isc-dhcpd offers ip already reserved

Glenn Satchell glenn.satchell at uniq.com.au
Thu Jun 5 05:20:56 UTC 2014


Creating a static address does not take it out of the dynamic range. So in
your dhcpd.conf you specify the range of IPs to be allocated dynamically
using the range statement inside a subnet or pool, eg:

range 192.168.0.10 192.168.0.99;

Then you use the host statement to allocate static IP addresses. The
static IPs must not be part of the dynamic range.

host blah {
  hardware  ethernet ....;
  fixed-address 192.168.0.105;
}

regards,
-glenn

On Thu, June 5, 2014 9:23 am, IT Support wrote:
> Hi dear John
>
> Yes I do, is it wrong this kind of setting?  This setting that I'm using
> is because of in the past I was getting a lot of ip conflicts between
> users asking to the dhcp server for a idle ip address, and a way to
> solve it, was give it to them fixed ip addres just for few to whom was
> getting  ip addres conflict.
>
> I'd like to find a work around for this issue.
>
> Thanks
>
>
>
> On 06/04/2014 03:24 PM, John Miller wrote:
>> Are your fixed addresses inside your pool?  If so, you'll want to
>> change that.
>>
>> John
>>
>>
>> On Wed, Jun 4, 2014 at 4:22 PM, IT Support <it.compilation at gmail.com
>> <mailto:it.compilation at gmail.com>> wrote:
>>
>>     Hi everyone,
>>
>>     I'm looking for some help, I'm facing a weird issue with
>>     isc-dhcpd-server ISC DHCPd version 4.1.1, for some users I need to
>>     define fix ip address in isc-dhcpd server, so in this way ip
>>     address are reserved for a particular host. So far is ok but
>>     sometimes (randomly) happend that my isc-dhcpd-server gives
>>     reserved ip address to a host looking for a idle from my pool
>>     address causing ip conflicts and denial of internet service or
>>     refuse of connections
>>
>>     Please somebody throwme a bone here?
>>
>>     thanks in advance
>>
>>     IT Support.
>>
>>     _______________________________________________
>>     dhcp-users mailing list
>>     dhcp-users at lists.isc.org <mailto:dhcp-users at lists.isc.org>
>>     https://lists.isc.org/mailman/listinfo/dhcp-users
>>
>>
>>
>>
>> --
>> John Miller
>> Systems Engineer
>> Brandeis University
>> johnmill at brandeis.edu <mailto:johnmill at brandeis.edu>
>> (781) 736-4619
>>
>>
>> _______________________________________________
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>> dhcp-users at lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>
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