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caching_only_dns

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caching_only_dns [2018-02-28 20:47:53] – angelegt manfredcaching_only_dns [2025-08-21 11:50:43] (aktuell) – [Installation auf Ubuntu 24.04] manfred
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 +====== Caching only DNS ======
 +
 +  * [[https://www.digitalocean.com/community/tutorials/how-to-configure-bind-as-a-caching-or-forwarding-dns-server-on-ubuntu-14-04]]
 +  * [[https://aacable.wordpress.com/2011/07/04/setup-a-forwarding-caching-only-dns-server-on-ubuntu/]]
 +
 +
 +===== Installation auf Ubuntu 24.04 =====
 +
 +<code bash 1. Prüfen ob systemd-resolved bereits aktiv ist:>
 +systemctl status systemd-resolved
 +</code>
 +
 +<code bash 2. Konfiguration anpassen:>
 +sudo vim /etc/systemd/resolved.conf
 +</code>
 +
 +<code bash 3. Diese Einstellungen aktivieren:>
 +[Resolve]
 +DNS=8.8.8.8 1.1.1.1
 +Cache=yes
 +DNSStubListener=yes
 +</code>
 +
 +<code bash 4. Service neu starten:>
 +sudo systemctl restart systemd-resolved
 +sudo systemctl enable systemd-resolved
 +</code>
 +
 +<code bash 5. DNS-Konfiguration aktualisieren:>
 +sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
 +</code>
 +
 +
 +===== Installation auf Ubuntu 16.04 =====
 +
 +  > apt install bind9 bind9utils
 +
 +<file c /etc/default/bind9>
 +# run resolvconf?
 +RESOLVCONF=no
 +
 +# startup options for the server
 +OPTIONS="-4 -u bind"
 +</file>
 +
 +<file c /etc/bind/named.conf.options>
 +//
 +// Caching only DNS Server
 +// https://fxdata.cloud/tutorials/configure-bind-as-a-caching-or-forwarding-dns-server-on-ubuntu-14-04
 +//
 +//acl goodclients {
 +//      10.10.0.9;
 +//      127.0.1.1;
 +//      127.0.0.1;
 +//      localhost;
 +//      localnets;
 +//};
 +
 +acl goodclient {
 +    localhost;
 +    localnets;
 +};
 +
 +options {
 +        directory "/var/cache/bind";
 +
 +        // If there is a firewall between you and nameservers you want
 +        // to talk to, you may need to fix the firewall to allow multiple
 +        // ports to talk.  See http://www.kb.cert.org/vuls/id/800113
 +        // If your ISP provided one or more IP addresses for stable
 +        // nameservers, you probably want to use them as forwarders.
 +        // Uncomment the following block, and insert the addresses replacing
 +        // the all-0's placeholder.
 +
 +        // forwarders {
 +        //      0.0.0.0;
 +        // };
 +
 +        recursion yes;
 +
 +//      allow-query {
 +//              goodclients;
 +//      };
 +
 +        forwarders {
 +                8.8.8.8;    // Google DNS 1
 +                4.4.4.4;    // Google DNS 2
 +                1.1.1.1;    // popular DNS
 +        };
 +
 +        forward only;
 +
 +        //========================================================================
 +        // If BIND logs error messages about the root key being expired,
 +        // you will need to update your keys.  See https://www.isc.org/bind-keys
 +        //========================================================================
 +        //dnssec-validation auto;
 +
 +        dnssec-enable yes;
 +        dnssec-validation yes;
 +
 +        auth-nxdomain no;    # conform to RFC1035
 +        //listen-on-v6 { any; };
 +        listen-on-v6 { none; };
 +
 +        #----------------------------------------------------------------------#
 +
 +        query-source address * port 53;
 +
 +        listen-on {
 +                127/8;
 +        };
 +
 +        allow-query { goodclient; };
 +};
 +</file>
 +
 +  > service bind9 restart
 +
 +
 +===== Installation auf Ubuntu 14.04 =====
 +
 +  > apt install bind9 bind9utils
 +
 +<file c /etc/default/bind9>
 +# run resolvconf?
 +RESOLVCONF=no
 +
 +# startup options for the server
 +OPTIONS="-4 -u bind"
 +</file>
 +
 +<file c /etc/bind/named.conf.options>
 +//
 +// Caching only DNS Server
 +// https://fxdata.cloud/tutorials/configure-bind-as-a-caching-or-forwarding-dns-server-on-ubuntu-14-04
 +//
 +//acl goodclients {
 +//      10.10.0.9;
 +//      127.0.1.1;
 +//      127.0.0.1;
 +//      localhost;
 +//      localnets;
 +//};
 +
 +options {
 +        directory "/var/cache/bind";
 +
 +        // If there is a firewall between you and nameservers you want
 +        // to talk to, you may need to fix the firewall to allow multiple
 +        // ports to talk.  See http://www.kb.cert.org/vuls/id/800113
 +        // If your ISP provided one or more IP addresses for stable
 +        // nameservers, you probably want to use them as forwarders.
 +        // Uncomment the following block, and insert the addresses replacing
 +        // the all-0's placeholder.
 +
 +        // forwarders {
 +        //      0.0.0.0;
 +        // };
 +
 +        recursion yes;
 +
 +//      allow-query {
 +//              goodclients;
 +//      };
 +
 +        forwarders {
 +                8.8.8.8;
 +        };
 +
 +        //forward only;
 +
 +        //========================================================================
 +        // If BIND logs error messages about the root key being expired,
 +        // you will need to update your keys.  See https://www.isc.org/bind-keys
 +        //========================================================================
 +        //dnssec-validation auto;
 +
 +        dnssec-enable yes;
 +        dnssec-validation yes;
 +
 +        auth-nxdomain no;    # conform to RFC1035
 +        //listen-on-v6 { any; };
 +        listen-on-v6 { none; };
 +
 +        #----------------------------------------------------------------------#
 +
 +        query-source address * port 53;
 +
 +        listen-on {
 +                127/8;
 +        };
 +};
 +</file>
 +
 +  > service bind9 restart