Clarify that IPv4 only is supported at this time

Author: cherylmc

includes/bastion-faq-include.md

@@ -5,7 +5,7 @@
  author: cherylmc
  ms.service: bastion
  ms.topic: include
- ms.date: 10/15/2019
+ ms.date: 12/17/2019
  ms.author: cherylmc
  ms.custom: include file
 ---
@@ -19,6 +19,10 @@
 
 You do NOT need a public IP on the Azure Virtual Machine that you are connecting to with the Azure Bastion service. The Bastion service will open the RDP/SSH session/connection to your virtual machine over the private IP of your virtual machine, within your virtual network.
 
+### Is IPv6 supported?
+
+At this time, IPv6 is not supported. Azure Bastion supports IPv4 only.
+
 ### <a name="rdpssh"></a>Do I need an RDP or SSH client?
 
 You do not need an RDP or SSH client to access the RDP/SSH to your Azure virtual machine in your Azure portal. Use the [Azure portal](https://portal.azure.com) to let you get RDP/SSH access to your virtual machine directly in the browser.