Setting up a network with dedicated firewall in VirtualBox
I'm about to get hired on at a place for a networking gig. I'm a semi-novice when it comes to all of this (it's a campus job, so they understand i'm not a long time professional). They use Vyatta firewalls, but I could just as easily do this with ip tables and any linux distro. Anyway, what he suggested was to set up multiple VMs including one that's a dedicated firewall, and set them up on their own little network that routes through that firewall. I'm using VirtualBox; could someone give me some pointers on how to get started with this kind of setup? I'm not exactly sure where to even begin.