Duplicated IP's

[Red1]

Hi
The best solution, is to dedicate one separate subnet for the fixed IPs , or remove a number of IPs you need to fix from the pool range. Another solution, is to enable ping on your CPEs , as the dhcp server (by default)try to ping the IP before serving it to a client.
 
Best Regards
Red1

On Feb 14, 2012, at 19:48, Randall C Grimshaw <rgrimsha at syr.edu> wrote:

> 
> If you combine your syslog for the two peer servers you will probably see that the conflicting address was offered by the peer but not accepted by the client - which did accept the alternate offer. You may not need to be concerned about this message. 
> I use the 'deny duplicates;' configuration option. it is documented in 'man dhcpd.conf' YMMV.
>  
> Randall Grimshaw rgrimsha at syr.edu
>  
> From: dhcp-users-bounces+rgrimsha=syr.edu at lists.isc.org [dhcp-users-bounces+rgrimsha=syr.edu at lists.isc.org] on behalf of Moayad mohammad [mailinglists at bluezonejordan.com]
> Sent: Tuesday, February 14, 2012 10:11 AM
> To: 'Users of ISC DHCP'
> Subject: RE: Duplicated IP's
> 
> Hi,
>  
> I moved all the reserved addresses out of the range pool, but still I got the same problem and found the following records in the log files
>                                 “uid lease xxx for client 00:33:19:01:0a:91 is duplicate on wimax”
>  
> Regards,
> Moayad
>  
> From: dhcp-users-bounces+mailinglists=bluezonejordan.com at lists.isc.org [mailto:dhcp-users-bounces+mailinglists=bluezonejordan.com at lists.isc.org] On Behalf Of José Queiroz
> Sent: Tuesday, February 14, 2012 5:08 PM
> To: Users of ISC DHCP
> Subject: Re: Duplicated IP's
>  
> Hi Mohammad,
> 
> Unfortunatelly I cannot help you in this problem with the urgency that you need. I suggest you to verify the condition that Chris Buxton said in his last message, and try to move the reserved addresses out of the address pool.
> 
> Em 14 de fevereiro de 2012 12:45, Moayad mohammad <mailinglists at bluezonejordan.com> escreveu:
> Dear Jose,
>                 Thank you for your email, but I need your help to review my dhcp configuration file.
>                
>                 I am sorry to disturb you and send email directly to your personal email without sending to the mailing list, I have urgent issue and I have to solve it.
> Thanks again.
>  
> Regards
>                
>  
>  
> From: dhcp-users-bounces+mailinglists=bluezonejordan.com at lists.isc.org [mailto:dhcp-users-bounces+mailinglists=bluezonejordan.com at lists.isc.org] On Behalf Of José Queiroz
> Sent: Sunday, February 12, 2012 8:48 PM
> To: Users of ISC DHCP
> Subject: Re: Duplicated IP's
>  
>  
> 2012/2/12 Moayad mohammad <mailinglists at bluezonejordan.com>
> Dears,
>                 I am facing problems with my DHCP server to serve our WiMAX customers (DHCP Version: dhcp-4.2.1-P1) as follows:
> 1-      sometimes the dhcpd service provide CPE with duplicated IP’s (Already assigned or reserved to other CPE), so the CPE connect for 1-2 seconds then disconnected then try again to connect and get the same duplicated IP then disconnected. To solve this issue I have to add new pool of IP’s.
> 
> 
> I remember a similar case, it was happening because the CPE were sending the same DHCP ID, or a bogus one (all zeros). Can you watch DHCP logs, and see what the problematic CPEs send to you?
> 
>  
>  
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> dhcp-users at lists.isc.org
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