That's surprising, in Denver Comcast gives my Time Capsule a /64 (and has for years, we were one of the earlier areas to get v6 service from them). Doubly surprising since the v6 RFCs all but forbid giving out less than a /64, and Comcast is a leader rather than follower of v6 technology. I wonder if the modem manufacturer is at fault instead.

I regularly ssh straight into to my suspended WoL Macbook over v6, and never went out of my way to set up a single bit of it. A half dozen new technologies working perfectly out of the box!