The inside zone contains your trusted internal network. This includes employee workstations, internal servers, and private resources. Traffic originating from the inside zone typically has high trust.
Default policies usually:
- Permit inside-to-outside traffic (users accessing internet)
- Permit inside-to-DMZ traffic (users accessing internal web apps)
- Deny outside-to-inside traffic (block external threats)
You assign internal-facing firewall interfaces to this zone.