Separate WAN and LAN traffic

[tyfius]

Hello,

I could not find a similar topic which properly answered my question, hence the creation of a new one.

I completed my first Cacti installation (Ubuntu 9.10 server), added some graphs to monitor the network traffic and all is well and working as expected. I am only using the Localhost option to monitor the status on that PC.
However, I'd like to separate the traffic graphs in a WAN and LAN section. Since this server is used to host the intranet websites, version control system and performs daily backups which copy the data from the version control system to another server a lot of the traffic on the graphs are actually local network traffic and I am mostly interested in the Internet traffic.

I did not immediately found a way to create graphs which split up the local from the Internet traffic and Google has not been of much help either.
Is it simply not possible using Cacti, or did I search for the wrong terms?

Regards

[Sirup]

How many NICs does the server have?

[TheWitness]

You must be kidding! Several large ISP's depend on Cacti cause why? Cause it monitors "everything". There are no limitations other than possibly you persistence.

TheWitness