The Cloud IBR Firewall is an Ubuntu based firewall running UFW to manage inbound access rules from the Internet and IPTABLES /etc/ufw/before.rules to manage NAT mappings.
If you’d like to customize your firewall rules during a Manual Shutdown recovery test or during an actual Disaster, please refer to the following Ubuntu documentation.
There are also countless websites publicly available with examples of how to accomplish most any goal you might be looking to accomplish with UFW and IPTABLES.