As long as you are able to setup SNMP on the external server and SNMP is allowed through any firewalls between yourself and the server then you will be able to monitor it. With SNMP you can set up a chart to monitor the tx and rx of the nic in the server and have it graph out similar to MRTG.
Here's an example of a chart I have monitoring a link. I dont have a legend or toolbar present, but these can all be added by right clicking on the chart and selecting the each option to be visible. You can also select the scale of the chart aswell, from the entire time line of data to 5 seconds.
Add the external server to a map in the Dude and then create a new chart. When you add an element to the chart you should then be able to pick the nic's tx and rx from the Source pulldown menu.
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