Strange duplicate lease every min ...

Sébastien CRAMATTE s.cramatte at wanadoo.fr
Fri Jul 13 14:30:46 UTC 2007


This is my log

Jul 13 15:33:36 dhcp-cpe dhcpd: DHCPREQUEST for yy.yy.yy.yy
(xx.xx.xx.xx) from 00:80:5a:62:9f:2f via xx.xx.xx.xx
Jul 13 15:33:36 dhcp-cpe dhcpd: DHCPACK on yy.yy.yy.yy to
00:80:5a:62:9f:2f via xx.xx.xx.xx
Jul 13 15:33:38 dhcp-cpe dhcpd: DHCPREQUEST for yy.yy.yy.yy
(xx.xx.xx.xx) from 00:00:00:00:00:00via xx.xx.xx.xx
Jul 13 15:33:38 dhcp-cpe dhcpd: DHCPACK on yy.yy.yy.yy to
00:00:00:00:00:00via xx.xx.xx.xx
Jul 13 15:33:48 dhcp-cpe dhcpd: DHCPDISCOVER from 00:00:00:00:00:00via
xx.xx.xx.xx
Jul 13 15:33:48 dhcp-cpe dhcpd: DHCPOFFER on yy.yy.yy.yy to
00:00:00:00:00:00via xx.xx.xx.xx
Jul 13 15:33:50 dhcp-cpe dhcpd: DHCPDISCOVER from 00:00:00:00:00:00via
xx.xx.xx.xx
Jul 13 15:33:50 dhcp-cpe dhcpd: DHCPOFFER on yy.yy.yy.yy to
00:00:00:00:00:00via xx.xx.xx.xx
Jul 13 15:33:52 dhcp-cpe dhcpd: DHCPDISCOVER from 00:00:00:00:00:00via
xx.xx.xx.xx
Jul 13 15:33:52 dhcp-cpe dhcpd: DHCPOFFER on yy.yy.yy.yy to
00:00:00:00:00:00via xx.xx.xx.xx


yy.yy.yy.yy is the public IP of customer CPE
xx.xx.xx.xx  is the IP of the dhcp-relay


Simon Hobson escribió:
> Sébastien CRAMATTE wrote:
>
>   
>> Since few days I can observe a strange behaviour in our DHCP server.
>>     
>
> It's not neccessarily strange - but we can't tell without logs.
>
>   
>> I can see dhcp.leases file  that some are renewed each 2mn (see
>> dhcpd.leases extract below
>>     
>
> No it isn't that's every 2 SECONDS
>
>   
>>   starts 5 2007/07/13 12:25:54;
>>   starts 5 2007/07/13 12:25:56;
>>   starts 5 2007/07/13 12:25:58;
>>     
>
> We can't tell what the problem is without seeing 
> the logs that go with these leases, but my best 
> guess would be :
>
> 1) Client is not getting a response back from the 
> server in response to dhcp-request. It is 
> resending the request every 2s which results in 
> teh server creating a lease lease file entry each 
> time.
>
> 2) Client is getting response but not accepting it for some reason.
>
>
> First step is to look in your logs and tie-up 
> stuff in the logs with what's in the lease file - 
> that should give a bit more information about 
> what is going on.
>
>
>
>
>   



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