Different pools for dynamic and "static" leases

Keith Lawson Keith.Lawson at sjhc.london.on.ca
Thu Mar 22 13:14:55 UTC 2007



>>> On Wed, Mar 21, 2007 at  2:40 PM, in message
<a06230912c2272c32399f@[192.168.0.149]>, Simon Hobson <dhcp1 at thehobsons.co.uk>
wrote: 
> Keith Lawson wrote:
> 
>>We've setup 2 pools in our subnet declarations. One pool is for 
>>dynamic clients and the other is for "static" clients that have host 
>>declarations with "fixed- address" options. We added the static pool 
>>since our servers are configured in a failover pair.
>>
>>Ex:
>>subnet 10.128.8.0 netmask 255.255.255.0 {
>>    option routers...
>>    # dynamic pool
>>    pool {
>>       options...
>>       range 10.128.8.16 10.128.8.200;
>>    }
>>   # static pool
>>    pool {
>>      options...
>>       range 10.128.8.201 10.128.8.250;
>>}
>>
>>Is there a way to stop dynamic hosts from getting addresses out of 
>>the static pool?
> 
> Yes REMOVE IT IMMEDIATELY !
> 
> You MUST NOT have an address which is both in a pool range statement 
> and also allocated via a fixed address statement -  the server does 
> NOT check and will quite happily give out an addresses to a dynamic 
> client and later attempt to give the same address to the fixed 
> address client.

How does failover and load balancing function then if the static IP's aren't part of any range statement? 


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