Network tunnel allowing IPv6 to bypass tunnel

I have created a Network Access Tunnel with the following parameters:

• Supported IP Version: IPv4
• Traffic Options: Force all traffic through tunnel
• Allow local subnet: No
• Client side security: Prevent routing changes during Network Access connection
• Client Options: Client for Microsoft network

I connect and authenticate from a browser and launch network access. I receive an internal address from my IPv4 lease pool and can access internal resources. The problem I have is that my workstation has an IPv6 stack as well and I can access any IPv6 resource on my home network at the same time.

How do I disable this split tunnel?

(Big-IP 11.4.1)

Thanks...