In OpenStack Neutron, Firewall provides security by configuring the access control at the Network Router, in contrast to the security group, which provided the access control at the Network port. The Firewall policies provide you with the access control over the traffic crossing the Network boundary.
In Neutron, a Firewall service is composed of a Firewall policy, which in turn is composed of many Firewall rules. We will start exploring Firewall as a service by first looking at the Firewall rules. We will then create a Firewall policy by grouping these rules. Finally, we will define a Firewall that will use the Firewall policy that we created.
In this recipe, we will go through the process of creating a Firewall rule using Horizon. For this recipe, you will need the following information:
The Firewall rule name
The rule description
The protocol to define the type of traffic, for example, TCP, UDP, or ICMP
The type of action that the rule will add, for example...