Posts Tagged ‘LAN’

Cool Tools 25: LAN Speed Test

Saturday, March 30th, 2013

Sometimes the coolest tools are the simplest ones.

Today’s Cool Tool is simply called LAN Speed Test, and the tool pretty much does just that – it tests the speed of various connections in your LAN. It does this by simply writing a 20MB file (configurable) to a file share, reading it back, and timing how long the transfers took.


The use case for this was pretty simple: our WCI Portal machine (with an alias of PT-PORTAL) was in a DMZ, and the back-end servers (in this case, PT-INTEGRATION and PT-COLLAB) were on a separate sub-net. The NT Crawler web service was acting very strangely, failing to serve up files through the portal, but serving them up locally just fine.

So, using LAN Speed Test, I was able to confirm (and prove to the network team) that the problem was in the switch/firewall connecting the devices. Notice in the above screen shot how PT-INTEGRATION was able to write and read a 20MB file to PT-COLLAB in about .24s and .28s respectively? And how writing the same data to PT-PORTAL was taking 20.6s and 2.2s, respectively?

Yeah, there’s the smoking gun…