Zone Based Firewall
In zone-based policy, interfaces are assigned to zones, and inspection policy is applied to traffic moving between the zones and acted on according to firewall rules. A Zone is a group of interfaces that have similar functions or features. It establishes the security borders of a network. A zone defines a boundary where traffic is subjected to policy restrictions as it crosses to another region of a network.
A zone must be configured before an interface is assigned to it and an interface can be assigned to only a single zone.
All traffic to and from an interface within a zone is permitted.
All traffic between zones is affected by existing policies
Traffic cannot flow between zone member interface and any interface that is not a zone member.
You need 2 separate firewalls to define traffic: one for each direction.
In T2199 the syntax of the zone configuration was changed.
The zone configuration moved from
zone-policy zone <name> to
As an alternative to applying policy to an interface directly, a zone-based firewall can be created to simplify configuration when multiple interfaces belong to the same security zone. Instead of applying rule-sets to interfaces, they are applied to source zone-destination zone pairs.
An basic introduction to zone-based firewalls can be found here, and an example at Zone-Policy example.
Define a Zone
To define a zone setup either one with interfaces or a local zone.
Set interfaces to a zone. A zone can have multiple interfaces. But an interface can only be a member in one zone.
Define the zone as a local zone. A local zone has no interfaces and will be applied to the router itself.
Change the default-action with this setting.
Applying a Rule-Set to a Zone
Before you are able to apply a rule-set to a zone you have to create the zones first.
It helps to think of the syntax as: (see below). The ‘rule-set’ should be written from the perspective of: Source Zone-to->*Destination Zone*
You apply a rule-set always to a zone from an other zone, it is recommended to create one rule-set for each zone pair.
set firewall zone DMZ from LAN firewall name LANv4-to-DMZv4 set firewall zone LAN from DMZ firewall name DMZv4-to-LANv4