So heartbeat tunnels only receive credit once in their entire lifespan? That fits in nicely with the idea of on-the-go tunnels, even casual dialup usage. But it's a bit dissapointing for those who intend to keep their tunnel up at all costs, but just don't have access to a static ip. I think more users fall into that category than in the roadwarrior-with-ipv6-needs category. The accumulation of credits is motivating =) What if such a user wants to add a second tunnel to their sixxs account? They can't save... Perhaps a 3-level system would solve this: 1) Static tunnels. Heavy penalties for ip changes, heavy penalties for downtime. Fast credit accumulation. 2) Dynamic committed tunnels. Heavy or moderate penalties for downtime, no penalties for ip changes, moderate credit accumulation. 3) Dynamic casual tunnels. No penalties for downtime, no penalties for ip changes, no or really slow credit accumulation. It sounds like a lot of administrative overhead, but when you think about it (and consider the different types of internet connections available) it's really quite logical...