sandrock at mac.com
Thu Jul 23 15:15:43 UTC 2015
In the Infoblox product, which is based on
ISC DHCP, expired leases can be scavenged,
after a specified time has elapsed.
Setting scavenging to be done immediately
would seem compatible with what the OP
I have no connection with Infoblox other
than working with their DDI product, and
hope it's okay to mention them.
> On Jul 23, 2015, at 8:25 AM, Niall O'Reilly <niall.oreilly at ucd.ie> wrote:
> On Thu, 23 Jul 2015 09:30:56 +0100,
> richard lucassen wrote:
>> Is it somehow possible to create a pool that "forgets" which ip address
>> had been assigned to a particular host once the max-lease-time has
>> Goal: I want to have a pool from:
>> 192.168.65.128 to 192.168.65.254
>> The first host gets 128, the 2nd 129 etc. The max-lease-time is 300s. I
>> switch off the two hosts. After 10 minutes I take two different hosts.
>> Now I would like that dhcpd assigns ip 128 and 129 again to the new
> IIUC, your goal is not compatible with the usual reading of the
> following extract from RFC2131.
> 2.2 Dynamic allocation of network addresses
> The second service provided by DHCP is the allocation of temporary or
> permanent network (IP) addresses to clients. The basic mechanism for
> the dynamic allocation of network addresses is simple: a client
> requests the use of an address for some period of time. The
> allocation mechanism (the collection of DHCP servers) guarantees not
> to reallocate that address within the requested time and attempts to
> return the same network address each time the client requests an
> The second part of the last sentence ("and attempts to return
> the same network address ...") is key. Until the pool is exhausted,
> the server meets this requirement by leasing a fresh, unused address.
> Best regards,
> Niall O'Reilly
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