Rules and Policies
Allow and deny traffic.
What Is a Firewall Rule
A firewall rule tells the firewall what to do with traffic that matches certain conditions.
Each rule has a match (such as source, destination, port) and an action (allow or deny).
Rule: allow tcp from any to 10.0.0.5 port 443
Meaning: permit HTTPS traffic to the web server.Allow and Deny
The two core actions are allow (permit the traffic) and deny (block it).
Some firewalls distinguish drop (silently discard) from reject (block and notify the sender).
All lessons in this course
- Firewall Types
- Rules and Policies
- Network Segmentation
- DMZ Design