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--- ubuntu:networking:dns:configure_dns_cache [2021/01/13 10:23] – created peter
+++ ubuntu:networking:dns:configure_dns_cache [2021/01/13 11:41] (current) – peter
@@ Line 28: / Line 28: @@
 #ReadEtcHosts=yes
 </file>
+<WRAP info>
+**NOTE:**  Options are:
+**__Cache__**:
+  * **yes**:  The default.  Resolving a domain name which already got queried earlier will return the previous result as long as it is still valid, and thus does not result in a new network request.
+  * **no**:  Be aware that turning off caching comes at a performance penalty, which is particularly high when DNSSEC is used.
+  * **no-negative**:  Only positive answers are cached.
+**__CacheFromLocalhost__**:
+    * **no**:  The default.  Caching is turned off by default for host-local DNS servers.
+      * If a response comes from host-local IP address (such as 127.0.0.1 or ::1), the result wouldn't be cached in order to avoid potential duplicate local caching.
+    * **yes**:  Cache host-local DNS as well.
+</WRAP>
+----