ISC DHCPD giving out reserved IPs for non-reserved hosts

[Scott Lacy]

So Microsoft DHCP's behavior of reserving addresses specifically for 
certain MACs is not standard?  That's the first DHCP product I've used 
(I know, I know), so I was assuming that ISC dhcpd would behave the same 
way.


Scott


John Wobus wrote:
> It's possible you are seeing normal behavior.  If you are using host 
> declarations
> to attempt to reserve addresses, you are under a misimpression.  Host 
> declarations
> do not reserve addresses; they merely tell the server to give a certain
> answer when they receive a certain MAC address.
> You reserve addresses by leaving them out of the configured ranges
> that are dynamically allocated.
>
> John Wobus
>
> On Jul 6, 2007, at 3:31 PM, Scott Lacy wrote:
>
>   
>> I have a DHCP server running ISC DHCPD v3.0.3 on Fedora Core.  I am
>> having an issue where dhcpd is giving out leases for reserved IP
>> addresses to hosts other than that which the addresses are reserved
>> for.  There are no indication in the logs of any conflicts.  The logs
>> look fairly vanilla and there was no indication of any trouble until I
>> got a call about an IP conflict with the machine the reservation is
>> for.  The only quick way to resolve the problem was to power down the
>> offending device.  Even removing the newly-issued lease from DHCP and
>> having the other device pull an address did not seem to help.
>>
>> Is there anything that jumps out to any of you as far as things I 
>> should
>> check my configuration for?  I've run this installation for almost a
>> year and I've had this come up twice in the last month, both on 
>> networks
>> that were set up in DHCP long ago.
>>
>>
>> Thanks,
>>
>> Scott Lacy
>> Systems Manager
>> Mercer University
>>
>>
>>
>>     
>
>
>