I have a CentOS machine that is being used as a PBX. One interface is going out to the local network and the other interface is currently (pending equipment arrival) plugged directly into a Metro Ethernet connection from our provider.
I would like to monitor the bandwidth going out to the internet (essentially everything entering or exiting eth1) from within the box itself, is there a very simple tool that can give me active bandwidth usage per interface?
Like that I would be able to tweak codecs and other things to get to an optimal call limit.
(any other comments about such a setup would be appreciated:) )