[Dnsmasq-discuss] No DHCP leases handed on bridge interface

[Albert ARIBAUD]

Bonjour,

Le Sat, 16 Jul 2016 07:15:55 +0000 (UTC)
Sébastien Delafond <seb at debian.org> a écrit:

> On 2016-07-15, Albert ARIBAUD <albert.aribaud at free.fr> wrote:
> > No mention of the interfaces it binds to and how? No functional
> > equivalent to the interface-related options of dnsmasq?  
> 
> You can pass interfaces to bind to on the command-line, but it wasn't
> necessary in my case.
> 
> > Which seems to imply that dnsmasq makes the difference based on the
> > interface it receives the request on -- hence my asking how ISC dhcp
> > chooses the interfaces it listens to... and how dnsmasq does it.
> >
> > You might want to check whether the bridge is brought up before or
> > after dnsmasq is started.  
> 
> It's up before I start dnsmasq.

OK.

> > Also, try combinations of interface= and bind-interfaces.  
> 
> I've tried with "interface=br.eth0-2 bind-interfaces" but the behavior
> stays the same.
> 
> > Also, checkout bridge-interface= if it is available in your version
> > of dnsmasq.  
> 
> From the man page, I had assumed bridge-interface would play a role
> only if the bridge interface wasn't assigned an IP.

Indeed, but it was still worth trying, in case the manpage and code did
not agree.

> With "interface=eth0.2 bind-interfaces
> bridge-interface=eth0.2,br.eth0-2", dnsmasq refuses to stop with
> "unknown interface eth0.2", which seems to be a generic message
> saying that the interface doesn't have an IP.
> 
> With "interface=br.eth0-2 bind-interfaces
> bridge-interface=eth0.2,br.eth0-2", dnsmasq clearly states
> "dnsmasq-dhcp: DHCP, sockets bound exclusively to interface br.eth0-2
> " when starting, and I don't get DHCP leases either.
> 
> With "interface=* bind-interfaces bridge-interface=eth0.2,br.eth0-2",
> no obvious changes.
> 
> Not passing bind-interfaces doesn't seem to affect the result of those
> tests.

Alright... I'm out of ideas, sorry -- apart from recompiling dnsmasq
with ad hoc debug code. :/

> Cheers,
> 
> --Seb

Amicalement,
-- 
Albert.