~~NOTOC~~
====== Anycast DNS ======

===== Description of service =====

This service provides an efficient and fault tolerant way of resolving ''168.192.in-addr.arpa'' and ''0.b.3.f.4.6.b.6.0.0.d.f.ip6.arpa'' zones across GLaNET.

  * To use it, simply add forwarding zones, pointing to the following servers:

<note important>
  * Anycast DNS IPv4: **192.168.248.53**.
  * Anycast DNS IPv6: **''fd00:6b64:f3b0::53''**.
</note>

<note tip>**BIND9 configuration example (forwarder)**
<code>
zone "168.192.in-addr.arpa" {
  type forward;
  forwarders { 192.168.248.53; fd00:6b64:f3b0::53; };
};

zone "0.b.3.f.4.6.b.6.0.0.d.f.ip6.arpa" {
  type forward;
  forwarders { 192.168.248.53; fd00:6b64:f3b0::53; };
};
</code></note>

<note tip>**Unbound configuration example (forwarder)**
<code>
server:
(...)
    local-zone:         "168.192.in-addr.arpa." nodefault
    local-zone:         "0.b.3.f.4.6.b.6.0.0.d.f.ip6.arpa." transparent

    domain-insecure:    "0.b.3.f.4.6.b.6.0.0.d.f.ip6.arpa."
(...)

stub-zone:
  name:         168.192.in-addr.arpa.
  stub-addr:    fd00:6b64:f3b0::53
  stub-addr:    192.168.248.53

stub-zone:
  name:         0.b.3.f.4.6.b.6.0.0.d.f.ip6.arpa.
  stub-addr:    fd00:6b64:f3b0::53
  stub-addr:    192.168.248.53

</code></note>

<note tip>**Knot Resolver configuration example (forwarder)**
<code>
(...)
-- Forward all requests for 168.192.in-addr.arpa. to fd00:6b64:f3b0::53 and 192.168.248.53
policy.add(policy.suffix(policy.STUB({'fd00:6b64:f3b0::53', '192.168.248.53'}), {todname('168.192.in-addr.arpa')}))

-- Forward all requests for 0.b.3.f.4.6.b.6.0.0.d.f.ip6.arpa to fd00:6b64:f3b0::53 and 192.168.248.53
policy.add(policy.suffix(policy.STUB({'fd00:6b64:f3b0::53', '192.168.248.53'}), {todname('0.b.3.f.4.6.b.6.0.0.d.f.ip6.arpa')}))
(...)
</code></note>
===== Recursive DNS =====

We also aim to provide a recursive anycast DNS service within GLaNET. To use it, just configure the following addresses as your resolver:

<note important>
  * Anycast recursive DNS IPv4: **192.168.248.153**.
  * Anycast recursive DNS IPv6: **''fd00:6b64:f3b0::153''**.
</note>