Merge pull request #304183 from rnautiyal/IPv6PrivateOnly

Update ipv6-application-gateway-portal.md  Private only support

Author: prmerger-automator[bot]

articles/application-gateway/ipv6-application-gateway-portal.md

@@ -102,7 +102,7 @@ Create the application gateway using the tabs on the **Create application gatewa
 1. On the **Frontends** tab, verify **Frontend IP address type** is set to **Public**.
 
    > [!IMPORTANT]
-   > For the Application Gateway v2 SKU, there must be a **Public** frontend IP configuration. A private IPv6 frontend IP configuration (Only ILB mode) is currently not supported for the IPv6 Application Gateway. 
+   > For a [private only Application Gateway](./application-gateway-private-deployment.md), you can configure private IPv6 frontend IPs, but you must also configure a private IPv4 address. In other words, a private-only Application Gateway requires both private IPv4 and private IPv6 addresses.
 
 2. Select **Add new** for the **Public IP address**, enter a name for the public IP address, and select **OK**. For example, **myAGPublicIPAddress**.