openresolv-discuss

Hi, DNSMasq has an option to restrict the use of a DNS server to a 
specific interface. (format is server=1.2.3.4@eth1 )

For several situations I would like to limit my DNS as far as possible 
to specific upstream servers, however, in the case of captive portals 
and wifi access it's often necessary to compromise and allow some new 
DNS server to be used since others might be blocked.  I would like to 
avoid "tainting" traffic by avoiding that DNS server where I can

Ideally this is a feature request that dhcpcd can be set to restrict dns 
to just that interface and in turn it indicates this to openresolv, 
which in turn would only support this on the subset of resolvers which 
can limit requests by interface

I'm not actually sure that this isn't a very common use case for the 
situation of having a globally accessible DNS 
(OpenDNS/GoogleDNS/Something Else), but various interfaces are trying to 
add additional DNS servers.  Eg adding my 3G data card as an available 
backup route is currently adding those DNS entries even though I might 
be using a DSL line at present.  DNSmasq is smart enough to latch on to 
the "fastest responding server", but in the event that not all DNS 
servers are the same, then I would prefer to lock the 3G DNS server to 
only be available over that 3G connection.

Would you consider such a feature request? Is there some existing 
ability that I might have overlooked that can implement this?

Thanks

Ed W