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tech_notes:dns [2024-05-18 Sat wk20 18:52] – [Public DNS providers] baumkptech_notes:dns [2024-06-16 Sun wk24 10:20] (current) – [DNS Performance Checker] baumkp
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     - LAN based     - LAN based
       - This can act as a local caching DNS server and also be used for LAN        - This can act as a local caching DNS server and also be used for LAN 
-  - ISP resolver+  - public resolver
   - authoritative domain resolver   - authoritative domain resolver
  
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       - 2620:fe::fe       - 2620:fe::fe
       - 2620:fe::9       - 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   -  [[https://www.opendns.com/|OpenDNS]], belongs to Cisco
-    - IPv4 (filtered)+    - IPv4 
 +      - 208.67.222.222 
 +      - 208.67.220.220 
 +    - IPv4 (filtered family shield, not-configurable)
       - 208.67.222.123       - 208.67.222.123
       - 208.67.220.123       - 208.67.220.123
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       - 2620:4700:4700::1001       - 2620:4700:4700::1001
     -  See [[https://one.one.one.one/family/|one.one.one.one/family]] for filtered options     -  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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