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--- tech_notes:dns [2024-05-18 Sat wk20 18:30] – baumkp
+++ tech_notes:dns [2024-06-16 Sun wk24 10:20] (current) – [DNS Performance Checker] baumkp
@@ Line 32: / Line 32: @@
     - LAN based
       - This can act as a local caching DNS server and also be used for LAN
-  - ISP resolver
+  - public resolver
   - authoritative domain resolver
 =====Public DNS providers=====
-  - [[https://www.quad9.net/|Quad9]]
+  - [[https://www.quad9.net/|Quad9]], free no commercial foundation
-    - IPv4
+    - IPv4 (filtered)
       -  9.9.9.9
       - 149.112.112.112
-    - IPv6
+    - IPv6 (filtered)
       - 2620:fe::fe
       - 2620:fe::9
+    - [[https://www.quad9.net/service/service-addresses-and-features|Quad9 Service Addresses & Features]] some other options
+  -  [[https://www.opendns.com/|OpenDNS]], belongs to Cisco
+    - IPv4
+      - 208.67.222.222
+      - 208.67.220.220
+    - IPv4 (filtered family shield, not-configurable)
+      - 208.67.222.123
+      - 208.67.220.123
+    - IPv6 (filtered)
+      - 2620:119:35::35
+      - 2620:119:53::53
+    - IPv6 (unfiltered)
+      - 2620:0:ccc::2
+      - 2620:0:ccd::2
+  - [[https://one.one.one.one/dns/|one.one.one.one]] (Cloudflare)
+    - IPv4 (unfiltered)
+      - 1.1.1.1
+      - 1.0.0.1
+    - IPv6 (unfiltered)
+      - 2620:4700:4700::1111
+      - 2620:4700:4700::1001
+    -  See [[https://one.one.one.one/family/|one.one.one.one/family]] for filtered options
+=====Linux DNS Setup=====
+The local OS DNS servers are specified in ''/etc/resolv.conf''
+The bind9 file that configs the DNS forwarders is ''/etc/bind/name.conf.options'', the DNS ''forwarders'' are configured.
+The kea dhcp configuration has the following related to DNS and gateway setup.
+++++dhcpv4.conf|
+<code yaml>  "subnet4": [
+    {
+      "subnet": "192.168.1.0/24",
+      // There are no relays in this network, so we need to tell Kea that this subnet
+      // is reachable directly via the specified interface.
+      "interface": "enp1s0",
+     "pools": [
+        {
+          "pool": "192.168.1.100 - 192.168.1.200"
+        }
+      ],
+    "option-data": [
+      {
+        "name": "routers",
+        "data": "192.168.1.1"
+      },
+      {
+        "name": "domain-name-servers",
+        "data": "192.168.1.14,192.168.1.2,9.9.9.9"
+      }
+    ],</code>
+++++
+=====DNS Performance Checker=====
+A good resource for checking DNS performance is from [[https://www.grc.com|GRC Gibson reserch Corporation (Steve Gibson)]].  The speed checker bench marking program [[https://www.grc.com/dns/benchmark.htm|GRC DNS Bench marker]] is only Windows based.  It reportedly runs in Linux/WINE.
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