Dhcpd randomly returns the IP address or the backup IP

Sten Carlsen stenc at s-carlsen.dk
Fri Mar 26 17:31:49 UTC 2021


Thanks

Sten

> On 26 Mar 2021, at 08.43, Wayne Gemmell | Connect <wayne at connect-mobile.co.za> wrote:
> 
> Thanks Sten
> 
> I've moved my class out of the subnet  and the issue still persists.

Well, that is one can of worms out of the picture.

What are the two addresses?


> 
> 
>  <https://connect-mobile.co.za/mobile_marketing_solutions/>
> 
> 
> On Thu, 25 Mar 2021 at 17:51, Sten Carlsen <stenc at s-carlsen.dk <mailto:stenc at s-carlsen.dk>> wrote:
> You define the class kannel inside the subnet, so if there are any other subnets, it will be defined there as well. Class definitions are global always, defining them inside a subnet may have some "interesting" side effects as some options are taken from that subnet even if the host gets an address in a different subnet - routers is one of them.
> 
> So one thought is, if the backup address is not in this subnet, the host will be given incorrect information.
> 
> -- 
> Best regards 
> Sten Carlsen 
> 
> --------------------------------------------------
> Aoccdrnig to rseerach at Cmabrigde Uinervtisy,
> it deosn't mttaer in waht oredr the ltteers in a
> wrod are, the olny iprmoatnt tihng is taht the
> frist and lsat lteter be at the rghit pclae.
> The rset can be a ttoal mses and you can slitl
> raed it wotihut porbelm. Tihs is bcuseae the
> hmuan mnid deos not raed ervey lteter by istlef,
> but the wrod as a wlohe. Amzanig, huh?
> --------------------------------------------------
> 
>> On 25 Mar 2021, at 13.01, Wayne Gemmell | Connect <wayne at connect-mobile.co.za <mailto:wayne at connect-mobile.co.za>> wrote:
>> 
>> I tried it. No change. The issue still persists. 
>> 
>> 
>>  <https://connect-mobile.co.za/mobile_marketing_solutions/>
>> 
>> 
>> On Tue, 23 Mar 2021 at 16:19, Wayne Gemmell | Connect <wayne at connect-mobile.co.za <mailto:wayne at connect-mobile.co.za>> wrote:
>> I'll give it a try, thanks. 
>> 
>> 
>>  <https://connect-mobile.co.za/mobile_marketing_solutions/>
>> 
>> 
>> On Tue, 23 Mar 2021 at 01:32, Bill Shirley <bill at c3po.polymerindustries.biz <mailto:bill at c3po.polymerindustries.biz>> wrote:
>> Try:
>> update-optimization             off;
>> 
>> Bill
>> 
>> On 3/19/2021 2:22 AM, Wayne Gemmell | Connect wrote:
>>> Hi
>>> 
>>> When my dhcp server gets a DHCPRELEASE followed by a DHCPDISCOVER then it randomly allocates the IP address or the backup IP address that are assigned to the host in the lease file to the host. The assignments always got to the correct host and the mac address doesn't change.
>>> 
>>> When this backup IP address is allocated then dynamic DNS isn't updated and my container is unreachable. 
>>> 
>>> I've put all the relevant details in the link below but am more than happy enough to furnish anything that is missing. Can anyone help please?
>>> 
>>> https://gitlab.isc.org/isc-projects/dhcp/-/issues/172 <https://gitlab.isc.org/isc-projects/dhcp/-/issues/172>
>>> 
>>>  <https://connect-mobile.co.za/mobile_marketing_solutions/>
>>> 
>>> 
>>> _______________________________________________
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> 
> _______________________________________________
> ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ <https://www.isc.org/contact/> for more information.
> 
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