Max num of static entries

pat patkumar82 at
Mon Aug 16 14:50:49 UTC 2010

Hi Marc,

   even iam looking for the same, and we assign the static IP with
fixed-address statement tied to MAC address any calculations how much memory
will be required for 10K static address, if not can you specify your server
config and how much memory is consumed while the service is restarted.


On 8/16/10, Marc Perea <marccp at> wrote:
>  Hi loganathan,
> How are you assigning the static addresses? From a pool of one IP per
> client, or with the fixed-address statement tied to some host entry? (i.e.
> class based or host based matching) We currently have over 13,000+ static
> host entries in production and dhcpd restarts in under a second when taking
> config changes and operates perfectly. As an added bonus, static assignment
> allows us to duplicate the config to N servers for redundancy without having
> to run any failover protocols.
> On the other hand, we used to do class based matching and a pool of one IP
> per client, and things were very painful. dhcpd would take over a minute to
> restart and accept config changes, and would also have exceptionally poor
> performance (<5 DORA/s processing).
> I don't know if there's a cap, but if there is it is easily higher than 13k
> and change. I suspect the only limitation is your system memory.
> As the standard warning I've heard in the past, if you decide to match on
> something like MAC to assign these static IPs, beware of spoofing and be
> aware that this is by no means securing the network.
> --Marc
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