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+====== NSD dns server ======
+https://calomel.org/nsd_dns.html
+NSD is lightweight and faster and simpler to configure than [[soft:bind|bind]]. It doesn't support dynamic dns update, so in my case I use it as a secondary dns server:
+<code>
+apt-get install nsd
+</code>
+Here's a config for a secondary dns receiving notify and issuing AXFR transfer using a hmac-sha512 key (symetric  secret key shared with the primary server).
+<file /etc/nsd/nsd.conf>
+server:
+    ip-address: 0.0.0.0
+    ip-address: ::
+    port: 53
+    server-count: 1
+    ip4-only: yes
+    hide-version: yes
+    identity: ""
+    zonesdir: "/etc/nsd"
+    verbosity: 3
+key:
+   name: "schwarz.in.philpep.org."
+   algorithm: hmac-sha512
+   secret: "XXX XXX=="
+zone:
+    name: philpep.org
+    zonefile: philpep.org
+    allow-notify: 192.168.62.2 schwarz.in.philpep.org.
+    request-xfr: AXFR 192.168.62.2@53 schwarz.in.philpep.org.
+</file>

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