[Dnsmasq-discuss] Leases file is not updated and dhcp-script is not called if Requested-IP is in the pool.

Simon Kelley simon at thekelleys.org.uk
Sat Aug 28 10:23:30 UTC 2021



On 27/08/2021 20:38, Vallevand, Mark K wrote:
> Short follow-up question.
> If the client does not supply a hostname, what will be recorded in the lease
> file and passed to the script?

In the lease file, the hostname field gets replaced with *
The hostname is the last argument to the script, and it's ommitted (so,
two arguments rather than three.

Cheers,

Simon.

> 
> Mark K Vallevand
> Unisys | 651-635-7708 | mark.vallevand at unisys.com 
> 
> 
> 
> THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
> MATERIAL and is for use only by the intended recipient. If you received this
> in error, please contact the sender and delete the e-mail and its
> attachments from all devices.
>    
> 
> Outside of a dog, a book is man's best friend.
> Inside of a dog, it's too dark to read.
> -  Groucho
> 
> 
> -----Original Message-----
> From: Dnsmasq-discuss <dnsmasq-discuss-bounces at lists.thekelleys.org.uk> On
> Behalf Of Vallevand, Mark K
> Sent: Friday, August 27, 2021 2:06 PM
> To: Simon Kelley <simon at thekelleys.org.uk>;
> dnsmasq-discuss at lists.thekelleys.org.uk
> Subject: Re: [Dnsmasq-discuss] Leases file is not updated and dhcp-script is
> not called if Requested-IP is in the pool.
> 
> EXTERNAL EMAIL - Be cautious of all links and attachments.
> 
> WooHoo.
> Dhcp-authoritative did the trick!
>>From the fire, my bacon has been pulled.
> Thanks!
> 
> 
> Mark K Vallevand
> Unisys | 651-635-7708 | mark.vallevand at unisys.com
> 
> 
> 
> THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
> MATERIAL and is for use only by the intended recipient. If you received this
> in error, please contact the sender and delete the e-mail and its
> attachments from all devices.
> 
> 
> Outside of a dog, a book is man's best friend.
> Inside of a dog, it's too dark to read.
> -  Groucho
> 
> 
> -----Original Message-----
> From: Simon Kelley <simon at thekelleys.org.uk>
> Sent: Friday, August 27, 2021 1:31 PM
> To: Vallevand, Mark K <Mark.Vallevand at UNISYS.com>;
> dnsmasq-discuss at lists.thekelleys.org.uk
> Subject: Re: [Dnsmasq-discuss] Leases file is not updated and dhcp-script is
> not called if Requested-IP is in the pool.
> 
> EXTERNAL EMAIL - Be cautious of all links and attachments.
> 
> On 27/08/2021 15:45, Vallevand, Mark K wrote:
>> I do clear the leases database as described.
>>
>> I have tried a newer version of dnsmasq and experimented with
>> script-on-renewal.  It really didn't seem to help with the problem.
>>
>> Here is what I do and see (v 2.79)
>> - stop dnsmasq
>> - erase leases file
>> - write config file
>> - start dnsmasq
>> - client request with preferred ip in configured pool
>> - leases file *is not* updated
>> - dhcp-script *is not* called
>> - client request completes and begins to use the address
>> - client request to renew lease
>> - leases file *is* updated (yay)
>> - dhcp-script *is* called with 'add' (yay)
>>
>> Subsequent client lease renews do not see the dhcp-script called.
> Expected.
>> With a newer version, 2.86rc1, and script-on-renewal set, the subsequent
>> client lease renews *do* see the dhcp-script called with 'old'.  Again,
> this
>> is expected.  But, the behavior of dnsmasq does not otherwise change with
>> the newer version.
>>
>> So, why is the lease file not getting updated?
>>
>> When the initial client request has a preferred ip outside the pool or is
>> not included, it seems like things work as expected.
>>
> 
> 
> Are you setting the dnsmasq option --dhcp-authoritative
> Could you set the dnsmasq option --log-dhcp and post the resulting logs
> when you go through the procedure above?
> 
> Cheers,
> 
> Simon.
> 
> 
> 



More information about the Dnsmasq-discuss mailing list