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</o:shapelayout></xml><![endif]--></head><body lang=NL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'>For FireFox you can also set a Canary Domain : <a href="https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet">https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet</a> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'>That is what we also do to Redirect DNS request to the router (I am a DDWRT developer)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'>Erik<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b>Van:</b> Eric Fahlgren <ericfahlgren@gmail.com> <br><b>Verzonden:</b> zondag 18 december 2022 19:44<br><b>Aan:</b> Michael Smith <michael@kmaclub.com><br><b>CC:</b> Jonathan Stafford <thecabinet@gmail.com>; dnsmasq-discuss@lists.thekelleys.org.uk<br><b>Onderwerp:</b> Re: [Dnsmasq-discuss] Change upstream server by client?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>Well, the real issue is DNS "leakage", because some (most?) browsers and lots of phone apps use their own resolvers, thus bypassing your advertised DNS resolver. My solution is on the router: I set up dnsmasq as my local resolver (with adblock and DNSSEC, stubby is my backend for DoT), don't even bother advertising it and then have three sets of firewall rules to make sure all hosts adhere to the One True DNS:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>1) DNS redirect: All LAN device requests to WAN (or LAN) at port 53 are redirected to the router:53.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>2) DoT block: All LAN devices attempting to access port 853 anywhere are blocked.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>3) DoH block: All LAN devices that attempt to access port 443 on WAN are checked against a couple of sets of host IP addresses (one each for IPv4 and v6), and if the external host is a known-DoH resolver, the request is blocked. (I update nightly from <a href="https://github.com/dibdot/DoH-IP-blocklists">https://github.com/dibdot/DoH-IP-blocklists</a>)<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>When setting this up, I would watch tcpdump for various requests and convinced myself that I was catching 99% of everything, but I have not even tried to figure out DNS-over-QUIC and how it might be getting past my rules.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>#1 means that if I go to any machine in the house and say 'nslookup <a href="http://blarg.com">blarg.com</a> 8.8.8.8' or 'dig @<a href="http://8.8.8.8">8.8.8.8</a> <a href="http://blarg.com">blarg.com</a>', then I see my router as the DNS resolver in the response, even though I explicitly asked for 8.8.8.8 to resolve it. Which in turn means that DNS configuration on a per-machine is not required, and anyone connecting to my network is subject to my rules.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'>#3 causes some browsers to hang because they really, really want to use DoH. Usually there is a browser setting to disable DoH, so it resorts to plain DNS (at least there is in Firefox, which is what I make everyone here use; yeah, I'm dictator :) ).<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div></div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sun, Dec 18, 2022 at 9:57 AM Michael Smith <<a href="mailto:michael@kmaclub.com">michael@kmaclub.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal>I am not aware of a way, but hopefully someone else has ideas. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I run two instances of pihole. One for the grown ups that points upstream to 1.1.1.1 and the other points to 1.1.1.3. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Then I use similar stanzas below to point the clients to the right pihole<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Michael <o:p></o:p></p></div><div><p class=MsoNormal><br><br><o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal style='margin-bottom:12.0pt'>On Dec 18, 2022, at 9:10 AM, Jonathan Stafford <<a href="mailto:thecabinet@gmail.com" target="_blank">thecabinet@gmail.com</a>> wrote:<o:p></o:p></p></blockquote></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal><o:p></o:p></p><div><p class=MsoNormal>Thanks, Michael. That will work to get them using that server, but it's totally bypassing dnsmasq which means my local entries from /etc/hosts don't resolve. I'd like both things to work to be difficult :)<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sun, Dec 18, 2022 at 10:36 AM Michael Smith <<a href="mailto:michael@kmaclub.com" target="_blank">michael@kmaclub.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal>On 12/18/22 06:59, Jonathan Stafford wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>--server provides a way to change upstream resolvers based on the domain being queried. Is there a way to make the same sort of change based on the client doing the querying? For example, I'd like the IP address range I use for my kids' devices to use 1.1.1.3. <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div></div></blockquote><p><o:p> </o:p></p><p>You can achieve this using tags:<o:p></o:p></p><p><o:p> </o:p></p><p><o:p> </o:p></p><p><span style='font-family:"Courier New";color:black;background:white'># Define DNS servers </span><span style='font-family:"Courier New"'><br>dhcp-option=option:dns-server,1.1.1.1<br><span style='color:black;background:white'>dhcp-option=tag:kidsdevices,option:dns-server,1.1.1.3</span></span><o:p></o:p></p><p><o:p> </o:p></p><p><span style='font-family:"Courier New";color:black;background:white'>dhcp-host=0c:51:01:95:d3:36,set:kidsdevices # Ipad </span><span style='font-family:"Courier New"'><br>dhcp-host=58:41:4E:CD:D2:0A,set:kidsdevices # Iphone</span><o:p></o:p></p><p><o:p> </o:p></p><p><span style='font-family:"Courier New"'>Michael</span><o:p></o:p></p><p><o:p> </o:p></p></div><p class=MsoNormal>_______________________________________________<br>Dnsmasq-discuss mailing list<br><a href="mailto:Dnsmasq-discuss@lists.thekelleys.org.uk" target="_blank">Dnsmasq-discuss@lists.thekelleys.org.uk</a><br><a href="https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss" target="_blank">https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss</a><o:p></o:p></p></blockquote></div></div></blockquote></div><p class=MsoNormal>_______________________________________________<br>Dnsmasq-discuss mailing list<br><a href="mailto:Dnsmasq-discuss@lists.thekelleys.org.uk" target="_blank">Dnsmasq-discuss@lists.thekelleys.org.uk</a><br><a href="https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss" target="_blank">https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss</a><o:p></o:p></p></blockquote></div></div></body></html>