fixed-address leases in dhcpd.leases

[Nate Collins]

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 (but since fixed-address
leases aren't part of the dynamic pool, the option is irrelevant).

----- Original Message -----
From: "Bob Harold" <rharolde at umich.edu>
To: "dhcp-users" <dhcp-users at lists.isc.org>
Sent: Monday, March 30, 2020 10:18:19 AM
Subject: Re: fixed-address leases in dhcpd.leases

To get the effect I am looking for, I would have to make a pool of one host with a range of one host, for each host that needs a permanent address, and still have it logged in the leases file. That gets pretty messy. 

-- 
Bob Harold 


On Mon, Mar 30, 2020 at 10:52 AM Andrew Bell < [ mailto:andrew at poscomp.ca | andrew at poscomp.ca ] > wrote: 



Do you want to reserve an address inside the dynamic pool? I'm not sure if that works, honestly, but I just set aside space in each subnet for reserved addresses and make the pool smaller. 

Andrew 

On Mon, Mar 30, 2020 at 10:15 AM Bob Harold < [ mailto:rharolde at umich.edu | rharolde at umich.edu ] > wrote: 



I see now that "reserved lease" is documented in: 
[ https://kb.isc.org/docs/isc-dhcp-44-manual-pages-dhcpdconf | https://kb.isc.org/docs/isc-dhcp-44-manual-pages-dhcpdconf ] 

But until it is supported in dhcpd.conf and/or the various DDI vendors (Infoblox, BlueCat, etc), it will be difficult to use. 
An option in a "host" statement to make it "reserved" would be great. 

-- 
Bob Harold 



On Fri, Mar 27, 2020 at 5:42 PM Simon Hobson < [ mailto:dhcp1 at thehobsons.co.uk | dhcp1 at thehobsons.co.uk ] > wrote: 


Nate Collins < [ mailto:ncollins at xes-inc.com | ncollins at xes-inc.com ] > wrote: 

>Is there a setting that controls whether or not fixed-address leases 
>in dhcpd.conf will get added to the dhcpd.leases file? 

No, they aren't and never have been. 

What you can do is use a reserved lease. Once reserved, the lease will never get re-allocated to another client and acts very much like a host entry with fixed address. But, unlike the fixed-address statement, a reserved lease goes through the normal lifecycle so you can see it's state in the leases file. 

Simon 
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