Add UFW cheatsheet

ufw.md

@@ -0,0 +1,73 @@
+# UFW Firewall
+
+## General
+
+### Status (List all current rules)
+
+```
+sudo ufw status verbose
+```
+
+### Enable
+
+```
+sudo ufw enable
+```
+
+### Disable
+
+```
+sudo ufw disable
+```
+
+### Reset UFW rules
+
+```
+sudo ufw reset
+```
+
+## Block
+
+### IP-address
+
+```
+sudo ufw deny from 15.15.15.51
+```
+
+### Deny outgoing from port
+
+```
+sudo ufw deny out 25
+```
+
+### Deny to Network interface
+
+```
+sudo ufw deny in on eth0 from 15.15.15.51
+```
+
+## Allow
+
+### IP-address
+
+```
+sudo ufw allow from 15.15.15.15
+```
+
+### Subnet to specific port
+
+```
+sudo ufw allow from 15.15.15.0/24  to any port 22
+```
+
+### Service
+
+```
+sudo ufw allow https
+```
+
+### Port
+
+```
+sudo ufw allow 25
+```