ongoing additions, changes, and fixes

Linux-and-BSD-firewalls-cheat-sheet.adoc

@@ -36,3 +36,33 @@ v1.0, 2020-09-01
 
 
 |===
+
+
+== Ubuntu Uncomplicated Firewall (ufw)
+.ufw management commands
+[cols=2, options="header"]
+|===
+|Command
+|Description
+
+|*ufw status*
+|Show whether the firewall is on and if on, list the active rules.
+
+|*ufw enable*
+|Enable firewall.
+
+|*ufw disable*
+|Disable firewall
+
+|*ufw reload*
+|Reload firewall and rules.
+
+|*ufw allow <predefined service name>*
+| Allow some service in aany direction from/to any IP address using so called `simple` rule syntax. The service names are as per `/etc/services`. E.g. to allow ssh from any: `ufw allow ssh`.
+
+|*/etc/ufw/before.rule*
+|Some rules are pre-allowed by default, to change them edit the above file and reload firewall.
+
+|===
+
+