I've set up a private network for the servers using secondary ethernet cards and a 10.18.0.0/24 subnet.

I'm currently using a 5 port 10/100 hub in the APC rack. All the servers have at least one spare 100 Mbps port. I'm using static /etc/hosts files. In the hosts file, all the servers that also have public IPs are spelled backwards (e.g.: PAX is XAP/10.18.0.2). The primary reason for this is to put the new CD server on the private net. It will also allow us to push other data (possibly backups or other private info) across this net without having to rely on the core switches and possible compromise there.