m...@lamarciana.com:
>> eth0 is an uplink to sys-net. And /etc/resolv.conf there indeed is
>> generated, so manual changes will be lost. There is a way to avoid this
>> using /etc/qubes/protected-files.d/, but I think it isn't the way to go.
>> Better adjust NetworkManager settings in sys-net, using standard
>> connection editor GUI. The DNS servers in any other VM are in the end
>> pointing to what you have in sys-net(*) (using DNAT redirections). 
>>
>> (*) unless you use Tor/Whonix - in which case those are redirected to
>> tor process.
> 
> Thanks for your answer.
> 
> Does it mean that all VM have to share the same DNS settings (except 
> Tor/Whonix)? What I was trying to do is routing only one of them through 
> OpenDNS, while keeping the rest with my ISP DNS server (and I would like to 
> avoid an HVM just for that).
> 
> I see I can create a new "NetVM" but I'm not sure if it is full supported. If 
> I create a new one, is the GUI adapted so that I can configure both (sys-net 
> and my custom one)? I prefer to ask before trying it and risking leaving 
> something in an inconsistent state.
> 



I would suggest trying to completely disable or get rid of
NetworkManager in that ProxyVM (you shouldn't need it, especially just
to redirect DNS), then see if /etc/resolv.conf changes become
persistent. If not, you could still use /rw/config/rc.local to replace
/etc/resolv.conf on boot.

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