question: running virtual machines in FreeNAS

I have 9.2.1.5 installed.

I heard that you could run virtual machines in FreeNAS.

I would think that I would just run the OS in a jail.

Any information about doing this is helpful.

Edit:
I have installed centOS from the jails and have it running but I can't get apache working. The netstat command gives errors about access to TCP and UDP ports.
Edit:
I have no network access on the CentOS machine. How would I fix this.