I described a little scenario over here: http://forum.mikrotik.com/t/network-design-feedback-plz/48436/1
Just to clarify / admit it: Yes, we are a local ISP. And yes, we have a lack of knowledge in these matters. I’m only a temporary helper, but I try to point my boss into the right directions, since he is always happy about new customers, who actually grow every day, but he doesn’t have the technical infrastructure and the human capacities to handle it.
So currently I’m trying to research what my suggestions for a improvement could be - with the help of this forums and other resources. And I’m also trying to tell my boss that he should buy proper support to evaluate my suggestion or to redesign it. But I’m too curious to find a way to solve this…and no, I’m not charging any money for my research. So please don’t blame me for counting the dollar and not just telling my boss he should get someone more professional to do it 
Since I didn’t get any response in my first topic yet, I’ll try to turn my question around:
Anyone has experience with 100mbit down / 10mbit up connection (or similar to that) or even 100mbit / 100mbit?
I’m still searching, what hardware can handle such upstream connections, if I’m working with NAT / Conn. Tracking and Firewall behind it.
We plan to connect about ~ 20 customers to one upstream connection. About 50% of those will be connected via PPPOE, the other 50% via static IP.
Most of them will be NATed, a few customers get a EoIP tunnel to deliver a public IP directly, max. 2-3 per upstream connection though.
Customers themselves will usually have between 6mbit and 16mbit downstream and 0,6 and 1,6mbit upstream.
What hardware can deal with that throughput? Right now I’m favoring x86 hardware (rack server with a small xeon and 4GB ram) + a proper l2 switch to handle the wires, since the RB1100 seems to be to small for something like that, right?
I also have some additional issue, the connecting of our infrastructure backbone which is gonna be realized with mikrotik licensed radio links 800mbit. But that’s the next step.