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Zones
You can configure zones in the network and define policies to control how traffic enters and leaves zones. By default, the following zones are created:
- Internet_Zone
- Applies to traffic to or from an Internet service using a Trusted interface.
-
Untrusted_Internet_Zone
- Applies to traffic to or from an Internet service using an Untrusted interface.
-
Default_LAN_Zone
- Applies to traffic to or from an object with a configurable zone, where the zone has not been set.
You can create your own zones and assign them to the following types of objects:
-
Virtual Network Interfaces (VNI)
-
Intranet Services
-
GRE Tunnels
-
LAN IPsec Tunnels
The destination zone of a packet is determined based on the destination route match. When a SD-WAN appliance looks up the destination subnet in the route table, the packet will match a route, which has a zone assigned to it.
-
Source zone
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Non-Virtual Path: Determined through the Virtual Network Interface packet was received on.
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Virtual Path: Determined through source zone field in packet flow header.
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Virtual network interface - the packet was received on at source site.
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Destination zone
- Determined through destination route lookup of packet.
Routes shared with remote sites in the SD-WAN maintain information about the destination zone, including routes learned through dynamic routing protocol (BGP, OSPF). Using this mechanism, zones gain global significance in SD-WAN network and allow end-to-end filtering within the network. The use of zones provides a network administrator an efficient way to segment network traffic based on customer, business unit, or department.
The capability of SD-WAN firewall allows the user to filter traffic between services within a single zone, or to create policies that can be applied between services in different zones, as shown in figure below. In the example below, we have Zone_A and Zone_B, each of which has a LAN Virtual network interface.
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