I'm already graphing with Cacti switches and routers interfaces but sometimes should be useful to know the realtime bandwidth usage of some interfaces.
I found that tool for example:
that poll the SNMP and graph in small timeframes the usage (near real-time).
I think that this should be useful and painless as a solution that is based on NetFlow... but this is only for windows... I'm searching something for Linux.
Can someone suggest me a tool that can be suitable for me (and others ) ?