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<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am currently building a Network Access Control system, and in order to keep it “out of band” (via a layer 3 firewall), I would ideally like to use a DNS redirect to direct people to the NAC server from a registration VLAN.<o:p></o:p></p>
<p class="MsoNormal">I am having issues with doing a redirect with some exceptions (the registration VLAN needs access to the University Shibboleth servers and the IT registration pages which are outside the College network).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Now I realise that I am not the first person to try and do this, so I searched the mailing list for similar discussions.<o:p></o:p></p>
<p class="MsoNormal"><a href="https://www.unbound.net/pipermail/unbound-users/2010-April/001134.html">https://www.unbound.net/pipermail/unbound-users/2010-April/001134.html</a><o:p></o:p></p>
<p class="MsoNormal"><a href="https://www.unbound.net/pipermail/unbound-users/2010-May/001171.html">https://www.unbound.net/pipermail/unbound-users/2010-May/001171.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Based on what I found (and read in the annotated unbound.conf file) I realised that something like this should work:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">local-zone: "." redirect<o:p></o:p></p>
<p class="MsoNormal">local-data: ". A <NAC server ip>"<o:p></o:p></p>
<p class="MsoNormal">local-zone: "google.co.uk" transparent<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This however doesn’t seem to work as I would expect it to, as everything is redirected by the local-data to the NAC server ip.<o:p></o:p></p>
<p class="MsoNormal">(note: changing this to “refuse” rather than “redirect” works as expected, can connect to google.co.uk, get refused for everything else)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I thought this might be a version issue, as CentOS 7 is packaged with an older version (1.4.20??) and I know that in recent versions additional options were added for the zone types.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So I compiled 1.6.0 from source and experienced the same behaviour, even when attempting to use always_transparent , I tried all sorts of other iterations of options and none worked as I had hoped…<o:p></o:p></p>
<p class="MsoNormal">Noticing that I can find multiple references to the above example, has the behaviour of Unbound changed?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If so how do I accomplish the above, I would expect the “always_transparent” would have been the answer if the local-data was the cause of the behaviour:<o:p></o:p></p>
<p class="MsoNormal">“always_transparent Like transparent, but ignores local data and resolves normally.”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But this still doesn’t work as expected when using a redirect.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Simon Wedge<o:p></o:p></p>
<p class="MsoNormal">St Antony’s College<o:p></o:p></p>
<p class="MsoNormal">University of Oxford<o:p></o:p></p>
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