[Dnsmasq-discuss] Possible lease matching/reuse bug

[Tyler]

I warned you Kelleys! DON'T Cut 5G Towers Down! 

https://www.youtube.com/watch?v=3ZRcLOx8Ge0 


From: "Jerome Vuarand" <jerome.vuarand at gmail.com> 
To: "john doe" <johndoe65534 at mail.com> 
Cc: dnsmasq-discuss at lists.thekelleys.org.uk 
Sent: Tuesday, September 8, 2020 10:31:27 AM 
Subject: Re: [Dnsmasq-discuss] Possible lease matching/reuse bug 

On Tue, 8 Sep 2020 at 09:36, john doe <johndoe65534 at mail.com> wrote: 
>On 9/8/2020 9:19 AM, Jerome Vuarand wrote: 
>> I believe I'm triggering a bug where a static dhcp-host config does't 
>> seem to match the existing lease the second time that client connects. 
>> 
>> I'm running dnsmasq from a Raspberry Pi acting as a WiFi access point. 
>> I have a mixture of IoT devices connecting to it. I'd like most 
>> clients to get a dynamic IP address, but some to get a static one 
>> based on their name, so I use a combination of dhcp-range and 
>> dhcp-host. I have the following config: 
>> 
>> interface=ap0 
>> dhcp-range=192.168.4.100,192.168.4.250,255.255.255.0,24h 
>> domain=example.com 
>> dhcp-script=/home/pi/my_web_ui/dnsmasq_script 
>> dhcp-leasefile=/var/run/dnsmasq.leases 
>> dhcp-host=target 
>> 
>> And I have an entry in /etc/hosts that associate target to 
>> 192.168.4.2, the dnsmasq server itself is 192.168.4.1. 
>> 
> 
> Are you seeing the same thing if you do: 
> 
> 'dhcp-host=target,192.168.4.2' 

The problem happens too, yes. 

> The above assumes that the hosts file does not contain the Ip in question. 

I tested both cases, and all 4 combinations are problematic. Obviously 
with no hosts entry and no ip in dhcp-host dnsmaq has no way to know 
what IP I want to assign, but all three other combinations have the 
intermittent problem. 

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