[Dnsmasq-discuss] DHCP renewal fails if a DHCP relay is used

[Simon Kelley]

On 4/1/25 19:51, Zak Kemble wrote:
> Hi, I'm running dnsmasq/Pi-Hole in a docker container with bridged 
> networking and dhcp-helper to forward broadcasts to the Pi-Hole 
> container. This is working, but DHCP renewals that send unicast packets 
> to the DHCP server (specified by the server-identifier option) will fail 
> because dnsmasq is using the containers internal IP for this option. 
> Would it be possible to allow overriding of server-identifier so that it 
> can be set to the docker host/relay IP? I think a similar thing has been 
> mentioned here https://dnsmasq-discuss.thekelleys.org.narkive.com/ 
> M9Rwt2oy/cannot-override-dhcp-server-identifier-option-54 <https:// 
> dnsmasq-discuss.thekelleys.org.narkive.com/M9Rwt2oy/cannot-override- 
> dhcp-server-identifier-option-54> but that was 10 years ago lol
> 
> Here's my original issue where I was directed to email you guys https:// 
> github.com/pi-hole/FTL/issues/2397 <https://github.com/pi-hole/FTL/ 
> issues/2397>
> 

I think the dnsmasq option dhcp-proxy should solve this problem.


Cheers,

Simon.