zone-policy: page information is added

zone-policy page was blank, added the definition and the configuration
example.

1 files changed, 64 insertions, 1 deletions

diff --git a/docs/configuration/zonepolicy/index.rst b/docs/configuration/zonepolicy/index.rst
index 31784dc3..8fe18778 100644
--- a/docs/configuration/zonepolicy/index.rst
+++ b/docs/configuration/zonepolicy/index.rst
@@ -1,3 +1,4 @@
+
 ###########
 Zone Policy
 ###########
@@ -5,4 +6,66 @@ Zone Policy
 
 .. toctree::
    :maxdepth: 1
-   :includehidden:
\ No newline at end of file
+   :includehidden:
+
+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.
+
+Key Points:
+
+* 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.
+
+Example: LAN Network is given SSH access to VyOS box.
+
+Firewall rules:
+
+.. code-block:: none
+
+  set firewall name lan-local default-action 'drop'
+  set firewall name lan-local rule 1 action 'accept'
+  set firewall name lan-local rule 1 state established 'enable'
+  set firewall name lan-local rule 1 state related 'enable'
+  set firewall name lan-local rule 2 action 'drop'
+  set firewall name lan-local rule 2 state invalid 'enable'
+  set firewall name lan-local rule 2 log enable
+  set firewall name lan-local rule 100 action 'accept'
+  set firewall name lan-local rule 100 destination port '22'
+  set firewall name lan-local rule 100 log 'enable'
+  set firewall name lan-local rule 100 protocol 'tcp'
+  set firewall name local-lan default-action 'drop'
+  set firewall name local-lan rule 1 action 'accept'
+  set firewall name local-lan rule 1 state established 'enable'
+  set firewall name local-lan rule 1 state related 'enable'
+  set firewall name local-lan rule 2 action 'drop'
+  set firewall name local-lan rule 2 state invalid 'enable'
+  set firewall name local-lan rule 2 log enable
+  set firewall name local-lan rule 100 action 'accept'
+  set firewall name local-lan rule 100 destination address '192.168.0.0/24'
+  set firewall name local-lan rule 100 log 'enable'
+  set firewall name local-lan rule 100 protocol 'tcp'
+  
+Zone-policy Config: 
+
+.. code-block:: none
+ 
+  set zone-policy zone lan default-action 'drop'
+  set zone-policy zone lan description 'Local Area Network'
+  set zone-policy zone lan interface 'eth2'
+  set zone-policy zone lan from local firewall name 'lan-local'
+  set zone-policy zone local default-action 'drop'
+  set zone-policy zone local description 'system-defined zone'
+  set zone-policy zone local from lan firewall name 'local-lan'
+  set zone-policy zone local local-zone
+
+A detailed zone-based policy example is written in the Configuration-Blueprints_ section.
+
+.. stop_vyoslinter
+
+.. _Configuration-Blueprints: https://docs.vyos.io/en/latest/configexamples/zone-policy.html
+
+.. start_vyoslinter