Learn how to configure a shared gateway for use with virtual systems.
| Where Can I Use This? | What Do I Need? |
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- NGFW (Managed by PAN-OS or Panorama)
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Perform this task if you need multiple virtual
systems to share an interface (a
Shared
Gateway) to the Internet. This task presumes:
You configured an interface
with a globally-routable IP address, which will be the shared gateway.
You completed the prior task,
Configure Virtual Systems. For the interface, you chose the
external-facing interface with the globally-routable IP address.
When configuring the virtual systems, in the Visible
Virtual System field, you checked the boxes of all virtual
systems that must communicate to be visible to each other.
Keep the following in mind while you are configuring a shared gateway.
The virtual systems in a shared gateway scenario access the Internet through
the shared gateway’s physical interface, using a single IP address. If the
IP addresses of the virtual systems are not globally routable, configure
source NAT to translate those addresses to globally-routable IP
addresses.
A virtual router routes the traffic for all of the virtual systems through
the shared gateway.
The default route for the virtual systems should point to the shared
gateway.
Security policies must be configured for each virtual system to allow the
traffic between the internal zone and external zone, which is visible to the
shared gateway.
A firewall administrator should control the virtual router, so that no member
of a virtual system can affect the traffic of other virtual systems.
Within a Palo Alto Networks firewall, a packet may hop from one virtual
system to another virtual system or a shared gateway. A packet may not
traverse more than two virtual systems or shared gateways. For example, a
packet cannot go from vsys1 to vsys2 to vsys3, or similarly from vsys1 to
vsys2 to shared gateway1. Both examples involve more than two virtual
systems, which is not permitted.
To save configuration time and effort, consider the following advantages of a shared
gateway:
Rather than configure NAT for multiple virtual systems associated with a
shared gateway, you can configure NAT for the shared gateway.
Rather than configure policy-based routing (PBR) for multiple virtual systems
associated with a shared gateway, you can configure PBR for the shared
gateway.
