Debian as My home firewall/router

[heqamilus <heqamilus@runbox.com>]

Hi,
I know that is possible to build a firewall using Debian.
I'm searching for some tutorials, I need to know the system's utility to 
configure  Debian installation in this way.
For example, manage network interfaces, NAT, vlan and optionally DNS

I'm able to do basic firewalling and install and use server application.

Thanks for you help
H.