Most of the ISP provide customer with a dynamic IP addresses. So, is it possible to access my Sonicwall Firewall (with dynamic public IP) from public network?

The answer is yes. You can use Dynamic DNS to achieve it.

What is Dynamic DNS?

By refer to wikipedia, Dynamic DNS (DDNS or DynDNS) is a method of automatically updating a name server in the Domain Name System (DNS), often in real time, with the active DDNS configuration of its configured hostnames, addresses or other information.

Currently, SonicOS supports three DDNS providers, dyn.com , changeip.com and NO-IP. com.

In my setup, i will use NO-IP.com as my Dynamic DNS. The reason that i choose NO-IP.com is because it is free.

There are 2 task i need to do.

First is register account at NO-IP.com and add host in NO-IP.com account.

Second task is configure DDNS on Sonicwall Firewall. Below are steps

1. Login to the SonicWall management GUI
2. Navigate to Network | Dynamic DNS
3. Click on Add
4. Add DDNS Profile windows will pop up
5. Configure the profile by select the DDNS Provider, DDNS account login (username and password) and Domain Name. In Bound to section, please select the interface to which the IP is bounded.  Once done, click OK to apply the setting.

Once you connected, you will see DDNS status show On-line with ISP public IP.