Access internal IP remotely

I have twelve HP DL360 G5 servers (small animation render farm) and one of them is the main DHCP / file server. This rack is home based so FIOS home with a dynamic external IP. I use DYNDNS and it works perfect to access the DHCP server but I am wondering how do I access the other servers iLO internal ip’s to turn them on or off remotely?

Thanks!