Update README.md

README.md

@@ -1,5 +1,41 @@
 # Dynamic DNS in Firewall
 
-Allow traffic from a Dynamic DNS Domain with a Dynamic IP Address
+Automatically set traffic rules from a Dynamic DNS Domain with Dynamic IP Addresses
+
+> Currently only works with `UFW`, but could be easily adapted to `IPTABLES`. Feel free to contribute!
+
+## How it works
+
+Allows traffic from IPv4 and optionally IPv6 addesses for a given domain. 
+
+```
+$ ufw status
+22                        ALLOW IN    1111:1:1::1          # SSH from Dynamic IP (one.dynamic.dns.domain.tld)
+22                        ALLOW IN    2.2.2.2              # SSH from Dynamic IP (two.dynamic.dns.domain.tld)
+22                        ALLOW IN    2222:2:2::2          # SSH from Dynamic IP (two.dynamic.dns.domain.tld)
+```
+
+Multiple addresses supported per domain!
+
+As well as domains supported! Add as many Dynamic DNS domains as you want!
+
+Firewall rules for addresses no longer in the DNS records are removed.
+
+## Required packages
+- ufw
+- dig
+- grep
+- awk
+
+## "Install"/Schedule Cron 
+
+1. Download the latest release
+2. Copy to your desired location—for this example we will use `/var/cron`
+3. Run it to make sure it works without any errors `bash /var/cron/dynamic-dns-in-ufw.sh`
+4. Then enter crontab `$ sudo vim /etc/crontab`
+5. To the end of the line add one of the following:
+  - To run every hour add `0  *  *  *  *   root    /var/cron/dynamic-dns-in-ufw.sh`
+  - Or for every half hour add `*/30  *  *  *  *   root    /var/cron/dynamic-dns-in-ufw.sh`
+6. Save and exit vim `:wq`
+
 
-Currently only works with UFW, but could be easily adapted to IPTABLES. Feel free to contribute!