
Message-ID: <1611056057348-0.p...@n4.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi Simon
Thanks for Reply,
do you have a problem with timekeeping ? NTP will typically keep clocks
accurate to millisecond accuracy which is a few orders of magnitude better
than is needed for failover.
------->Actually I want add validation script so that for the given two
server address it can calculate the time difference and give me the results
for proceeding to add failover peer on not.
I checked in the ISC website documents but no where I can find what can be
the maximum time difference so I just want to know
Can you also please comment or share your experience if you have any, about
what could be the maximum network latency between the primary and failover
DHCP servers that does not impact the server performance
-Thanks in advance
Kraishak
--
Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
------------------------------
Message: 6
Date: Tue, 19 Jan 2021 05:38:31 -0600 (CST)
From: kraishak <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Re: Maximum Time difference between DHCP primary and DHCP
failover Server
Message-ID: <1611056311956-0.p...@n4.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi Thomas,
Thanks for sharing information, Can you also please comment or share your
experience if you have any, about what could be the maximum network latency
between the primary and failover DHCP servers that does not impact the
server performance
Thanks in advance
Kraishak
--
Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
------------------------------
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