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Today's Topics:
1. Re: fixed-address leases in dhcpd.leases (Sten Carlsen)
2. Re: fixed-address leases in dhcpd.leases (Andrew Bell)
3. Re: fixed-address leases in dhcpd.leases (Niall O'Reilly)
4. Re: fixed-address leases in dhcpd.leases (Simon Hobson)
----------------------------------------------------------------------
Message: 1
Date: Mon, 30 Mar 2020 18:12:37 +0200
From: Sten Carlsen <st...@s-carlsen.dk>
To: dhcp-users@lists.isc.org
Subject: Re: fixed-address leases in dhcpd.leases
Message-ID: <a5572a79-ef5e-069c-ff23-0ba0585cd...@s-carlsen.dk>
Content-Type: text/plain; charset=utf-8
According to my memory there was a discussion about the precise way to
set it with OMAPI.
I did not have the time to dig that conversation out. As I recall (could
be incorrect) the trick was to change a state or such to a specific
numerical value.
On 30-03-2020 17.48, Simon Hobson wrote:
> Andrew Bell <and...@poscomp.ca> wrote:
>
>> Ah, now I see. Yes, I was thinking of fixed addresses, not reserved leases.
>> I honestly didn't even know that was a thing until now.
> It's a relatively new feature, and I don't believe it was well (or at all ?)
> documented until recently. I only know about it from it being discussed on
> this list.
>
> Simon
>
> _______________________________________________
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
--
Best regards
Sten Carlsen
No improvements come from shouting:
"MALE BOVINE MANURE!!!"
------------------------------
Message: 2
Date: Mon, 30 Mar 2020 12:16:49 -0400
From: Andrew Bell <and...@poscomp.ca>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: fixed-address leases in dhcpd.leases
Message-ID:
<CAMcY7=jqbknmbgpdbpxuufrbpid4wjnfkcs88r2n_hcy6sh...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
FWIW, YMMV, etc.
I wrote a database system many years ago (which is still in use) to handle
this.
In a nutshell, it tracks a list of reserved addresses by subnet, and dumps
out a config fragment containing the fixed address entries. Then it
generates the subnet pools by iterating through the subnet ranges and
skipping the fixed addresses. So I get something like this:
host xxx { hardware ethernet xx.xx.xx.xx.xx.xx; fixed address 10.10.10.7; }
...
subnet 10.10.10.0 netmask 255.255.255.0 {
pool {
range 10.10.10.1 10.10.10.6;
range 10.10.10.8 10.10.10.254;
}
}
Obviously that's only a small fragment.
Whenever a change is made to the database the system regenerates the config
files and reloads the servers. Then it import/parse the dhcpd.leases file,
and put the last lease date in as a "last seen" attribute in the database.
Andrew
On Fri, Mar 27, 2020 at 3:21 PM Bob Harold <rharo...@umich.edu> wrote:
> +1
> I want to know when it last renewed its lease - recently, years ago, or
> never.
>
> --
> Bob Harold
>
>
>
> On Fri, Mar 27, 2020 at 2:46 PM Brennan,Andrew <andrew.bren...@drexel.edu>
> wrote:
>
>> I have wanted this for years - that lease entry would let me know whether
>> or not the machine is still configured to acquire it?s address via DHCP or
>> if the enduser has taken it upon themselves to manually configure the
>> host. If this ends up as a feature request, I?m +1 here.
>>
>> andrew.
>>
>> > On Mar 27, 2020, at 2:35 PM, Nate Collins <ncoll...@xes-inc.com> wrote:
>> >
>> > External.
>> >
>> > Hello,
>> >
>> > Is there a setting that controls whether or not fixed-address leases
>> > in dhcpd.conf will get added to the dhcpd.leases file? We have a
>> > use-case where we would like them to be, and they aren't on 4.3.3 (or
>> > we unknowingly have a setting preventing them from getting added). I
>> > took a look through the various manpages and didn't see anything
>> relevant.
>> >
>> > Thanks, Nate
>> > _______________________________________________
>> > dhcp-users mailing list
>> > dhcp-users@lists.isc.org
>> >
>> https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.isc.org%2Fmailman%2Flistinfo%2Fdhcp-users&data=02%7C01%7Candrew.brennan%40drexel.edu%7C9eed272971b14d28164408d7d27da854%7C3664e6fa47bd45a696708c4f080f8ca6%7C0%7C1%7C637209309455287580&sdata=3gXa4%2Bv5UEPNsi258bRY2z20UNcCFUB7JNA9fkALQTU%3D&reserved=0
>>
>> _______________________________________________
>> dhcp-users mailing list
>> dhcp-users@lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>
> _______________________________________________
> dhcp-users mailing list
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>
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Message: 3
Date: Mon, 30 Mar 2020 17:56:53 +0100
From: "Niall O'Reilly" <niall.orei...@ucd.ie>
To: "Users of ISC DHCP" <dhcp-users@lists.isc.org>
Subject: Re: fixed-address leases in dhcpd.leases
Message-ID: <f72297ae-927c-4f44-8482-6ad8ba856...@ucd.ie>
Content-Type: text/plain; charset="UTF-8"; format=flowed;
markup=markdown
On 30 Mar 2020, at 17:00, Bob Harold wrote:
> This sounds like a 'new' feature, I had not heard of it before, but
> when I check git blame at
> <https://gitlab.isc.org/isc-projects/dhcp/-/blame/master/server/dhcpd.conf.5>
>
> the lines referring?to 'reserved lease' are 9 and 13 years old.? Is
> it really that old?
That seems credible.
A method I've used for keeping track of whether a fixed address is still
active
is to pull the DORA entries from the log and use them to update a
last-seen database.
It's tedious, but effective.
Niall O'Reilly
------------------------------
Message: 4
Date: Mon, 30 Mar 2020 18:19:13 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: fixed-address leases in dhcpd.leases
Message-ID: <9e245444-558d-44b2-a79b-41da0abfc...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
Nate Collins <ncoll...@xes-inc.com> wrote:
> FWIW, we're in the same boat - we don't want to enable reserved leases for
> the entire dynamic pool for fear of running out of addresses, and would
> only enable it for specific fixed-address leases
I'm not sure you've followed this. You don't set the flag per pool, it's per
individual address - you'd only set it for devices you want to have a fixed
address.
So instead of setting a host entry with fixed-address, you create a lease and
set the reserved flag on it - either way it's one address "reserved" to that
client. You'd only run out of addresses if you keep reserving addresses for new
clients and not reclaiming ones no longer in use - exactly the same way you'd
run out of addresses if you keep creating new host declarations (and reducing
the dynamic pool to accommodate them).
Simon
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