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<p class="MsoNormal"><span style="font-size:11.0pt">Thanks Greg. That is very helpful. Sorry I didn’t find that article on my own.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Bob<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Greg Choules <greg@isc.org>
<br>
<b>Sent:</b> Wednesday, October 16, 2024 10:10 AM<br>
<b>To:</b> Robert Mankowski <robert.mankowski@hotmail.com><br>
<b>Cc:</b> bind-users@lists.isc.org<br>
<b>Subject:</b> Re: DNSSEC, OpenDNS and www.cdc.gov<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Bob.<o:p></o:p></p>
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<p class="MsoNormal">See if this article helps any first, before we get into configs: <a href="https://kb.isc.org/docs/the-umbrella-feature-in-detail">https://kb.isc.org/docs/the-umbrella-feature-in-detail</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers, Greg<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal">On 16 Oct 2024, at 14:55, Robert Mankowski <<a href="mailto:robert.mankowski@hotmail.com">robert.mankowski@hotmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">I recently implemented a forward only BIND server for home. I was forwarding to OpenDNS FamilyShield using TLS and DNSSEC at first, but I was getting a noticeable amount of SERVFAIL responses. I believe it
is related to DNSSEC (see delv tests below), but I don’t believe it is my configuration because when I forward to Cloudflare’s Family service, or to Google DNS, I don’t have any problems with the same domains (e.g.<span class="apple-converted-space"> </span><a href="http://www.cdc.gov/"><span style="color:#467886">www.cdc.gov</span></a>).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">I contacted Cisco Umbrella support because I was thinking it’s an issue with their servers, but they didn’t really help, so I thought I would try this list for advice.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Would appreciate it if someone could review my configuration and/or reproduce my results to see if I’m doing something wrong.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Bob<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Here are some tests I ran:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">admin@router1:~$ apt-cache policy bind9<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">bind9:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> Installed: 1:9.21.1-1+0~20240920.124+debian12~1.gbp62e0e7<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> Candidate: 1:9.21.1-1+0~20240920.124+debian12~1.gbp62e0e7<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> Version table:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">*** 1:9.21.1-1+0~20240920.124+debian12~1.gbp62e0e7 500<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> 500<span class="apple-converted-space"> </span><a href="https://packages.sury.org/bind-dev"><span style="color:#467886">https://packages.sury.org/bind-dev</span></a><span class="apple-converted-space"> </span>bookworm/main
amd64 Packages<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> 100 /var/lib/dpkg/status<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> 1:9.18.28-1~deb12u2 500<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> 500<span class="apple-converted-space"> </span><a href="http://deb.debian.org/debian"><span style="color:#467886">http://deb.debian.org/debian</span></a><span class="apple-converted-space"> </span>bookworm/main
amd64 Packages<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> 500<span class="apple-converted-space"> </span><a href="http://security.debian.org/debian-security"><span style="color:#467886">http://security.debian.org/debian-security</span></a><span class="apple-converted-space"> </span>bookworm-security/main
amd64 Packages<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">admin@router1:~$ delv -v<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">delv 9.21.1-1+0~20240920.124+debian12~1.gbp62e0e7-Debian<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">admin@router1:~$ delv -4 @208.67.220.123<span class="apple-converted-space"> </span><a href="http://www.cdc.gov/"><span style="color:#467886">www.cdc.gov</span></a>. A<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">;; insecurity proof failed resolving '<a href="http://cdc.gov/DNSKEY/IN':"><span style="color:#467886">cdc.gov/DNSKEY/IN':</span></a><span class="apple-converted-space"> </span>208.67.220.123#53<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">;; broken trust chain resolving '<a href="http://www.cdc.gov/A/IN':"><span style="color:#467886">www.cdc.gov/A/IN':</span></a><span class="apple-converted-space"> </span>208.67.220.123#53<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">;; resolution failed: broken trust chain<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">admin@router1:~$ delv -4 @208.67.222.123<span class="apple-converted-space"> </span><a href="http://www.cdc.gov/"><span style="color:#467886">www.cdc.gov</span></a>. A<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">;; insecurity proof failed resolving '<a href="http://cdc.gov/DNSKEY/IN':"><span style="color:#467886">cdc.gov/DNSKEY/IN':</span></a><span class="apple-converted-space"> </span>208.67.222.123#53<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">;; broken trust chain resolving '<a href="http://www.cdc.gov/A/IN':"><span style="color:#467886">www.cdc.gov/A/IN':</span></a><span class="apple-converted-space"> </span>208.67.222.123#53<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">;; resolution failed: broken trust chain<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">admin@router1:~$ delv -4 @1.1.1.3<span class="apple-converted-space"> </span><a href="http://www.cdc.gov/"><span style="color:#467886">www.cdc.gov</span></a>. A<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">; fully validated<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><a href="http://www.cdc.gov/"><span style="color:#467886">www.cdc.gov</span></a>. 248 IN CNAME <span class="apple-converted-space"> </span><a href="http://www.akam.cdc.gov/"><span style="color:#467886">www.akam.cdc.gov</span></a>.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><a href="http://www.cdc.gov/"><span style="color:#467886">www.cdc.gov</span></a>. 248 IN RRSIG CNAME 8 3 300 20241019153420 20241009150230 1503<span class="apple-converted-space"> </span><a href="http://cdc.gov/"><span style="color:#467886">cdc.gov</span></a>.
b99UIGmCOTJj+C7JFXORmtUXQEIIGdF0q3Z5u6HfAbKcJhjfFjJrkRE6 yntzr0pSksCp1Uwi146xvKz7ImCqkYK67/WlOujyquOGSfgOwO1DvUyj TfvXJWvjSRLTx30lwU6RV80RrC596A16anTpLc7Zi4VEAVncRHeUl1y1 /MG/CSCtE/Ef6tPD1FtGZjhXszVAgrk3fhISCsImRHuGAoIBnIKCKx2M YMhxirfV0z9Qq46PnW9zTzh+EbVKZkN0C+Xl3j2+4sqyHlubhrtgklG/
g0u+99/g/jdfex+Vh7dtcAXFcTZ1XGuPQXgsn6GrznecB8PaXmCxXfft GaDOdQ==<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><a href="http://www.akam.cdc.gov/"><span style="color:#467886">www.akam.cdc.gov</span></a>. 20 IN A 23.51.224.222<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><a href="http://www.akam.cdc.gov/"><span style="color:#467886">www.akam.cdc.gov</span></a>. 20 IN RRSIG A 10 4 20 20241018102927 20241015092927 16701<span class="apple-converted-space"> </span><a href="http://akam.cdc.gov/"><span style="color:#467886">akam.cdc.gov</span></a>.
Lcd7WthqqU+A7UwQkBHZsT0nqxztJkn9cx57wXr4eHHCvJR0cCxZFkwl eIbSffPIu364terXJlcEvuWbWTLrCX7bo0c6B9bA5EPi2DsbegTfkG5u cqrZP9RTzXbfbs5l5w6CQ9DfSPcYx9BIYkusErQu5qQnGhoQ5bXI1VxT Otc=<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">The relevant portion of my named configuration is:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">tls opendns-tls {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> remote-hostname "<a href="http://dns.opendns.com/"><span style="color:#467886">dns.opendns.com</span></a>";<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">};<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">tls cloudflare_family-tls {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> remote-hostname "one.one.one.one";<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">};<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">tls google-tls {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">};<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">tls router1-tls {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> key-file "/var/cache/bind/privkey.pem";<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> cert-file "/var/cache/bind/fullchain.pem";<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> dhparam-file "/var/cache/bind/dhparam.pem";<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> ciphers "HIGH:!kRSA:!aNULL:!eNULL:!RC4:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS:!SHA1:!SHA256:!SHA384";<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> prefer-server-ciphers yes;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> session-tickets no;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">};<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">options {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> directory "/var/cache/bind";<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> recursion yes;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> allow-query { trusted_nets; };<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> version "none";<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> forwarders {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"># 1.1.1.3 port 853 tls cloudflare_family-tls;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"># 1.0.0.3 port 853 tls cloudflare_family-tls;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> 208.67.222.123 port 853 tls opendns-tls;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> 208.67.220.123 port 853 tls opendns-tls;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"># 8.8.8.8 port 853 tls google-tls;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"># 8.8.4.4 port 853 tls google-tls;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> };<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> forward only;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> allow-transfer { none; };<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> dnssec-validation auto;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> listen-on port 443 tls router1-tls http default { trusted_interfaces; };<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> listen-on port 853 tls router1-tls { trusted_interfaces; };<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> listen-on { trusted_interfaces; };<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> listen-on-v6 { none; };<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> zone-statistics yes ;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">};<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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