How do you create a front side handler which listens for both IPv4 and IPv6 traffic?
A quick way for use with initial development, would be to set '::' as the local IP address field in the front side handler. This means listen on any configured IPv4 and IPv6 address. However, be cautious as use of the "any address" is not a best practice, and should only be used during initial development.
For production environments, it is best to limit a listener to a specific interface/IP address. Another best practice is to use a host alias instead of a specific IP address. This will make deployment much easier because you will only have to change the host alias in one place instead of everywhere in the appliance that uses the specific IP address.