[CentOS] Do I need a dedicated firewall?

Hi All,

So my electricity bill is through the roof and I need to pair down some equipment.

I have a CentOS 6.5 Server (a few TB, 32gb RAM) running some simple web stuff and Zimbra. I have 5 static IP's from Comcast. I am considering giving this server a public IP and plugging it directly into my cable modem. This box can handle everything with room for me to do more.

Doing this would allow me to power down my pfSense box and additional servers by consolidating onto this single box.

I have the firewall on on the server and only allowing the few ports I need.

I dont run ssh on 22

What do you guys think?

Jason