How to develop broadband router with Ubuntu?

Question

I wanted to develop a router from scratch in Ubuntu which will manage following things.

1. User bandwidth Management.
2. User Browsing History and Bandwidth tracking.
3. Assign HotSpot, PPPoe type of the connection.
4. Set various firewall rules.

Can you please guide me how can I do above things with Ubuntu?
I want to convert Ubuntu Server as a NAS for Broadband management and bill solutions.

Any help will be appreciated.

Answer 1

1. Traffic Control HOWTO
2. Squid Proxyserver Documentation
3. hotspot - chillispot Other hotspots
4. iptables

and you can read the Ubuntu server guide