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Today's Topics:
1. Re: MAC randomisation and DHCP pools (Mike Richardson)
2. Re: MAC randomisation and DHCP pools (Bill Shirley)
3. Re: MAC randomisation and DHCP pools (Mike Richardson)
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Message: 1
Date: Sun, 26 Jul 2020 13:40:11 +0100
From: Mike Richardson <mike.richard...@manchester.ac.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: MAC randomisation and DHCP pools
Message-ID: <20200726124011.gc8...@jadzia.mcc.ac.uk>
Content-Type: text/plain; charset=us-ascii
> I think in the short term setting the lease time to 24 hours would free up
> old leases after the MAC address changes, meaning the old client effectively
> goes away. Public places like shopping malls, should already have shorter
> leases due to the massive churn in clients, so it's not going to bother them
> much.
Thanks for the advice but I'm really trying to understand what the behaviour
of DHCP would be in the original scenario (100 addresses, 50 clients, 7 days
lease).
> >>I'm just trying to evaluate the impact on things like DHCP, but I'm
> >>not sure
> >>about exactly what happens when pools are, sort of, exhausted.
Thanks,
Mike
--
Mike Richardson
------------------------------
Message: 2
Date: Sun, 26 Jul 2020 15:13:16 -0400
From: Bill Shirley <b...@c3po.polymerindustries.biz>
To: dhcp-users@lists.isc.org
Subject: Re: MAC randomisation and DHCP pools
Message-ID:
<38e63b08-cbb2-11c9-8a2f-2aa0d518c...@c3po.polymerindustries.biz>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Did you see my reply about:?
adaptive-lease-time-threshold 75;?????? # use min-lease-time when pool is above
this percent
Bill
On 7/26/2020 8:40 AM, Mike Richardson wrote:
>> I think in the short term setting the lease time to 24 hours would free up
>> old leases after the MAC address changes, meaning the old client effectively
>> goes away. Public places like shopping malls, should already have shorter
>> leases due to the massive churn in clients, so it's not going to bother them
>> much.
> Thanks for the advice but I'm really trying to understand what the behaviour
> of DHCP would be in the original scenario (100 addresses, 50 clients, 7 days
> lease).
>
>>>> I'm just trying to evaluate the impact on things like DHCP, but I'm
>>>> not sure
>>>> about exactly what happens when pools are, sort of, exhausted.
> Thanks,
>
> Mike
>
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Message: 3
Date: Mon, 27 Jul 2020 10:34:27 +0100
From: Mike Richardson <mike.richard...@manchester.ac.uk>
To: dhcp-users@lists.isc.org
Subject: Re: MAC randomisation and DHCP pools
Message-ID: <20200727093427.gd8...@jadzia.mcc.ac.uk>
Content-Type: text/plain; charset=us-ascii
On Sun, Jul 26, 2020 at 03:13:16PM -0400, Bill Shirley wrote:
> Did you see my reply about:?
> adaptive-lease-time-threshold 75; # use min-lease-time when
> pool is above this percent
I did and thanks for the information, that sounds very useful in the
circumstances but I'm not after a solution to a problem, I'm just trying to
understand the behaviour of the server in a given configuration. I have to
write up a 'these are the implications' type summary to be sent to a large
number of different organisations and knowing what happens when using longer
leases will help. I don't know their configurations and can't dictate to
them. All I can do is say "if you're doing X then Y happens".
Thanks,
Mike
--
Mike Richardson
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End of dhcp-users Digest, Vol 141, Issue 16
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