The diagnosis that you need depends on the issue you are experiencing so if for example users have a slow logon process you’d try and see if it’s DNS related or replication topology and so on.
Please let us know what is the problem you’re trying to solve and we’ll be glad to help you.
If instead you just want to see router graphs and so on so the <a href=”http://www.paessler.com/prtg/download”>Paessler Router Grapher</a> is a really good tool for this purpose
I talk about a lot of tools and methods in my <a href=”http://itknowledgeexchange.techtarget.com/it-trenches/”>IT-Trenches blog</a> here on ITKE. Browse through some of the articles like
<a href=”http://itknowledgeexchange.techtarget.com/it-trenches/did-you-see-this-free-wireless-lan-planning-deployment-and-management-tools/”>Did you see this? – Free Wireless LAN planning, deployment and management tools</a> – includes some wired network tools
<a href=”http://itknowledgeexchange.techtarget.com/it-trenches/simple-is-not-always-easy-snmp-for-network-management/”>Simple is not always easy – SNMP for network management</a>
<a href=”http://itknowledgeexchange.techtarget.com/it-trenches/did-you-see-this-internet-measurement-testing-tools/”>Did you see this? – Internet Measurement Testing tools</a>
<a href=”http://itknowledgeexchange.techtarget.com/it-trenches/tools-for-documentation-network-discovery-monitoring/”>Tools for documentation – Network discovery & monitoring</a>
Maybe one of these <a href=”http://itknowledgeexchange.techtarget.com/it-trenches/tag/performance/”>blogs entries</a> may be of interest also.
In the IT trenches? So am I – read my <a href=”http://itknowledgeexchange.techtarget.com/it-trenches”>IT-Trenches blog</a>
Have a look at <a href=”http://www.objectplanet.com/probe/”>Network Probe</a>