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Silly question....did you enable IPv6 on the ASA interfaces and assign IPv6 addresses? Have you run a packet capture to see what is happening? Can you ping the workstations from the ASA?
I have 6rd running on my Linux server through a Comcast Business Internet connection. The first hop router, however, is a Cisco ASA. I had to put in specific rules to permit protocol 41 to be passed through the ASA. Depending on what device is per...