[Dnsmasq-discuss] SMTP server DNS resolution

richardvoigt at gmail.com richardvoigt at gmail.com
Fri Feb 9 22:50:20 GMT 2007


On 2/9/07, Charles Marcus <CMarcus at media-brokers.com> wrote:
> Edson wrote:
> > Then try this approach:
> >
> > Internet <-> OpenDNS <-> [DNSmasq<->SMTP+SAMBA]
> >                  \-----> DNSMasq <->LAN
>
> This is not what I want, but your graphical representation helped to
> clarify what I *do* want. The main point is, I do NOT want my smtp
> server to use the OpenDNS servers for its cache misses. I want it to
> only use the authoritative root servers.

DNSmasq cannot do recursive queries, which are required when using the
root servers, since they do not fully resolve your queries.  DNSmasq
only does caching, and redirects to a fully functional DNS server on
each cache miss.

>
> So:
>
> OpenDNS servers
>         |
>         DNSMasqCache/Forwarders1 \             / - Samba/LAN
>                                   -- DNSMasq --
>         DNSMasqCache/Forwarders2 /             \ - SMTP server
>         |
> Internet Root Servers
>
> It would be cool if I could simply tell DNSMasq to use one
> cache/forwarders for all requests coming in from a specific local IP
> address, and a *different* cache/forwarders for all other requests.
>
> Unless it is already possible to do this with DNSMasq right now with
> just one instance, then it makes the most sense to just run two separate
> instances, as you suggested (but making the SMTP server being the one on
> its own, and letting the Samba/LAN share one).
>
> Thanks for helping me clarify how to do this.
>
> --
>
> Best regards,
>
> Charles
>
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