[Dnsmasq-discuss] Tagging DHCP request (network-id) by the incoming interface - possible?

[Daniel Lohmann]

Simon,

Thank you very much for your anwser!

 > I don't think what you are asking for is possible: once the packet is
 > bridged and arrives on the bridge interface, there's no way to
 > determine
 > where is came from: the layer-two bridging is transparent
 > to the higher levels.

I see. I was expecting some fundamental point which makes this impossible.



> You might be able to keep the more traditional scheme with dnsmasq 
> listening on the two interfaces without losing the bridge provided that 
> you can divide your subnet into two.
> 
> It's best to illustrate this with an example.
> 
> Assume subnet is 192.168.1.xx (netmask 255.255.255.0)
> and the bridge interface has address 192.168.1.10
> 
> Now also configure the lan and wifi interfaces as
> 
> 192.168.1.1/255.255.255.128 - lan
> 192.168.1.129/255.255.255.128 - wifi
> 
> you can now configure dnsmasq to do dhcp on those two interfaces with 
> whatever policies you like, provided that lan clients are in the first 
> half of the address range and wifi ones in the second.
> 
 > [...many more helpful explanations ...]

That sounds indeed like a possible solution! I will try it out as soon 
as possible and post my results to the list.


Thanks!

Daniel