A customer has a rack with some 1U servers and Dell™ PowerConnect™ 2716 switch at ISP's server room. One port is uplink to the ISP. Some servers run ESX5 while one 1U server is a plain Windows 2008 R2 box with 2 nics.
The switch allows me to use web based interface but there are no mrtg style graphs available to monitor bandwidth (ab)usage.
There have been 2 occasions where the whole 100Mbps that we have given by the ISP, is fully under load and we have only our gut feeling to determine if the slowness is caused by the server or the network. So far we have been solving problems with this gut feeling but before we rush to the shop buying expensive Cisco gear, I'd like to know if I could take advantage of the switch's port mirror feature and mirror the uplink port to a port in switch from which I could pull a cable to the secondary nic on the physical plain Windows box and do some network traffic analysis on that plain box (by using promiscuous mode and some software to make statistics).
What would be the software that I could use on the box in order to easily see: 1) How big the total network load is on the uplink port. 2) How it is distributed among IPs/MACs