Merge pull request #73988 from jaredr80/patch-35

add NAT exhaustion note

Author: PRMerger9

articles/expressroute/expressroute-circuit-peerings.md

@@ -53,6 +53,10 @@ See the [FAQ page](expressroute-faqs.md) for more information on services suppor
 
 ### <a name="publicpeering"></a>Azure public peering (deprecated for new circuits)
 
+> [!Note]
+> Azure public peering has 1 NAT IP address associated to each BGP session. For greater than 2 NAT IP addresses, please move to [Microsoft peering](https://docs.microsoft.com/en-us/azure/expressroute/how-to-move-peering), where you can configure your own NAT allocations, as well as use route filters for selective prefix advertisements. 
+>
+
 Services such as Azure Storage, SQL databases, and Websites are offered on public IP addresses. You can privately connect to services hosted on public IP addresses, including VIPs of your cloud services, through the public peering routing domain. You can connect the public peering domain to your DMZ and connect to all Azure services on their public IP addresses from your WAN without having to connect through the internet.
 
 Connectivity is always initiated from your WAN to Microsoft Azure services. Microsoft Azure services will not be able to initiate connections into your network through this routing domain. Once public peering is enabled, you can connect to all Azure services. We do not allow you to selectively pick services for which we advertise routes to.
@@ -87,4 +91,4 @@ NPM monitors the health of Azure private peering and Microsoft peering. Check ou
 * Ensure that all prerequisites are met. See [ExpressRoute prerequisites](expressroute-prerequisites.md).
 * Configure your ExpressRoute connection.
   * [Create and manage ExpressRoute circuits](expressroute-howto-circuit-portal-resource-manager.md)
-  * [Configure routing (peering) for ExpressRoute circuits](expressroute-howto-routing-portal-resource-manager.md)
+  * [Configure routing (peering) for ExpressRoute circuits](expressroute-howto-routing-portal-resource-manager.md)