[Dnsmasq-discuss] Client DHCP Configuration Question

[Simon Kelley]

On 7/17/25 19:53, bad.cow5843 at fastmail.com wrote:
> Dear dnsmasq people,
> 
> This is not a problem with dnsmasq itself, but I don't know where else 
> to ask, so I am going ahead and I apologise in advance of it's off-topic.
> 
> I have been using dnsmasq for months with various clients and had no 
> trouble at all, until I tried a Debian client. The problem I have is 
> that the client attaches to two networks automatically: a wired one 
> which is connected to my dnsmasq server, and a wifi connection to a 
> router which is on another private subnet which is NOT routed by my 
> server. But when both interfaces are up the client tries to use the 
> wrong DNS server. It's the wrong one because it's not on the subnet my 
> server is routing. If only one of either of the Debian client's 
> interfaces is up it works fine.
> 
> So, is there anything I could potentially do in the dnsmasq 
> configuration to stop this behaviour? Is it even the right behaviour? 
> Maybe I should try raise it as a bug against Debian, but I am not sure 
> about this.
> 
> Apologies again if this is off-topic, just ignore it and be thankful 
> that I didn't put my questions in a zip file! :-)
> 


The source of the problem is the wifi router. Can you change its 
configuration so that it doesn't advertise a DNS server which doesn't work?

Cheers,
Simon.
> Ian
> 
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