When you say you want to monitor the traffic between them, are you primarily interested in bandwidth monitoring or are you trying to perform traffic analysis (i.e. what protocols, top applications, etc.).
If the latter, you'll need to install the Orion NetFlow Traffic Analyzer module on your Orion server and configure your routers to export NetFlow information to your Orion server. NetFlow Configurator may help you get NetFlow set up to export to your Orion server, assuming your routers support configuring NetFlow via SNMP set commands. If not, you'll need to configure NetFlow export manually on each router.
Hi yes it is the latter, as mentioned previously i have two XP virtual machines communicating with each other via frame relay. In order to use the traffic analyzer in conjunction with this can i add a third Windows Server 2008 VM with Orion installed?