DHCPD Leases, no way to clean the file?

[glenn.satchell at uniq.com.au]

Hi Jorge

This is from the dhcpd.conf man page:

          The one-lease-per-client statement

             one-lease-per-client flag;

             If this flag is enabled, whenever a client sends a 
DHCPREQUEST for
             a particular lease, the server will automatically free  any  
other
             leases the client holds.  This presumes that when the client 
sends
             a DHCPREQUEST, it has forgotten any lease  not  mentioned  
in  the
             DHCPREQUEST - i.e., the client has only a single network 
interface
             and it does not remember leases it's holding on networks to  
which
             it  is  not  currently attached.  Neither of these 
assumptions are
             guaranteed or provable, so we urge caution  in  the  use  of 
  this
             statement.

So you could use:

one-lease-per-client true;

This is not always what you might want though. dhcpd follows the RFC 
precisely, and this means that if you connect to a particular subnet it 
should try to give you the same IP address as you had last time. Setting 
one-lease-per-client means it will forget the leases on other subnets. 
This is why it's a settable parameter - the default is the "safer" 
option.

The man pages for dhcpd.conf, dhcpd, dhcpd.leases, dhcp-eval are worth 
looking at if you haven't

regards,
Glenn

On 2022-08-21 20:03, Jorge Bastos wrote:
> Howdy,
> 
> I've started using DHCPD, and noticed that the lease file is not
> "cleaned",
> What I mean is, if some cliente request IP, and get .....11, and after
> two days/another time request again after the lease time ends, and the
> ......11 is already in someone else, it will get a new IP, so far so
> good.
> But the lease file stays with the information about the old lease,
> aswell the new one.
> 
> No way to make it have only the new lease for that MACADDRR? for
> example like it does the MSWindows DHCPD.
> I've been searching docs and did not found any information about it,
> but did found people exposing extra large dhcpd.leases file (+1GB),
> aswell others saying that their dhcpd.leases file dont have more than
> 50 or 100kb
> 
> Thanks in advanced,