rich1.0phorkiehttps://p.cweiske.de/Unify Gateway: Content filter filters ALL DNS requests to ALL serversChristian Weiske86400900900<!-- embedding all files of https://p.cweiske.de/978 -->
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<p>Using <tt class="docutils literal">dig @1.2.3.4 domain.tld</tt> is not sent to 1.2.3.4, but answered by the Unify Gateway.
This prevents using custom DNS servers.</p>
<p>Note the similar TTL numbers for the requests to different DNS servers in the example output.</p>
<div class="section" id="solution">
<h1>Solution</h1>
<p>Disabling content filtering stops that behavior.</p>
<p>Using DoH (DNS over HTTPS) also gives correct results.</p>
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</pre></td><td class="de1"><pre class="de1">$ <span class="kw2">dig</span> +nocomments <span class="sy0">@</span>9.9.9.9 cweiske.de
 
; <span class="sy0"><<>></span> DiG 9.20.26-<span class="nu0">1</span>~deb13u1-Debian <span class="sy0"><<>></span> +nocomments <span class="sy0">@</span>9.9.9.9 cweiske.de
; <span class="br0">(</span><span class="nu0">1</span> server found<span class="br0">)</span>
<span class="sy0">;;</span> global options: +cmd
;cweiske.de.                    IN      A
cweiske.de.             <span class="nu0">3477</span>    IN      A       159.195.22.112
<span class="sy0">;;</span> Query time: <span class="nu0">0</span> msec
<span class="sy0">;;</span> SERVER: 9.9.9.9<span class="co0">#53(9.9.9.9) (UDP)</span>
<span class="sy0">;;</span> WHEN: Fri Aug <span class="nu0">21</span> <span class="nu0">15</span>:<span class="nu0">10</span>:07 CEST <span class="nu0">2026</span>
<span class="sy0">;;</span> MSG SIZE  rcvd: <span class="nu0">65</span>
 
 
$ <span class="kw2">dig</span> +https +nocomments <span class="sy0">@</span>9.9.9.9 cweiske.de
 
; <span class="sy0"><<>></span> DiG 9.20.26-<span class="nu0">1</span>~deb13u1-Debian <span class="sy0"><<>></span> +https +nocomments <span class="sy0">@</span>9.9.9.9 cweiske.de
; <span class="br0">(</span><span class="nu0">1</span> server found<span class="br0">)</span>
<span class="sy0">;;</span> global options: +cmd
;cweiske.de.                    IN      A
cweiske.de.             <span class="nu0">43200</span>   IN      A       159.195.22.112
<span class="sy0">;;</span> Query time: <span class="nu0">47</span> msec
<span class="sy0">;;</span> SERVER: 9.9.9.9<span class="co0">#443(9.9.9.9) (HTTPS)</span>
<span class="sy0">;;</span> WHEN: Fri Aug <span class="nu0">21</span> <span class="nu0">15</span>:<span class="nu0">10</span>:<span class="nu0">11</span> CEST <span class="nu0">2026</span>
<span class="sy0">;;</span> MSG SIZE  rcvd: <span class="nu0">55</span>
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</pre></td><td class="de1"><pre class="de1">$ <span class="kw2">dig</span> +nocomments <span class="sy0">@</span>8.8.8.8 cweiske.de
 
; <span class="sy0"><<>></span> DiG 9.20.26-<span class="nu0">1</span>~deb13u1-Debian <span class="sy0"><<>></span> +nocomments <span class="sy0">@</span>8.8.8.8 cweiske.de
; <span class="br0">(</span><span class="nu0">1</span> server found<span class="br0">)</span>
<span class="sy0">;;</span> global options: +cmd
;cweiske.de.                    IN      A
cweiske.de.             <span class="nu0">3600</span>    IN      A       159.195.22.112
<span class="sy0">;;</span> Query time: <span class="nu0">23</span> msec
<span class="sy0">;;</span> SERVER: 8.8.8.8<span class="co0">#53(8.8.8.8) (UDP)</span>
<span class="sy0">;;</span> WHEN: Fri Aug <span class="nu0">21</span> <span class="nu0">15</span>:08:04 CEST <span class="nu0">2026</span>
<span class="sy0">;;</span> MSG SIZE  rcvd: <span class="nu0">65</span>
 
$ <span class="kw2">dig</span> +nocomments <span class="sy0">@</span>1.1.1.1 cweiske.de
 
; <span class="sy0"><<>></span> DiG 9.20.26-<span class="nu0">1</span>~deb13u1-Debian <span class="sy0"><<>></span> +nocomments <span class="sy0">@</span>1.1.1.1 cweiske.de
; <span class="br0">(</span><span class="nu0">1</span> server found<span class="br0">)</span>
<span class="sy0">;;</span> global options: +cmd
;cweiske.de.                    IN      A
cweiske.de.             <span class="nu0">3594</span>    IN      A       159.195.22.112
<span class="sy0">;;</span> Query time: <span class="nu0">3</span> msec
<span class="sy0">;;</span> SERVER: 1.1.1.1<span class="co0">#53(1.1.1.1) (UDP)</span>
<span class="sy0">;;</span> WHEN: Fri Aug <span class="nu0">21</span> <span class="nu0">15</span>:08:<span class="nu0">10</span> CEST <span class="nu0">2026</span>
<span class="sy0">;;</span> MSG SIZE  rcvd: <span class="nu0">65</span>
 
$ <span class="kw2">dig</span> +nocomments <span class="sy0">@</span>9.9.9.9 cweiske.de
 
; <span class="sy0"><<>></span> DiG 9.20.26-<span class="nu0">1</span>~deb13u1-Debian <span class="sy0"><<>></span> +nocomments <span class="sy0">@</span>9.9.9.9 cweiske.de
; <span class="br0">(</span><span class="nu0">1</span> server found<span class="br0">)</span>
<span class="sy0">;;</span> global options: +cmd
;cweiske.de.                    IN      A
cweiske.de.             <span class="nu0">3588</span>    IN      A       159.195.22.112
<span class="sy0">;;</span> Query time: <span class="nu0">3</span> msec
<span class="sy0">;;</span> SERVER: 9.9.9.9<span class="co0">#53(9.9.9.9) (UDP)</span>
<span class="sy0">;;</span> WHEN: Fri Aug <span class="nu0">21</span> <span class="nu0">15</span>:08:<span class="nu0">16</span> CEST <span class="nu0">2026</span>
<span class="sy0">;;</span> MSG SIZE  rcvd: <span class="nu0">65</span>
 </pre></td></tr></tbody></table></div>
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