Created 4.2.3 uMatrix (markdown)

4.2.3-uMatrix.md

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+
+**Prevent Internet sites from requesting LAN resources** ( thanks @theWalkingDuck )
+
+this is/was the only default ABE rule in Noscript:
+```
+# Noscript
+# Prevent Internet sites from requesting LAN resources.
+
+Site LOCAL
+Accept from LOCAL
+Deny
+```
+
+We can easily rewrite it in the uMatrix way:
+```
+[Source]              * -> any external resource 
+[Destination] 127.0.0.1 -> which tries to access the localhost or local resources
+[Content]             * -> whatever the request or the requested content is ..
+[action]          block -> should be BLOCKED
+```
+
+```
+# uMatrix
+# Prevent Internet sites from requesting LAN resources.
+
+* 127.0.0.1 * block
+* localhost * block
+* [::1]     * block       ### block access to ipv6 localhost
+* 192.168   * block       ### block access to LAN 192.168.x.x
+```
+
+The best practice is to use a separate browser for accessing local resources or using a temporary allow if needed ... but for those who need it permanently:
+```
+# uMatrix
+# Accept from LOCAL
+
+127.0.0.1 127.0.0.1 * allow
+localhost localhost * allow
+[::1]     [::1]     * allow
+192.168   192.168   * allow
+```
+btw, don't forget to remove the `matrix-off: localhost true` rule.
+
+---