Flow My Thoughts, The IT Professor Said

Hound of the Netville

http://www.sunbelt-software.com/product.cfm?id=925

A protocol sniffer is an essential tool for serious network administration and proactive security defence. Here is one from a well-reputed supplier at an apparently reasonable price for an enterprise product.

There are, I am sure freeware/cheap versions of this sort of tool, but the ease with which this particular example can be used and managed may in fact offset any price differential in a short time.