LongVNIT

Munin is a highly flexible and powerfull solution used to create graphs of virtually everything imaginable throughout your network, while still maintining a rattling easy of installation and configuration.
I will use the following scenario:
munin-server.example – 192.168.1.254        # Munin Server
station1.example.com – 192.168.1.1            # Munin client
station2.example.com – 192.168.1.2            # Munin client